Template TextBox feild inside UpdatePanel in Asp.net WebForm

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

the markup look like the below

ASP.NET

  <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

C#

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 current Row or row index

Posted 15-Dec-15 21:22pm

SREENATH GANGA

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2 solutions

Solution 1

Hello,

Try this
GridViewRow currentRow = (GridViewRow)txtcons.Parent.Parent.Parent.Parent;

Thanks,
Hope this helps !!!

Posted 16-Dec-15 1:47am

Member 11027181

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Richard Deeming · Accepted Answer · 2015-12-16T03:43:00

Relying on the exact structure of the markup is a very brittle approach. As soon as you touch the markup, you'll have to go back through your code to update the number of .Parent nodes you traverse.

A better approach would be to walk up the control tree, looking for a container of a specified type:

C#

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;
    }
}

You can then use this method to find the closest container of a particular type, remembering to check for null if a container of the specified type is not found:

C#

protected void txt_consumption_TextChanged(object sender, EventArgs e)
{
    TextBox txtcons = (TextBox)sender;
    GridViewRow currentRow = txtcons.ClosestContainer<GridViewRow>();
    if (currentRow != null)
    {
        calculateperdozen(currentRow);
    }
}