Getting error while finding control in Footer Row Gridview

Question

I am getting error while binding data in dropdown in gridview footer template.

Pls. help us, how to bind dropdown values inside the gridview footer template.

getting below error.

Answer 1

A GridView has one footer but the OnRowDataBound fires for every row in the GridView. Your logic is looking for the ddlCustomer in every row which is not very logical.

Use the GridView DataBound handler to get to the footer during a post back. Keep in mind, GridView handler information is openly published in the official documentation and often comes with sample code.

protected void gvcustomer_DataBound(Object sender, EventArgs e)
{ 
    // Get the footer row.
    GridViewRow footerRow = gvcustomer.FooterRow;
}

https://learn.microsoft.com/en-us/dotnet/api/system.web.ui.webcontrols.gridview.footerrow?view=netframework-4.8.1

Answer 2

Hi @Gani_tpt,

Try the following code:

 protected void OnRowDataBound(object sender, GridViewRowEventArgs e)
 {
     if (e.Row.RowType == DataControlRowType.Footer)
     {
         DropDownList DropDownList1 = (e.Row.FindControl("ddlcustomer") as DropDownList);
         List<Item> items = new List<Item>();
         items.Add(new Item() { Value= "1", Text = "USA" });
         items.Add(new Item() { Value = "2", Text = "UK" });
         items.Add(new Item() {Value = "3", Text = " AUS" });
         items.Add(new Item() {Value = "4", Text = "  OTHERS" });
         DropDownList1.DataSource = items;
         DropDownList1.DataTextField = "Text";
         DropDownList1.DataValueField = "Value";
         DropDownList1.DataBind();
         DropDownList1.Items.Insert(0, new ListItem("--Select --", "0"));
     }
 }

public class Item
{
    public Item() { }
    public string Value { set; get; }
    public string Text { set; get; }
}

Best regards,
Lan Huang

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