Edit Row selected in gridview ,dropdown value get changed.

Question

i am editing row from gridview ,then section column value get change in Popup window ,here is image for your consideration.

 i want same value which exit in row section column ,in popup window .

here is my c# code ..for edit row

 

protected void Edit(object sender, EventArgs e)
      {
          using (GridViewRow row = (GridViewRow)((LinkButton)sender).Parent.Parent)
          {
              txtEmpID.ReadOnly = true;
              txtEmpID.Text = row.Cells[0].Text;
              txtEmpName.Text = row.Cells[1].Text;
              txtFahterName.Text = row.Cells[2].Text;
             ddlSecID.SelectedItem.Value = row.Cells[3].Text;

              popup.Show();
          }
      }