Asp.net WebForm中UpdatePanel内的模板TextBox字段

Question

I have a databound gridview and I have a TextBox template field inside that

The markup look like the below

<asp:UpdatePanel ID="UpdatePanel1"   runat="server">
    <ContentTemplate>
        <asp:GridView ID="tbl_costing" runat="server" AutoGenerateColumns="False" OnRowDataBound="tbl_costing_RowDataBound" CellPadding="4" ForeColor="#333333" GridLines="None" Width="1023px" ShowHeaderWhenEmpty="True">
            <AlternatingRowStyle BackColor="White" />
            <Columns>    

                <asp:TemplateField HeaderText="Consumption" SortExpression="Consumption">
                    <ItemTemplate>
                        <asp:UpdatePanel ID="UpdatePanel3" runat="server">
                            <ContentTemplate>
                                <asp:TextBox ID="txt_consumption" runat="server" Text='<%# Bind("Consumption") %>' AutoPostBack="True" OnTextChanged="txt_consumption_TextChanged"></asp:TextBox>
                            </ContentTemplate>
                        </asp:UpdatePanel>
                        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="txt_consumption" ErrorMessage="Required" ForeColor="#CC3300">*
                        </asp:RequiredFieldValidator>                                        
                        <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="txt_consumption" ErrorMessage="Enter valid Consumption" ForeColor="Red" ValidationExpression="^[\d.]+$">*
                        </asp:RegularExpressionValidator>
                    </ItemTemplate>
                </asp:TemplateField>

            </Columns>
        </asp:GridView>
    </ContentTemplate>
</asp:UpdatePanel>

Now I need to get the row index of the Textbox on post back event I did it like this

 protected void txt_consumption_TextChanged(object sender, EventArgs e)
 {                
     try
     {
         TextBox txtcons = (TextBox)sender;
         GridViewRow currentRow = (GridViewRow)txtcons.Parent.Parent; // Error Here .....
         int rowindex = 0;
         rowindex = currentRow.RowIndex;
         calculateperdozen(currentRow);    
     }
     catch (Exception)
     {   
     }        
}

Can anyone suggest be a way to get the currentRow or rowindex ?

Answer 1

Sorry that I had not updated the solution I got for this problem till now. Let it help somebody who have the same query

I created a class which will loop trough till it reaches the Gridviewrow as naming container

 public static class ControlTreeExtensions
    {
        public static TContainer ClosestContainer<TContainer>(this Control theControl) where TContainer : Control
        {
            if (theControl == null) throw new ArgumentNullException("theControl");

            Control current = theControl.NamingContainer;
            TContainer result = current as TContainer;
            while (current != null && result == null)
            {
                current = current.NamingContainer;
                result = current as TContainer;
            }

            return result;
        }
    }

Then in my Click event or Change even I called the function

protected void txt_consumption_TextChanged(object sender, EventArgs e)
 {                
     try
     {
  TextBox txtcons = (TextBox )sender;
   GridViewRow currentRow = txtcons.ClosestContainer<GridViewRow>();

         int rowindex = 0;
         rowindex = currentRow.RowIndex;
         calculateperdozen(currentRow);    
     }
     catch (Exception)
     {   
     }        
}