Comments by lapislaxuli (Top 1 by date)

DropDownList ddl;
foreach (GridViewRow gvRow in gvProf.Rows)
{
ddl = (DropDownList)(gvRow.Cells[5].FindControl("ddlDcode"));
ddl.DataSource = ds;
ddl.DataTextField = ds.Tables[0].Columns["dis_name"].ToString();
ddl.DataValueField = ds.Tables[0].Columns["dis_code"].ToString();
ddl.DataBind();
}
It is working fine