display gridview selected row value to dropdownlist in c#

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C#3.5

i want to display gridview selected row value to dropdownlist.

for that my code as follows

protected void gvFacdet_SelectedIndexChanged(object sender, EventArgs e)
   {
       txt_name.Text = gvFacdet.SelectedRow.Cells[1].Text.ToString();
       ddldesg.Items.Add(gvFacdet.SelectedRow.Cells[2].Text.ToString());
   }

In gridview row as follows

             Name                 Designation
select       Ramesh               Courseofficer

in run mode as follows

Name                textbox
Designation         dropdownlist

When i select the gridview row value that gridview selected row value to be displayed in respective textbox and dropdownlist

In textbox name to be displayed and dropdownlist designation to be displayed.

please help me what is the problem in my above code.