How to bind dropdown in Gridview throgh code behnd dynmclly?

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)

      {

           List<string> suhas = new List<string>();
                suhas.Add("suhas1");          
                suhas.Add("suhas2");         
                suhas.Add("suhas3");          
                suhas.Add("suhas4");

          if (e.Row.RowType == DataControlRowType.DataRow)

          {

             DropDownList ddl = (DropDownList)e.Row.FindControl("ddlMyCustom");

               if (ddl != null)

               {

                  ddl.DataSource = suhas;

                  ddl.DataBind();

               }

          }

       }