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private void dg_Class_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
...{
         string SqlSelect = \"select dep_id,dep_name,dep_code from db_dep\";
         if(e.Item.ItemType==ListItemType.EditItem)
         ...{
                DropDownList DDLinDG = (DropDownList)(e.Item.FindControl(\"ddl_depnameInDG\"));
                DDLinDG.DataSource = NN.ds(SqlSelect).Tables[0];
                DDLinDG.DataValueField = \"dep_id\";
                DDLinDG.DataTextField = \"dep_name\";
                DDLinDG.DataBind();
                DDLinDG.Items.FindByText(Convert.ToString(DataBinder.Eval(e.Item.DataItem,\"dep_name\"))).Selected=true;
          }
}