Find and Check/Uncheck CheckBox inside GridView RowDataBound Event

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Hello,

C#

protected void GridViewTrustee_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (Convert.ToBoolean(ds.Tables[0].Rows[0]["IsDefaultSignatory"]) == true)
    {
        CheckBox chkisdefault = (CheckBox)GridViewTrustee.FindControl("chkisdefaultsign");
        chkisdefault.Checked = true;
    }
    else if(Convert.ToBoolean(ds.Tables[0].Rows[0]["IsDefaultSignatory"]) == false)
    {
        CheckBox chkisdefault = (CheckBox)GridViewTrustee.FindControl("chkisdefaultsign");
        chkisdefault.Checked = false;
    }
    else if (Convert.ToBoolean(ds.Tables[0].Rows[0]["IsActive"]) == true)
    {
        CheckBox chkisact = (CheckBox)GridViewTrustee.FindControl("chisactive");
        chkisact.Checked = true;
    }
    else if (Convert.ToBoolean(ds.Tables[0].Rows[0]["IsActive"]) == false)
    {
        CheckBox chkisact = (CheckBox)GridViewTrustee.FindControl("chisactive");
        chkisact.Checked = false;
    }
}

I am setting the true CheckBoxes in GridView like above code but while running having.

C#

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:


Line 335:        {
Line 336:            CheckBox chkisdefault = (CheckBox)GridViewTrustee.FindControl("chkisdefaultsign");
Line 337:            chkisdefault.Checked = true;
Line 338:        }
Line 339:        else if(Convert.ToBoolean(ds.Tables[0].Rows[0]["IsDefaultSignatory"]) == false)

Posted 20-Nov-13 18:13pm

ajays3356

Updated 20-Nov-13 18:45pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

v2

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 1 · 2013-11-20T18:42:00

Solution 1

Try like below...

C#

protected void GridViewTrustee_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if(e.Row.RowType == DataControlRowType.DataRow)
    {
        if (Convert.ToBoolean(ds.Tables[0].Rows[0]["IsDefaultSignatory"]) == true)
        {
            CheckBox chkisdefault = (CheckBox)e.Row.FindControl("chkisdefaultsign");
            chkisdefault.Checked = true;
        }
        else if(Convert.ToBoolean(ds.Tables[0].Rows[0]["IsDefaultSignatory"]) == false)
        {
            CheckBox chkisdefault = (CheckBox)e.Row.FindControl("chkisdefaultsign");
            chkisdefault.Checked = false;
        }
        else if (Convert.ToBoolean(ds.Tables[0].Rows[0]["IsActive"]) == true)
        {
            CheckBox chkisact = (CheckBox)e.Row.FindControl("chisactive");
            chkisact.Checked = true;
        }
        else if (Convert.ToBoolean(ds.Tables[0].Rows[0]["IsActive"]) == false)
        {
            CheckBox chkisact = (CheckBox)e.Row.FindControl("chisactive");
            chkisact.Checked = false;
        }
    }
}

Posted 20-Nov-13 18:42pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Comments

ajays3356 21-Nov-13 0:54am

No, its not working again its showing the same error...

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 21-Nov-13 0:56am

Okay, post the GridView mark up code here.

ajays3356 21-Nov-13 0:57am

<asp:GridView ID="GridViewTrustee" runat="server" CellPadding="4" Width="100%" BackColor="White"
BorderColor="#3366CC" BorderStyle="None" BorderWidth="1px" AutoGenerateColumns="False"
DataKeyNames="EmployeeReferenceId" OnRowCommand="GridViewTrustee_RowCommand"
OnRowDeleting="DeleteRecord" OnRowDataBound="GridViewTrustee_RowDataBound">
<columns>
<asp:TemplateField HeaderText="Actions">
<itemtemplate>
<asp:LinkButton ID="lnkEdit" runat="server" Text="Edit" CommandName="edit">
<asp:LinkButton ID="lnkDelete" runat="server" Text="Delete" CommandName="Delete"
OnClientClick="return confirm('Are you sure you want to delete this event?');">

<asp:TemplateField HeaderText="Employee Id">
<itemtemplate>
<asp:Label ID="gridEmployeeId" runat="server" Text='<%# Eval("EmployeeReferenceId") %>'>

<asp:TemplateField HeaderText="Trustee Name">
<itemtemplate>
<asp:Label ID="lblTrusteeName" runat="server" Text='<%# Eval("TrusteeName") %>'>

<edititemtemplate>
<asp:TextBox ID="txtTrusteeName" runat="server">

<asp:TemplateField HeaderText="Is Default Signatory">
<itemtemplate>
<asp:CheckBox ID="chkisdefaultsign" runat="server" Enabled="false" />

<asp:TemplateField HeaderText="Description">
<itemtemplate>
<asp:Label ID="lblDescription" runat="server" Text='<%# Eval("Description") %>'>
<edititemtemplate>
<asp:TextBox ID="txtDescription" runat="server" Text='<%# Eval("Description") %>'>

<asp:TemplateField HeaderText="Is Active">
<itemtemplate>
<asp:CheckBox ID="chisactive" runat="server" Enabled="false" />

<footerstyle backcolor="#99CCCC" forecolor="#003399">
<HeaderStyle BackColor="#64B1FF" Font-Bold="True" ForeColor="#CCCCFF" />
<PagerStyle BackColor="#99CCCC" ForeColor="#003399" />
<rowstyle backcolor="White" forecolor="#003399">
<SelectedRowStyle BackColor="#009999" Font-Bold="True" ForeColor="#CCFF99" />

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 21-Nov-13 1:01am

The CheckBoxes are Enabled="false". That might be the problem. Remove this and try once.

ajays3356 21-Nov-13 1:13am

No.Not Working..Same Problem..

it shows on this line..
chkisdefault.Checked = true;

and while tracing it shows that chkisdefault is null

Can you tell me whether i am finding the control in gridview is correct or not..

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 21-Nov-13 1:17am

Okay, are you using my code? As I suggested e.Row.FindControl.... and before that checking if(e.Row.RowType == DataControlRowType.DataRow) ?

ajays3356 21-Nov-13 1:22am

Yes I am trying with your code ...but while tracing it is not even entering in the f(e.Row.RowType == DataControlRowType.DataRow) block.

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 21-Nov-13 1:24am

It will only go for DataRow. It will not go for the Header or Footer rows.
So, continue debugging, when DataRow will come, it will go inside.

ajays3356 21-Nov-13 1:29am

yeah it entered.but again chkisdefault shows null.

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 21-Nov-13 1:38am

Ok. Try like below once. If it will not work, then post the Page Load code.

CheckBox chkisdefault = e.Row.FindControl("chkisdefaultsign") as CheckBox;
chkisdefault.Checked = true;

ajays3356 21-Nov-13 2:09am

yes its working but now it shows all checkboxes checked which are even false in database.

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 21-Nov-13 2:15am

That means it is not going to the else if part for any row where you are doing checked = false. So, do one thing.

Debug and see for one row which has false in Database. Check whether it is satisfying the condition correctly or not.