Now I have a new problem, that I don't know how to solve it!

I have a gridview in wich I use the paging/sorting code, and in each row I have a select column so I can retrive one of the fields.

The code that I use to do it is:

 

    Protected Sub gvSupplier_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles gvSupplier.SelectedIndexChanged
        Dim keys As DataKey
        Dim i As Integer = Me.gvSupplier.SelectedIndex

        Me.txtSupplier.Text = Trim(Me.gvSupplier.SelectedValue.ToString())

        keys = Me.gvSupplier.DataKeys(i)
        For Each d As DictionaryEntry In keys.Values
            If d.Key = "ID" Then
                Me.hfID_Supplier.Value = d.Value
            End If
        Next

        Me.gvSupplier.Visible = False
    End Sub

  The problem is that when I use the sorting, the selectindex that I retrieve is not from the sorted gridview.

How can I retrieve the right one????

Thank's

Paula 

Hi first I want say thank you for you help, I've been searching for days to assist me on doing my grid. I have 1 little issue. I keep getting this error msg

"Unable to cast object of type 'System.Data.DataView' to type 'System.Data.DataTable'. " on this line "GridViewTransHist.DataSource = SortDataTable(GridViewTransHist.DataSource, False)". What am I doing wrong?

my code below.

Partial Class _Default
    Inherits System.Web.UI.Page

    Dim sqlConn As Data.SqlClient.SqlConnection = New _
    Data.SqlClient.SqlConnection("Data Source=CCBLOANDATA\DEVELOPMENT;Initial Catalog=LoanRev;Integrated Security=True")

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        'setup transaction type dropdownlist box
        Dim cmdSqlTransType As Data.SqlClient.SqlCommand = New _
        Data.SqlClient.SqlCommand("select txn_cde, (txn_cde + ': ' + isnull(trans_function,'<Unknown description>')) as trans_function " & _
        "from v_alldaytxn group by txn_cde, trans_function order by txn_cde", sqlConn)
        sqlConn.Open()
        drpdwnTransCode.DataSource = cmdSqlTransType.ExecuteReader()
        drpdwnTransCode.DataTextField = "trans_function"
        drpdwnTransCode.DataValueField = "txn_cde"
        'dont want the DropDownList to load again

        If Not IsPostBack Then
            drpdwnTransCode.DataBind()
            drpdwnTransCode.Items.Insert(0, "ALL")

        End If
        sqlConn.Close()

    End Sub

    Protected Sub btnGetData_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnGetData.Click
        PopulateTransHistGrid()
    End Sub
    Private Sub PopulateTransHistGrid()

        Dim sqlwhere As String
        Dim gridquery As String
        If drpdwnTransCode.Text = "ALL" Then
            sqlwhere = " "
        Else
            sqlwhere = " txn_cde = " & drpdwnTransCode.Text & " AND "
        End If

        sqlwhere = sqlwhere & " txn_eff_dt <= '" & txtenddt.SelectedDateFormatted & "'" & _
        " AND txn_eff_dt >= '" & txtbegdt.SelectedDateFormatted & "'"

        gridquery = "SELECT Escr_amt, escr_res_amt, Int_amt, late_chg_amt, " & _
        "Principal, unapplied_amt, txn_cde, is_cash_trans, acct_nbr, " & _
        "cash_trans_type, trans_function, CONVERT(char(10), txn_eff_dt, 101) as txn_eff_dt, txn_amt " & _
        "FROM v_alldaytxn where " & sqlwhere & " order by txn_eff_dt desc"

        sqlConn.Open()
        Dim dsTranHist As Data.DataSet
        Dim cmdTranHist As Data.SqlClient.SqlDataAdapter
        cmdTranHist = New Data.SqlClient.SqlDataAdapter(gridquery, sqlConn)
        dsTranHist = New Data.DataSet()
        cmdTranHist.Fill(dsTranHist, "v_alldaytxn")
        Dim dataTableRowCount As Integer = GridViewTransHist.Rows.Count

        'If dataTableRowCount > 0 Then
        GridViewTransHist.DataSource = dsTranHist.Tables("v_alldaytxn").DefaultView
        GridViewTransHist.DataBind()
        sqlConn.Close()
        'End If

    End Sub

    Protected Sub GridViewTransHist_PageIndexChanging(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewPageEventArgs) Handles GridViewTransHist.PageIndexChanging

        GridViewTransHist.DataSource = SortDataTable(GridViewTransHist.DataSource, True)
        GridViewTransHist.PageIndex = e.NewPageIndex
        GridViewTransHist.DataBind()

    End Sub
    Private Property GridViewSortDirection() As String

        Get
            Return IIf(ViewState("SortDirection") = Nothing, "ASC", ViewState("SortDirection"))
        End Get

        Set(ByVal value As String)
            ViewState("SortDirection") = value
        End Set

    End Property
    Private Property GridViewSortBLOCKED EXPRESSION As String

        Get
            Return IIf(ViewState("SortExpression") = Nothing, String.Empty, ViewState("SortExpression"))
        End Get

        Set(ByVal value As String)
            ViewState("SortExpression") = value
        End Set

    End Property
    Private Function GetSortDirection() As String

        Select Case GridViewSortDirection
            Case "ASC"
                GridViewSortDirection = "DESC"
            Case "DESC"
                GridViewSortDirection = "ASC"
        End Select

        Return GridViewSortDirection

    End Function

 

    Protected Function SortDataTable(ByVal dataTable As Data.DataTable, ByVal isPageIndexChanging As Boolean) As Data.DataView

        If Not dataTable Is Nothing Then
            Dim dataView As New Data.DataView(dataTable)

            If GridViewSortExpression <> String.Empty Then
                If isPageIndexChanging Then
                    dataView.Sort = String.Format("{0} {1}", GridViewSortExpression, GridViewSortDirection)
                Else
                    dataView.Sort = String.Format("{0} {1}", GridViewSortExpression, GetSortDirection())
                End If
            End If

            Return dataView
        Else
            Return New Data.DataView()
        End If

    End Function

    Protected Sub GridViewTransHist_Sorting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewSortEventArgs) Handles GridViewTransHist.Sorting

        GridViewSortExpression = e.SortExpression
        Dim pageIndex As Integer = GridViewTransHist.PageIndex
        GridViewTransHist.DataSource = SortDataTable(GridViewTransHist.DataSource, False)
        GridViewTransHist.DataBind()
        GridViewTransHist.PageIndex = pageIndex

    End Sub
End Class

Hi, The above Paging code works fine, im using an oracle stored procedure, bidning it to a gridview.

However, i also have a 'user filter' where teh user can filter the records by entering data to filter by.

The problem is that the paging works, but when you click to see the next page, the fliter paramters are reset.

The flitering works by simply passing the values of the filter controls to the oracle stored procedure which returns data depending on those values.

Can anyone help? 

Hello captain1210

I'm not a expert, but I think that your problem is that you are using a dataset instead of a datatable.

Look at the code that I use, and it's working:

        sqlConn = New SqlConnection(...)
        Dim strsql As String = "..."

        Dim da As New SqlDataAdapter(strsql, sqlConn)
        Dim ds As New DataTable
        da.Fill(ds)

        Me.gvSign.DataSource = ds
        Me.gvSign.DataBind()

 I hope that's what you need.

Paula
 

 

• If you're using .net 2.0, go with auto-generate fields & GridView.
• I am wrapping up final functionality with it.
• It's exactly like the DataGrid, but with way less code.

Hello,
I'm also trying to implement 'custom' paging, in ASP.NET 2.0 using GridView WITHOUT using objectdatasource.
The approach oulined above is not scalable. It retrieves ALL records. Custom paging should use database stored procdure to fetch only the records of the current page.
How can that 'custom' paging be implemented (WITHOUT using objectdatasource) ?

user_one:

Hello,
I'm also trying to implement 'custom' paging, in ASP.NET 2.0 using GridView WITHOUT using objectdatasource.
The approach oulined above is not scalable. It retrieves ALL records. Custom paging should use database stored procdure to fetch only the records of the current page.
How can that 'custom' paging be implemented (WITHOUT using objectdatasource) ?

The code in this post is aimed at those who need help enabling sorting/paging without a DataSourceControl, not advanced techniques. If you're not satisfied with that, I invite you to modify the code as you are expecting it to function.

user_one:

• sp is the way to go.
• It retrieves exactly what you need because the sqlDataSource can only do simple queries (e.g. 1 table only ... LOL).
• I had to add a HyperLinkField to call custom code for a custom view, works like a charm.
• Per custom paging, check out prior reply that commences with "I think I'm almost there... I hope!"

Ryan:

• Kudos ... great thread ... found a more efficient solution thanx to you!

: )

hi!

i'm trying to make a class which will manage different pages containing diffrent gridviews. i'm using the methods described here but i have a big problem.

i can't catch the gridview events in the class, say it's PagingSorting class, i instantiate this class in the page load then i put it in a session variable and then in the post back i unbox it again. i do have methods on it that adds the handler to the  sorting event of the grid for example,  but this event is not fired, i do add the handler on both, the postback and in the first load of the page but the event doesn't get fired.

i searched a lot and i found that, if the method in which i add the handler for the gridview event was put static and inside it i do like that :

GV.sorting += delegate{ do something.....}

then the event get fired and handled but that doesn't suit me because i need the eventargs for the sorting event to take the sortexpression etc....

so when i change to GV.sorting += new Eventhandler(SortingMethod)  that doesn't work.

so i think my problem can be resumed by the fact that i need to handle an event of a web control in a page in a different class and in the same time when handling the event having access to the event args.

sorry for my english 

i hope u did understood me 

 thx in advance

hi again !

i finally i gave up i didn't find anyway to do it apart to instantiate always the class ine the pageload, that's said it works very good but i think it's not optimized because of the problem i mentioned earlier.

thx again! 

Iam trying to give access to users who are in a database table the code is working fine if i type in the right username and password. But when i type incorrect username or password iam getting an error: index out of range exception was not handled by user code. There is no row at position 0.Blow is the code which iam using for authentication and iam using OLEDB connection.

 sql query = new sql();
DataTable dt = query.queryDbReturnDt("SELECT PER_ID,VARIABLE_NAME,VARIABLE_VALUE FROM LOGIN WHERE (PER_ID='" + id + "') AND (VARIABLE_NAME='PASS')AND (VARIABLE_VALUE = '" + password + "')", ref lblerror);

if (id == dt.Rows[0]["PER_ID"].ToString() && password == dt.Rows[0]["VARIABLE_VALUE"].ToString()))
            {
          FormsAuthentication.SetAuthCookie(id, false);
                Response.Redirect(@"~/temp.aspx");
            }

What should i do now??

Thanks for the great post, saved me a ton of time.

StrongTypes:

user_one:

Hello,
I'm also trying to implement 'custom' paging, in ASP.NET 2.0 using GridView WITHOUT using objectdatasource.
The approach oulined above is not scalable. It retrieves ALL records. Custom paging should use database stored procdure to fetch only the records of the current page.
How can that 'custom' paging be implemented (WITHOUT using objectdatasource) ?

The code in this post is aimed at those who need help enabling sorting/paging without a DataSourceControl, not advanced techniques. If you're not satisfied with that, I invite you to modify the code as you are expecting it to function.

 

How would someone add something like "Showing results 1-15 of 30 results" to the top of the gv?

 

sduffy:

How would someone add something like "Showing results 1-15 of 30 results" to the top of the gv?

I did it programatically. Not sure if this is best practice or not but here's my solution:

 

<asp:Label ID="lblResults" runat="server"></asp:Label>

   

private void SetPagingDisplay(int size)
    {

        int gvPsize = gvSearchResults.PageSize;
        int curPage = gvSearchResults.PageIndex + 1;
        int resFrom = 0;
        int resTo = 0;
        if (gvPsize > 1 && curPage > 1)
        {
            resFrom = ((curPage - 1) * gvPsize) + 1;
            resTo = curPage * gvPsize;
        }
        else
        {
            resFrom = 1;
            resTo = gvPsize;
        }
        lblResults.Text = String.Format("Showing Results {0}-{1} of {2} results", resFrom.ToString(), resTo.ToString(), size.ToString());
    }

 I then just called this from inside my databind function and the sorting and paging functions.
 

I am having the same problem sorting.  I have an XML file where I read all the data into a gridview and it works great, but I want the gridview to be sorted desc. 

I am getting the following error: The GridView 'GridView1' fired event Sorting which wasn't handled.

I have sorting set to on. The user does not need to be able to sort it.  I just want it to load sorted in desc order.

 

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

FileLocation = Server.MapPath(

"NewsLettersList.xml")

If Page.IsPostBack = False Then

Dim oDs As New DataSet

oDs.ReadXml(FileLocation)

'Read XML File

Dim i As Integer = oDs.Tables.Count

GridView1.DataSource = oDs

Dim sortExpression As String = GridView1.Columns.Item(2).SortExpression 

GridView1.Sort(sortExpression, SortDirection.Descending)

GridView1.DataBind()

End If

End Sub