findcontrol property not working : The Official Microsoft ASP.NET Forums

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Hunain Hafee...

Member

238 Points

639 Posts

findcontrol property not working

Nov 11, 2012 07:56 PM|LINK

i am near to cry bcz solving this problem took my whole day ,

simply, i am trying to get status of checkbox from grid view, so i converted it into tempaltefield and in .cs code i used findcontrol property but still getting error:

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

 CheckBox chk = (CheckBox)GridViewAdminViewEmplys.SelectedRow.FindControl("chkBoxStatus");

HERE IS MY CODE :

.ASPX

<%@ Page Language="C#" MasterPageFile="~/MasterPageAdministration.master" AutoEventWireup="true" CodeFile="adminViewEmployers.aspx.cs" Inherits="adminViewEmployers" Title="Untitled Page" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
    <div class="superAdminContent">
  <h3>Employers</h3>
  <asp:TextBox ID="txtboxEmplyrName" runat="server"></asp:TextBox>
  <asp:Button ID="btnSrchEmplyrName" runat="server" Text="Search" 
   style="height: 26px" onclick="btnSrchEmplyrName_Click" />
   Or
  <asp:Button ID="btnViewAllEmplyrs" runat="server" Text="View All" 
            onclick="btnViewAllEmplyrs_Click" />      
  <asp:Button ID="btnClrScreen" runat="server" Text="Clear" />
 </div>
 <div class="superAdminGridViewContent" >
     <asp:GridView ID="GridViewAdminViewEmplys" runat="server" AllowPaging="True"
         AutoGenerateColumns="False" DataKeyNames="userid"
         DataSourceID="SqlDataSource1" AllowSorting="True" 
         OnRowCommand="GridViewAdminViewEmplys_RowCommand"  >
         <Columns>
             <asp:CommandField ShowDeleteButton="True" ShowEditButton="True" />
             <asp:HyperLinkField DataNavigateUrlFields="userid" 
                 DataNavigateUrlFormatString="~/adminViewEmplyrFurther.aspx?userid={0}" 
                 DataTextField="userid" DataTextFormatString="{0}" HeaderText="Userid" 
                 InsertVisible="False" NavigateUrl="~/adminViewEmplyrFurther.aspx" 
                 SortExpression="userid" />
             <asp:BoundField DataField="fullname" HeaderText="fullname" 
                 SortExpression="fullname" />
             <asp:BoundField DataField="email" HeaderText="email" SortExpression="email" />
             <asp:BoundField DataField="question" HeaderText="question" 
                 SortExpression="question" />
             <asp:BoundField DataField="answers" HeaderText="answers" 
                 SortExpression="answers" />
             <asp:BoundField DataField="doc" HeaderText="doc" SortExpression="doc" />
             <asp:BoundField DataField="roleid" HeaderText="roleid" 
                 SortExpression="roleid" />
             <%--<asp:CheckBoxField DataField="active" HeaderText="Status" 
                 SortExpression="active" ReadOnly="false" />--%>
             <asp:TemplateField HeaderText="Status" >
              <ItemTemplate> 
                <asp:CheckBox ID="chkBoxStatus" runat="server" Checked='<%# Bind("active") %>' />
              </ItemTemplate>
             </asp:TemplateField>
     
         </Columns>
     </asp:GridView>
     
     <asp:GridView ID="GridView1" runat="server" AllowPaging="True" 
         AllowSorting="True" AutoGenerateColumns="False" CellPadding="4" 
         DataKeyNames="userid" DataSourceID="SqlDataSource2" ForeColor="#333333" 
         Visible="false"
         GridLines="None">
         <RowStyle BackColor="#E3EAEB" />
         <Columns>
             <asp:CommandField ShowDeleteButton="True" ShowEditButton="True" />
             <asp:HyperLinkField DataNavigateUrlFields="userid" 
                 DataNavigateUrlFormatString="~/adminViewEmplyrFurther.aspx?userid={0}" 
                 DataTextField="userid" DataTextFormatString="{0}" HeaderText="Userid" 
                 InsertVisible="False" NavigateUrl="~/adminViewEmplyrFurther.aspx" 
                 SortExpression="userid" />
             <asp:BoundField DataField="fullname" HeaderText="fullname" 
                 SortExpression="fullname" />
             <asp:BoundField DataField="email" HeaderText="email" SortExpression="email" />
             <asp:BoundField DataField="question" HeaderText="question" 
                 SortExpression="question" />
             <asp:BoundField DataField="answers" HeaderText="answers" 
                 SortExpression="answers" />
             <asp:BoundField DataField="doc" HeaderText="doc" SortExpression="doc" />
             <asp:BoundField DataField="roleid" HeaderText="roleid" 
                 SortExpression="roleid" />
         </Columns>
         <FooterStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
         <PagerStyle BackColor="#666666" ForeColor="White" HorizontalAlign="Center" />
         <SelectedRowStyle BackColor="#C5BBAF" Font-Bold="True" ForeColor="#333333" />
         <HeaderStyle BackColor="#1C5E55" Font-Bold="True" ForeColor="White" />
         <EditRowStyle BackColor="#7C6F57" />
         <AlternatingRowStyle BackColor="White" />
      
     </asp:GridView>
     <asp:SqlDataSource ID="SqlDataSource2" runat="server" 
         ConnectionString="<%$ ConnectionStrings:Waleed_orsfinalConnectionString7 %>" 
         DeleteCommand="DELETE FROM [tblUser] WHERE [userid] = @userid" 
         InsertCommand="INSERT INTO [tblUser] ([fullname], [email], [question], [answers], [doc], [roleid]) VALUES (@fullname, @email, @question, @answers, @doc, @roleid)" 
         SelectCommand="SELECT [userid], [fullname], [email], [question], [answers], [doc], [roleid] FROM [tblUser] where roleid=2" 
         UpdateCommand="UPDATE [tblUser] SET [fullname] = @fullname, [email] = @email, [question] = @question, [answers] = @answers, [doc] = @doc, [roleid] = @roleid WHERE [userid] = @userid">
         <DeleteParameters>
             <asp:Parameter Name="userid" Type="Int32" />
         </DeleteParameters>
         <UpdateParameters>
             <asp:Parameter Name="fullname" Type="String" />
             <asp:Parameter Name="email" Type="String" />
             
             <asp:Parameter Name="question" Type="String" />
             <asp:Parameter Name="answers" Type="String" />
             <asp:Parameter DbType="Date" Name="doc" />
             <asp:Parameter Name="roleid" Type="Int32" />
             <asp:Parameter Name="userid" Type="Int32" />
         </UpdateParameters>
         <InsertParameters>
             <asp:Parameter Name="fullname" Type="String" />
             <asp:Parameter Name="email" Type="String" />
             
             <asp:Parameter Name="question" Type="String" />
             <asp:Parameter Name="answers" Type="String" />
             <asp:Parameter DbType="Date" Name="doc" />
             <asp:Parameter Name="roleid" Type="Int32" />
         </InsertParameters>
     </asp:SqlDataSource>
     <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
         ConnectionString="<%$ ConnectionStrings:Waleed_orsfinalConnectionString5 %>" 
         DeleteCommand="DELETE FROM [tblUser] WHERE [userid] = @userid" 
         InsertCommand="INSERT INTO [tblUser] ([fullname], [email], [question], [answers], [doc], [roleid]) VALUES (@fullname, @email, @question, @answers, @doc, @roleid)" 
         SelectCommand="SELECT [userid], [fullname], [email], [question], [answers], [doc], [roleid],[active] FROM [tblUser] where fullname=@emplyrName AND roleid=2" 
         UpdateCommand="UPDATE [tblUser] SET [fullname] = @fullname, [email] = @email, [question] = @question, [answers] = @answers, [doc] = @doc, [roleid] = @roleid, [active]= @active WHERE [userid] = @userid">
         <DeleteParameters>
             <asp:Parameter Name="userid" Type="Int32" />
         </DeleteParameters>
         <UpdateParameters>
             <asp:Parameter Name="fullname" Type="String" />
             <asp:Parameter Name="email" Type="String" />
             <asp:Parameter Name="question" Type="String" />
             <asp:Parameter Name="answers" Type="String" />
             <asp:Parameter DbType="Date" Name="doc" />
             <asp:Parameter Name="roleid" Type="Int32" />
             <asp:Parameter Name="active" Type="Boolean" />
             <asp:Parameter Name="userid" Type="Int32" />
         </UpdateParameters>
         <InsertParameters>
             <asp:Parameter Name="fullname" Type="String" />
             <asp:Parameter Name="email" Type="String" />
             <asp:Parameter Name="question" Type="String" />
             <asp:Parameter Name="answers" Type="String" />
             <asp:Parameter DbType="Date" Name="doc" />
             <asp:Parameter Name="roleid" Type="Int32" />
             <asp:Parameter Name="active" Type="Boolean" />
         </InsertParameters>
         <SelectParameters>
             <asp:ControlParameter ControlID="txtboxEmplyrName" Name="emplyrName" Type="String" PropertyName="text" />
        </SelectParameters>
     </asp:SqlDataSource>
 </div>
</asp:Content>

.CS CODE

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;

public partial class adminViewEmployers : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

// GridViewAdminViewEmplys.Visible = false;

}

protected void GridViewAdminViewEmplys_RowCommand(Object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "Update")
{
//Response.Write("Updated");
GridViewRow gvr = GridViewAdminViewEmplys.SelectedRow;
int index = Convert.ToInt32(e.CommandArgument);
int pk = Convert.ToInt32(GridViewAdminViewEmplys.DataKeys[index].Value);
Response.Write(pk);
//bool isChecked = (GridViewAdminViewEmplys.SelectedRow.FindControl("chkBoxStatus") as CheckBox).Checked;
//Response.Write(isChecked);
CheckBox chk = (CheckBox)GridViewAdminViewEmplys.SelectedRow.FindControl("chkBoxStatus");
if (chk.Checked)
{
Response.Write("True");
}
else
{
Response.Write("False");
}
}

}
protected void btnSrchEmplyrName_Click(object sender, EventArgs e)
{
GridViewAdminViewEmplys.Visible = true;
GridView1.Visible = false;
}
protected void btnViewAllEmplyrs_Click(object sender, EventArgs e)
{
GridView1.Visible = true;
GridViewAdminViewEmplys.Visible = false;

}
}

Hunain Hafeez

Edited by Hunain Hafeez on Nov 11, 2012 07:57 PM

Reply

Alsaady

Participant

1728 Points

353 Posts

Re: findcontrol property not working

Nov 11, 2012 08:24 PM|LINK

Hunain Hafeez
i am near to cry bcz solving this problem

--------------

try to change this

GridViewRow gvr = GridViewAdminViewEmplys.SelectedRow;

to

GridView gvr = GridViewAdminViewEmplys;

and tell me if not work

.....................................

www.rtoosh.net

Edited by Alsaady on Nov 11, 2012 08:26 PM

Reply

Hunain Hafee...

Member

238 Points

639 Posts

Re: findcontrol property not working

Nov 11, 2012 08:27 PM|LINK

nope bro, it isn't working, same error

Hunain Hafeez

Edited by Hunain Hafeez on Nov 11, 2012 08:32 PM

Reply

Alsaady

Participant

1728 Points

353 Posts

Re: findcontrol property not working

Nov 11, 2012 08:56 PM|LINK

OK

check this

http://www.codeproject.com/Articles/37207/Editable-Gridview-with-Textbox-CheckBox-Radio-Butt

http://www.sitepoint.com/forums/showthread.php?606136-gridview-with-checkbox-in-edit-template

http://stackoverflow.com/questions/11490062/how-to-modify-this-checkbox-inside-the-gridview

you will find answer

.....................................

www.rtoosh.net

Marked as answer by Hunain Hafeez on Nov 11, 2012 09:23 PM

Reply

Hunain Hafee...

Member

238 Points

639 Posts

Re: findcontrol property not working

Nov 11, 2012 09:26 PM|LINK

ohh thanks man !

1st link worked !

just i modified:

CheckBox chk = (CheckBox)GridVIewAdminViewEmplys.SelectedRow.FindControl("chkBoxStatus");

to

           CheckBox chk = (CheckBox)GridVIewAdminViewEmplys.Rows[index].FindControl("chkBoxStatus");

working now! :)

Hunain Hafeez

Reply

Alsaady

Participant

1728 Points

353 Posts

Re: findcontrol property not working

Nov 11, 2012 09:28 PM|LINK

Hunain Hafeez

ohh thanks man !

1st link worked !

just i modified:

CheckBox chk = (CheckBox)GridVIewAdminViewEmplys.SelectedRow.FindControl("chkBoxStatus");

to

           CheckBox chk = (CheckBox)GridVIewAdminViewEmplys.Rows[index].FindControl("chkBoxStatus");

working now! :)

Are you cry Now.............

.....................................

www.rtoosh.net

Reply

Hunain Hafee...

Member

238 Points

639 Posts

Re: findcontrol property not working

Nov 11, 2012 09:42 PM|LINK

hahaha ! no no, not at all , i am happy now !

but i sm judt wondering that why .SelectedRow wasn't working ,

Hunain Hafeez

Edited by Hunain Hafeez on Nov 11, 2012 09:47 PM

Reply

Madhu1234

Participant

1380 Points

287 Posts

Re: findcontrol property not working

Nov 12, 2012 01:28 AM|LINK

"SelectedRow" property doesn't work in th RowCommand event becoz it doesn't know which row in curently selected in the Row_Command event. As far as I know this property only works in SelectedIndexChanged & SelectedIndexChaning events.So in order to get the index of the row in Row Command event,try use this...

protected void gvEmp_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "email")
{
int indRow = Convert.ToInt32(e.CommandArgument); //e.CommandArgument gives the index of the row.
GridViewRow gvr = gvEmp.Rows[indRow];
Response.Write(“Email sent to: “ + gvr.Cells[1].Text);
}
}

Marked as answer by Hunain Hafeez on Nov 12, 2012 09:29 AM

findcontrol property not working RSS

7 replies

Hunain Hafee...

findcontrol property not working

Object reference not set to an instance of an object.

Alsaady

Re: findcontrol property not working

Hunain Hafeez

Hunain Hafee...

Re: findcontrol property not working

Alsaady

Re: findcontrol property not working

Hunain Hafee...

Re: findcontrol property not working

Alsaady

Re: findcontrol property not working

Hunain Hafeez

Hunain Hafee...

Re: findcontrol property not working

Madhu1234

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