gridview Delete confirm box in codebehind using ASP.NET

gridview Delete confirm box in codebehind using ASP.NET.

In Row_Created Event of grid view write this line of code

protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
LinkButton tmpBtn = (LinkButton)e.Row.Cells[e.Row.Cells.Count - 1].Controls[e.Row.Cells[e.Row.Cells.Count - 1].Controls.Count - 1];
if (tmpBtn != null && tmpBtn.Text != "Cancel")
tmpBtn.Attributes.Add("onclick", "javascript:if (!confirm('Are you sure you want to delete this event?')) return false;");
}
}
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
Response.Redirect("editevent.aspx?eventid=" + GridView1.DataKeys[e.NewEditIndex].Value);
}
protected string GetDate(object date)
{
if (date != DBNull.Value && date.ToString() != "")
{
return DateTime.Parse(date.ToString()).ToString("dd-MMM-yyyy");
}
else
return "";
}
}