Casting Back Session Variables C# Asp.net Multiple Checkbox List

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Casting Back Session Variables C# Asp.net Multiple Checkbox List

Sep 24, 2015 11:36 AM|coderPoet|LINK

So I have a search page with multiple checkboxlist, 7 in total, a button to submit the search as well as a button to toggle view of all the checkbox list search parameters.

Each checkbox list has multiple checkbox options. See procedure below to understand the flow and what I am trying to accomplish.

Pages Involved:

Page A = Search Page

Page B = Equipment Details Page

Procedure:

Users navigates to search page (Page A)
Users deselects appropriate checkboxe(s) within respective checkbox list (Check boxes are already checked upon arriving at page as set by the code "selected="True"")
User clicks search button
A list of items is displayed on the same page
user clicks particular item/part they are then forwarded to the parts detail page. (Page B)

Dilemma: When a user clicks the back button after visiting the parts details page they have to, again, deselect the checkboxe(s) they want to exclude from the search results and hit the search button again to generate the desired results.

What I would like to happen is when a user clicks the back button (this is a simple button I created with an event handler) they'll be redirected back to the search page (Page A) with their selection of checkboxes auto populated and the results shown.

I have tried to implement a solution using session variables. I believe I am saving the variables (checkboxes) inside of a session variable , correctly although it is only targeting one checkbox list at the moment.

I am unsure how to complete the solution. I understand I need to cast the list back on it self, but I am unsure how to do that and where I should place the code.

Any help is welcomed. Please treat me like a noob when explaining things as I want to be sure I gain the most knowledge from this post in hopes others will be able to use this post as a reference.

Here is a sample of 1 of the checkbox list on search page (Page A):

<asp:CheckBoxList ID="Equipment_Fields" runat="server">
                                    <asp:ListItem Text="TMS #" Selected="True" />
                                    <asp:ListItem Text="Assigned To" Selected="True" />
                                    <asp:ListItem Text="Issued To" Selected="True" />
                                    <asp:ListItem Text="Department" Selected="True" />
                                    <asp:ListItem Text="Manufacturer" Selected="True" />
                                    <asp:ListItem Text="Model #" Selected="True" />
                                    <asp:ListItem Text="Serial #" Selected="True" />
                                    <asp:ListItem Text="Description" Selected="True" />
                                    <asp:ListItem Text="Characteristics" Selected="True" />
                                    <asp:ListItem Text="Calibration Procedure" Selected="True" />
                                    <asp:ListItem Text="Calibration Standard" Selected="True" />
                                    <asp:ListItem Text="Calibration Interval" Selected="True" />
                                    <asp:ListItem Text="Required Accuracy" Selected="True" />
                                </asp:CheckBoxList>

My Code Declaring Session Variable on search page code behind (Page A) Does this look correct? It is supposed to add any checkbox which is selected to a session variable.

(There is also a bunch of other code within the submit button function which builds a query via stringbuilder, not sure if that has anything to do with what I am trying to accomplish.):

protected void Submit_Click(object sender, EventArgs e)
 {

List<string> selections = new List<string>();
    foreach (ListItem listItem in Equipment_Fields.Items)
    {
        if (listItem.Selected)
        {
            selections.Add(listItem.Value);
        }
    }

    Session["selections"] = selections;

 }

On Page B----Button Event

This is not working as when I click the button it just refreshes the current page without redirecting the user to the referring page. The prevPage function just stores the referrer url.

            if (Session["selections"] != null)
            {
                List<ListItem> name = (List<ListItem>)Session["selections"];

                foreach (ListItem li in name)
                {
                    Response.Write(li);
                }

                Response.Redirect(prevPage);
            }

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Rion William...

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Re: Casting Back Session Variables C# Asp.net Multiple Checkbox List

Sep 24, 2015 11:45 AM|Rion Williams|LINK

Since you are currently storing your collection as a List<string> in your Session, you would need to cast it the same way to retrieve it :

// Storing your Session
Session["selections"] = selections;

// Retrieving your Session
if(Session["selections"] != null)
{
     var selections = Session["selections"] as List<string>;
}

Then you could simply loop through it using a foreach loop :

foreach(var selection in selections)
{
     // Do something here.
}

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coderPoet

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24 Posts

Re: Casting Back Session Variables C# Asp.net Multiple Checkbox List

Sep 24, 2015 11:53 AM|coderPoet|LINK

Hi Rion,

Thank You for answering my post. Your feeback is greatly appreciate.

However I am unsure how to complete the solutions. Specifically for the foreach section. What should I put in this section to ensure the checkboxes are checked. Sorry I am completely new to C# and Asp.Net.

Am I supposed to do something like this.

 if (Session["selections"] != null)
        {
            var selections = Session["selections"] as List<string>;

            foreach (var selection in selections)
            {
                // Do something here.
            }
        }

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Rion William...

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Re: Casting Back Session Variables C# Asp.net Multiple Checkbox List

Sep 24, 2015 12:37 PM|Rion Williams|LINK

It depends on how you are actually wanting to output them.

Based on your previously provided logic, it looks like only the checkboxes that were actually selected are going to be stored within your Session, so you know that those will be checked. So as mentioned in your dilemma:

coderPoet
Dilemma: When a user clicks the back button after visiting the parts details page they have to, again, deselect the checkboxe(s) they want to exclude from the search results and hit the search button again to generate the desired results.

You would basically check for the Session value within your Page_Load event and iterate through your CheckBox list and check the values that were present in the Session :

if(Session["selection"] != null)
{
    // Get your selected items
    var selectedItems = Session["selection"] as List<string>;

    foreach (ListItem listItem in Equipment_Fields.Items)
    {
        // Select this item if it is present
        listItem.Selected = selectedItems.Contains(listItem.Value))
    }
}

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coderPoet

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13 Points

24 Posts

Re: Casting Back Session Variables C# Asp.net Multiple Checkbox List

Sep 24, 2015 01:26 PM|coderPoet|LINK

I added your code to the page _load event and it still isn't working. Here is the entire code behind page, just so you can see how I have it On page A: Also Should all of the code go in the code behind on Page A or am I supposed to put it in the page_load event for page B:

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Web.UI.WebControls;
using NPOI.HSSF.UserModel;
using NPOI.HSSF.Util;
using NPOI.SS.UserModel;
using Telerik.Web.UI;
using System.Data;
using System.Web.UI;

public partial class AdvancedSearch : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["selection"] != null)
        {
            // Get your selected items
            var selectedItems = Session["selection"] as List<string>;

            foreach (ListItem listItem in Equipment_Fields.Items)
            {
                // Select this item if it is present
                listItem.Selected = selectedItems.Contains(listItem.Value);
            }
        }


        if (!IsPostBack)
        {
            Master.SelItem = "Advanced Search";
            Master.SetTitle("Advanced Search");

            Results.Visible = true;
        }


    }
    protected void Submit_Click(object sender, EventArgs e)
    {
        List<string> selections = new List<string>();
        foreach (ListItem listItem in Equipment_Fields.Items)
        {
            if (listItem.Selected)
            {
                selections.Add(listItem.Value);
            }
        }

        Session["selections"] = selections;

       

        string searchValue = SearchValue.Text.Trim();
        string errorMessage = string.Empty;
        Results.Visible = false;

        bool searchEquipment = GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(Equipment_Fields) + GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(Equipment_Type) + GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(Equipment_Status) > 0;
        bool searchHistory = GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(History_Fields) + GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(History_Status) > 0;
        bool searchOTR = GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(OTR_Fields) + GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(OTR_Classification) > 0;

        if (searchEquipment == false && searchHistory == false && searchOTR == false)
        {
            errorMessage += "There's no field to be searched selected.<br/>";
        }
        if (searchEquipment)
        {
            if (GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(Equipment_Type) == 0)
            {
                errorMessage += "There's no <strong>Equipment Type</strong> to be searched selected.<br/>";
            }
            if (GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(Equipment_Status) == 0)
            {
                errorMessage += "There's no <strong>Equipment Status</strong> to be searched selected.<br/>";
            }
        }
        if (searchHistory)
        {
            if (GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(History_Status) == 0)
            {
                errorMessage += "There's no <strong>History Status</strong> to be searched selected.<br/>";
            }
        }
        if (searchOTR)
        {
            if (GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(OTR_Classification) == 0)
            {
                errorMessage += "There's no <strong>OTR Classification</strong> to be searched selected.<br/>";
            }
        }

        if (!string.IsNullOrEmpty(errorMessage))
        {
            GiTools.Telerik.RadWindow.RadError(Master.WindowManager_Error, errorMessage);

            ShowHideSearchOptions.Text = "Hide Search Options";
            Search_Options_Container.Style.Add("display", "");
        }
        else
        {
            Results.Visible = true;
            Results.Rebind();

            ShowHideSearchOptions.Text = "Show Search Options";
            Search_Options_Container.Style.Add("display", "none");
        }

        if (Filter_By_Date.Checked)
        {
            Date_Start.Enabled = Date_End.Enabled = true;
        }
        else
        {
            Date_Start.Enabled = Date_End.Enabled = false;
        }
    }

    private string GetSearchQuery()
    {
        string searchValue = SearchValue.Text.Trim();
        StringBuilder queryString = new StringBuilder();
        bool searchEquipment = GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(Equipment_Fields) + GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(Equipment_Type) + GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(Equipment_Status) > 0;
        bool searchHistory = GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(History_Fields) + GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(History_Status) > 0;
        bool searchOTR = GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(OTR_Fields) + GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(OTR_Classification) > 0;

        if (searchEquipment)
        {
            queryString.Append("SELECT equipment.equipment_id, equipment.equipment_id AS id, CAST(equipment.tms_num as varchar(30)) AS id_label, LEN(equipment.tms_num) AS id_label_length, 'Equipment' AS type, equipment.description AS description FROM equipment WHERE 1=1");

            if (!string.IsNullOrEmpty(searchValue) && GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(Equipment_Fields) > 0)
            {
                StringBuilder whereClause = new StringBuilder(" AND (1=2");
                if (Equipment_Fields.Items.FindByValue("TMS #").Selected) whereClause.Append(string.Format(" OR equipment.tms_num LIKE '{0}'", searchValue));
                if (Equipment_Fields.Items.FindByValue("Assigned To").Selected) whereClause.Append(string.Format(" OR equipment.assigned_to LIKE '{0}'", searchValue));
                if (Equipment_Fields.Items.FindByValue("Issued To").Selected) whereClause.Append(string.Format(" OR equipment.issued_to LIKE '{0}'", searchValue));
                if (Equipment_Fields.Items.FindByValue("Department").Selected) whereClause.Append(string.Format(" OR equipment.department LIKE '{0}'", searchValue));
                if (Equipment_Fields.Items.FindByValue("Manufacturer").Selected) whereClause.Append(string.Format(" OR equipment.manufacturer LIKE '{0}'", searchValue));
                if (Equipment_Fields.Items.FindByValue("Model #").Selected) whereClause.Append(string.Format(" OR equipment.model_num LIKE '{0}'", searchValue));
                if (Equipment_Fields.Items.FindByValue("Serial #").Selected) whereClause.Append(string.Format(" OR equipment.serial_num LIKE '{0}'", searchValue));
                if (Equipment_Fields.Items.FindByValue("Description").Selected) whereClause.Append(string.Format(" OR equipment.description LIKE '{0}'", searchValue));
                if (Equipment_Fields.Items.FindByValue("Characteristics").Selected) whereClause.Append(string.Format(" OR equipment.characteristics LIKE '{0}'", searchValue));
                if (Equipment_Fields.Items.FindByValue("Calibration Procedure").Selected) whereClause.Append(string.Format(" OR equipment.calibration_procedure LIKE '{0}'", searchValue));
                if (Equipment_Fields.Items.FindByValue("Calibration Standard").Selected) whereClause.Append(string.Format(" OR equipment.calibration_standard LIKE '{0}'", searchValue));
                if (Equipment_Fields.Items.FindByValue("Calibration Interval").Selected) whereClause.Append(string.Format(" OR equipment.calibration_interval LIKE '{0}'", searchValue));
                if (Equipment_Fields.Items.FindByValue("Required Accuracy").Selected) whereClause.Append(string.Format(" OR equipment.required_accuracy LIKE '{0}'", searchValue));
                whereClause.Append(")");
                queryString.Append(whereClause.ToString());
            }

            if (GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(Equipment_Type) == 1)
            {
                queryString.Append(string.Format(" AND equipment.type = {0}", Equipment_Type.SelectedValue));
            }
            if (GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(Equipment_Status) < Equipment_Status.Items.Count)
            {
                queryString.Append(string.Format(" AND equipment.status IN ({0})", string.Join(",", GiTools.UI.Controls.CheckBoxList.GetCheckedItemsValues(Equipment_Status).ToArray())));
            }
            if (!Equipment_Status_Obsolete.Items.FindByValue("Include Obsolete").Selected)
            {
                queryString.Append(" AND equipment.is_obsolete = 0");
            }

            if (Filter_By_Date.Checked)
            {
                if (Date_Start.SelectedDate.HasValue)
                {
                    queryString.Append(" AND equipment.date_submitted >= '" + Date_Start.SelectedDate.Value.Date + "'");
                }
                if (Date_End.SelectedDate.HasValue)
                {
                    queryString.Append(" AND equipment.date_submitted <= '" + Date_End.SelectedDate.Value.Date.AddDays(1).AddMilliseconds(-1) + "'");
                }
                if (Date_Start.SelectedDate.HasValue)
                {
                    queryString.Append(" AND equipment.date_submitted >= '" + Date_Start.SelectedDate.Value.Date + "'");
                }
                if (Date_End.SelectedDate.HasValue)
                {
                    queryString.Append(" AND equipment.date_submitted <= '" + Date_End.SelectedDate.Value.Date.AddDays(1).AddMilliseconds(-1) + "'");
                }
            }
        }

        if (searchHistory)
        {
            if (queryString.Length > 0)
            {
                queryString.Append(" UNION ALL ");
            }
            queryString.Append("SELECT equipment.equipment_id, history_id AS id, CAST(history_id as varchar(30)) AS id_label, LEN(history_id) AS id_label_length, 'History' AS type, 'TMS # ' + equipment.tms_num + ': ' + history.remarks AS description FROM history INNER JOIN equipment ON history.equipment_id = equipment.equipment_id WHERE 1=1");

            if (!string.IsNullOrEmpty(searchValue) && GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(History_Fields) > 0)
            {
                StringBuilder whereClause = new StringBuilder(" AND (1=2");
                if (History_Fields.Items.FindByValue("ID Number").Selected) whereClause.Append(string.Format(" OR history.history_id LIKE '{0}'", searchValue));
                if (History_Fields.Items.FindByValue("Inspector").Selected) whereClause.Append(string.Format(" OR history.inspector LIKE '{0}'", searchValue));
                if (History_Fields.Items.FindByValue("Inspector E-mail").Selected) whereClause.Append(string.Format(" OR history.inspector_email LIKE '{0}'", searchValue));
                if (History_Fields.Items.FindByValue("Remarks").Selected) whereClause.Append(string.Format(" OR history.remarks LIKE '{0}'", searchValue));
                whereClause.Append(")");
                queryString.Append(whereClause.ToString());
            }

            if (GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(History_Status) < History_Status.Items.Count)
            {
                queryString.Append(string.Format(" AND history.status IN ({0})", string.Join(",", GiTools.UI.Controls.CheckBoxList.GetCheckedItemsValues(History_Status).ToArray())));
            }

            if (Filter_By_Date.Checked)
            {
                if (Date_Start.SelectedDate.HasValue)
                {
                    queryString.Append(" AND history.date_submitted >= '" + Date_Start.SelectedDate.Value.Date + "'");
                }
                if (Date_End.SelectedDate.HasValue)
                {
                    queryString.Append(" AND history.date_submitted <= '" + Date_End.SelectedDate.Value.Date.AddDays(1).AddMilliseconds(-1) + "'");
                }
                if (Date_Start.SelectedDate.HasValue)
                {
                    queryString.Append(" AND history.date_submitted >= '" + Date_Start.SelectedDate.Value.Date + "'");
                }
                if (Date_End.SelectedDate.HasValue)
                {
                    queryString.Append(" AND history.date_submitted <= '" + Date_End.SelectedDate.Value.Date.AddDays(1).AddMilliseconds(-1) + "'");
                }
            }
        }

        if (searchOTR)
        {
            if (queryString.Length > 0)
            {
                queryString.Append(" UNION ALL ");
            }
            queryString.Append("SELECT equipment.equipment_id, otr_id AS id, CAST(otr_id as varchar(30)) AS id_label, LEN(otr_id) AS id_label_length, 'OTR' AS type, 'TMS # ' + equipment.tms_num + ': ' + otr.submitter_comments AS description FROM otr INNER JOIN equipment ON otr.equipment_id = equipment.equipment_id WHERE 1=1");

            if (!string.IsNullOrEmpty(searchValue) && GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(OTR_Fields) > 0)
            {
                StringBuilder whereClause = new StringBuilder(" AND (1=2");
                if (OTR_Fields.Items.FindByValue("ID Number").Selected) whereClause.Append(string.Format(" OR otr.otr_id LIKE '{0}'", searchValue));
                if (OTR_Fields.Items.FindByValue("Submitter").Selected) whereClause.Append(string.Format(" OR otr.submitted_by LIKE '{0}'", searchValue));
                if (OTR_Fields.Items.FindByValue("Submitter E-mail").Selected) whereClause.Append(string.Format(" OR otr.submitted_by_email LIKE '{0}'", searchValue));
                if (OTR_Fields.Items.FindByValue("Actual accuracy").Selected) whereClause.Append(string.Format(" OR otr.actual_accuracy LIKE '{0}'", searchValue));
                whereClause.Append(")");
                queryString.Append(whereClause.ToString());
            }

            if (searchOTR && GiTools.UI.Controls.CheckBoxList.GetCheckedItemsCount(OTR_Classification) == 1)
            {
                queryString.Append(string.Format(" AND otr.classification = {0}", OTR_Classification.SelectedValue));
            }

            if (Filter_By_Date.Checked)
            {
                if (Date_Start.SelectedDate.HasValue)
                {
                    queryString.Append(" AND otr.date_submitted >= '" + Date_Start.SelectedDate.Value.Date + "'");
                }
                if (Date_End.SelectedDate.HasValue)
                {
                    queryString.Append(" AND otr.date_submitted <= '" + Date_End.SelectedDate.Value.Date.AddDays(1).AddMilliseconds(-1) + "'");
                }
                if (Date_Start.SelectedDate.HasValue)
                {
                    queryString.Append(" AND otr.date_submitted >= '" + Date_Start.SelectedDate.Value.Date + "'");
                }
                if (Date_End.SelectedDate.HasValue)
                {
                    queryString.Append(" AND otr.date_submitted <= '" + Date_End.SelectedDate.Value.Date.AddDays(1).AddMilliseconds(-1) + "'");
                }
            }
        }

        queryString.Append(" ORDER BY type, id_label_length, id_label");

        return queryString.ToString();
    }

    protected void Results_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)
    {
        Results.DataSource = GiTools.Database.MsSql.SqlToDataTable(Common.ConnectionString, GetSearchQuery());
    }

    protected void Results_ItemDataBound(object sender, GridItemEventArgs e)
    {
        if (e.Item is GridPagerItem)
        {
            GridPagerItem pager = (GridPagerItem)e.Item;
            Label lbl = (Label)pager.FindControl("ChangePageSizeLabel");
            lbl.Visible = false;

            RadComboBox combo = (RadComboBox)pager.FindControl("PageSizeComboBox");
            combo.Visible = false;
        }
        if (e.Item is GridDataItem)
        {
            string type = DataBinder.Eval(e.Item.DataItem, "type", string.Empty);

            if (type == "OTR")
            {
                e.Item.Cells[2].Text = string.Format("<a href='OtrView.aspx?id={0}'>{0}</a>", DataBinder.Eval(e.Item.DataItem, "id", string.Empty));
            }
            else if (type == "History")
            {
                e.Item.Cells[2].Text = string.Format("<a href='EquipmentView.aspx?id={0}'>{1}</a>", DataBinder.Eval(e.Item.DataItem, "equipment_id", string.Empty), DataBinder.Eval(e.Item.DataItem, "id", string.Empty));
            }
            else if (type == "Equipment")
            {
                e.Item.Cells[2].Text = string.Format("<a href='EquipmentView.aspx?id={0}'>{1}</a>", DataBinder.Eval(e.Item.DataItem, "equipment_id", string.Empty), DataBinder.Eval(e.Item.DataItem, "id_label", string.Empty));
            }
        }
    }

    protected void DataDump_Click(object sender, EventArgs e)
    {
        DataClassesDataContext dc = new DataClassesDataContext();
        DataTable dt = GiTools.Database.MsSql.SqlToDataTable(Common.ConnectionString, GetSearchQuery());

        HSSFWorkbook hssfworkbook = new HSSFWorkbook();
        HSSFSheet sheet = (HSSFSheet)hssfworkbook.CreateSheet("Sheet1");

        int rowIndex = 0;
        int columnIndex = 0;

        #region add table headers

        HSSFFont boldFont = (HSSFFont)hssfworkbook.CreateFont();
        boldFont.Color = HSSFColor.BLACK.index;
        boldFont.Boldweight = (short)FontBoldWeight.BOLD;

        HSSFCellStyle header_Bold = (HSSFCellStyle)hssfworkbook.CreateCellStyle();
        header_Bold.SetFont(boldFont);

        HSSFRow dataRow = (HSSFRow)sheet.CreateRow(rowIndex);

        dataRow.CreateCell(columnIndex++).SetCellValue("ID #");
        dataRow.CreateCell(columnIndex++).SetCellValue("Type");
        dataRow.CreateCell(columnIndex++).SetCellValue("Description");

        for (int i = 0; i < sheet.GetRow(0).LastCellNum; i++)
        {
            HSSFCell cell = (HSSFCell)sheet.GetRow(0).GetCell(i);
            cell.CellStyle = header_Bold;
        }

        #endregion

        #region add data

        foreach (DataRow row in dt.Rows)
        {
            rowIndex++;
            columnIndex = 0;
            dataRow = (HSSFRow)sheet.CreateRow(rowIndex);

            dataRow.CreateCell(columnIndex++).SetCellValue(GiTools.DataTypes.String.TryParse(row[1]));
            dataRow.CreateCell(columnIndex++).SetCellValue(GiTools.DataTypes.String.TryParse(row[2]));
            dataRow.CreateCell(columnIndex++).SetCellValue(GiTools.DataTypes.String.TryParse(row[3]));
        }

        #endregion

        // autosize all columns
        for (int i = 0; i < sheet.GetRow(0).LastCellNum; i++)
        {
            if (i != 12 && i != 23)
            {
                sheet.AutoSizeColumn(i);
            }
        }

        //Write the stream data of workbook to the root directory
        string fileName = "~/Downloads/Advanced-Search-Result.xls";
        FileStream file = new FileStream(Server.MapPath(fileName), FileMode.Create);
        hssfworkbook.Write(file);
        file.Close();

        GiTools.UI.Page.DownloadFile(this, fileName, true);
    }
}

Reply

Klein Zhang

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1445 Posts

Re: Casting Back Session Variables C# Asp.net Multiple Checkbox List

Sep 29, 2015 03:35 AM|Klein Zhang|LINK

Hi coderPoet

coderPoet
if (Session["selection"] != null) { // Get your selected items var selectedItems = Session["selection"] as List<string>; foreach (ListItem listItem in Equipment_Fields.Items) { // Select this item if it is present listItem.Selected = selectedItems.Contains(listItem.Value); } }

coderPoet
protected void Submit_Click(object sender, EventArgs e) { List<string> selections = new List<string>(); foreach (ListItem listItem in Equipment_Fields.Items) { if (listItem.Selected) { selections.Add(listItem.Value); } } Session["selections"] = selections;

According to your code, I find the session name is different, so you should modify your code to ensure that the name of the session is the same.

Best Regards,

Klein zhang

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coderPoet

Member

13 Points

24 Posts

Re: Casting Back Session Variables C# Asp.net Multiple Checkbox List

Sep 29, 2015 04:39 PM|coderPoet|LINK

Thank You very much. I'm not sure how I let that slip by me. I appreciate you taking the time out to correct my error.

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coderPoet

Member

13 Points

24 Posts

Re: Casting Back Session Variables C# Asp.net Multiple Checkbox List

Sep 29, 2015 04:42 PM|coderPoet|LINK

One other question, I have about 7 checkbox list, how do I include the other 6 checkbox list inside the session variable?

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Rion William...

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Re: Casting Back Session Variables C# Asp.net Multiple Checkbox List

Sep 29, 2015 05:29 PM|Rion Williams|LINK

coderPoet

One other question, I have about 7 checkbox list, how do I include the other 6 checkbox list inside the session variable?

You could store them the same way, although the easiest way to handle this would be to use some type of Dictionary so that you could associate the appropriate ID of your CheckBoxList with the List itself :

// Build your Dictionary
Dictionary<string,CheckBoxList> checkBoxLists = new Dictionary<string,CheckBoxList>();

// Add each of your CheckBoxes along with their IDs to the Dictionary
checkBoxLists.Add(YourCheckBoxList.ClientID, YourCheckBoxList);

// Repeat for each of your CheckBoxes here

// Store the Dictionary in the Session
Session["selections"] = checkBoxLists;

Then when you return to the Page, you would likely want to do the following :

Check to ensure your Session value exists.
If it does, loop through all of your existing CheckBoxList controls on your current page.
Within the loop, if one of them exists in the Session, then check the appropriate elements

You can see an example of what this might look like below :

// Check if your Session value exists
if(Session["selections"] != null)
{
     // If it does, cast it
     var checkBoxes = Session["selections"] as Dictionary<string,CheckBoxList>;

     // If the cast was successful, iterate through all of your current CheckBoxList elements
     foreach (CheckBoxList cbl in Controls.OfType<CheckBoxList>())
     {
          // If the current check box list is in your Session, update it's checked values
          if(checkBoxes.ContainsKey(cbl.ClientID))
          {
               // It does exist, so update the items accordingly
               for(var c = 0; c < cbl.Items.Count(); c++)
               {
                    // Update this item to match the one from the Session
                    cbl.Items[c].Selected = checkBoxes[cbl.ClientID].Items[c].Selected;
               }
          }    
     }
}

Does that make sense?

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coderPoet

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13 Points

24 Posts

Re: Casting Back Session Variables C# Asp.net Multiple Checkbox List

Oct 22, 2015 09:44 AM|coderPoet|LINK

Sorry for the delayed response, it's been really busy lately. Your code makes perfect sense. I really appreciate all your help. Thank you for the programming lesson. Maybe you can help me with something else. I'll start a new thread.

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