保持dropdownlist选中值

   protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
     {
         int i;
 
         for (i = 0; i < GridView1.Rows.Count; i++)
         {
             if (e.Row.RowType == DataControlRowType.DataRow)
             {
                e.Row.Attributes.Add("onmouseover", "c=this.style.backgroundColor;this.style.backgroundColor='#FFFFCC'");
 
                 e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=c");
            }
         }
         e.Row.Attributes["style"] = "Cursor:hand";
        //问题分类下拉框绑定选中值
         if (((DropDownList)e.Row.FindControl("ddlProVar")) != null)
         {
             DropDownList ddlProVar = (DropDownList)e.Row.FindControl("ddlProVar");
            SetSelectedItem(ddlProVar, ((HiddenField)e.Row.FindControl("hdProVarState")).Value);
         }
 
}
   /// <summary>
     /// 保存选定的dropdownlist值
     /// </summary>
     /// <param name="list"></param>
     /// <param name="value"></param>
     private void SetSelectedItem(System.Web.UI.WebControls.ListControl list, String value)
     {
         foreach (ListItem e in list.Items)
         {
             if (e.Text == value)
             {
                 e.Selected = true;
                 return;
             }
             else e.Selected = false;
         }
     }