1private void LoadGridColumns()
2        {
3            int j = 0;
4            for (int i = 0; i < GridView1.Columns.Count; i ++ )
5            {
6                if (this.GridView1.Columns[i].HeaderText != "")
7                {
8                    System.Web.UI.WebControls.ListItem lstItem = new System.Web.UI.WebControls.ListItem();
9                    lstItem.Text = this.GridView1.Columns[i].ToString();
10                    lstItem.Value = Convert.ToString(i);
11                    this.ddlGridColumns.Items.Insert(j, lstItem);
12                    j++;
13                }
14            }
15        }