Object Reference Error

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TextBox txt = (TextBox)GridView2.Rows [e.RowIndex].FindControl("txtQty");
        Label lbn = (Label)GridView2.Rows[e.RowIndex].FindControl("lblQty") as Label ;
       // lbn.Text = string.Empty;
        lbn.Text   =(txt.Text).ToString ();

   <asp:TemplateField>
                <EditItemTemplate>
                    <asp:TextBox ID="txtQty" runat="server"></asp:TextBox>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="lblQty" runat="server"></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>

here i am enter text box value that i am clicking update button update value i need sir

Posted 6-Sep-12 20:39pm

satheeshkumar chinnadurai

Updated 6-Sep-12 20:45pm

v2

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Aarti Meswania · Accepted Answer · 2012-09-06T20:44:00

Solution 1

TextBox txt = (TextBox)GridView2.Rows [e.RowIndex].FindControl("txtQty");

I think you have error at this line due to e.rowindex check it is out of range 0 to gridview2.rows.count-1
Happy Coding!
:)

Posted 6-Sep-12 20:44pm

Aarti Meswania

_Amy · Accepted Answer · 2012-09-06T21:04:00

Hi,
This exception comes whenever you are trying to point an object which is null. Try this:

C#

TextBox txt = (TextBox)GridView2.Rows [e.RowIndex].FindControl("txtQty");
Label lbn = (Label)GridView2.Rows[e.RowIndex].FindControl("lblQty") ;
if(txt != null && lbn != null){
    // lbn.Text = string.Empty;
    lbn.Text   =txt.Text;
}

--Amit

Member 9120792 · Accepted Answer · 2012-09-06T23:08:00

Solution 3

initialize component before use.
or Execute initialize() method of current from.
Happy Coding.:)

Posted 6-Sep-12 23:08pm

Member 9120792