How I assign a value on a control in datagridview

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I have a datagridview that has a dropdownlist and textbox. I want to assign a value to a textbox depending on the selected value of the dropdownlist. But I try this getting the error "Object reference not set to an instance of an object". I post my code here( the error is occurred on the last two line):

C#

foreach (GridViewRow gvr in cgvRequest.Rows)
        {
            //Programmatically access the CheckBox from the TemplateField

            //CheckBoxField chk = (CheckBoxField)gvr.FindControl("chkMark");
            Label lbl = (Label)gvr.FindControl("lblRequestAmount");
            
            TextBox _txtAmount = (TextBox)cgvRequest.FindControl("txtAmount");

            lbl.Text = Convert.ToString(requestinfo.ElementAt(gvr.RowIndex).AmountRequested);
            
            DropDownList ddl = new DropDownList();
            ddl = (DropDownList)cgvRequest.FindControl("ddlApprovalType");
            
            ddl.SelectedValue = "A";
            _txtAmount.Text = lbl.Text;
        }

Please help.

Posted 25-Dec-11 23:38pm

Dawit Ab

Updated 25-Dec-11 23:40pm

Karthik Harve

v2

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Karthik Harve 26-Dec-11 5:40am

[Edit] pre tags added.

2 solutions

Solution 2

Hi ,

What for that label, to which control you want to assign the data and of which control ?

Let me clarify this first, so that i can help you ?

Posted 26-Dec-11 0:15am

DKVBS

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Varun Sareen · Accepted Answer · 2011-12-26T00:11:00

Dear Dawit,

The solution might be like this:-

foreach (GridViewRow gvr in cgvRequest.Rows)
        {
            //Programmatically access the CheckBox from the TemplateField

            //CheckBoxField chk = (CheckBoxField)gvr.FindControl("chkMark");
            Label lbl = (Label)gvr.FindControl("lblRequestAmount");
            
            TextBox _txtAmount = (TextBox)gvr.FindControl("txtAmount");
 
            lbl.Text = Convert.ToString(requestinfo.ElementAt(gvr.RowIndex).AmountRequested);
            
            DropDownList ddl = new DropDownList();
            ddl = (DropDownList)gvr.FindControl("ddlApprovalType");
            
            ddl.SelectedValue = "A";
            _txtAmount.Text = lbl.Text;
        }

I have replaced the GridID [cgvRequest] by [gvr] object of foreach loop

Mark this as your answer if it helps you out.

Thanks

Varun Sareen