extjs.net Combox赋值

foreach (DataRow dr in ds.Tables[0].Rows)  //遍历获取两个值
{
    Ext.Net.ListItem listItem = new Ext.Net.ListItem();         //每次创建一个Ext.Net.ListItem的对象
    listItem.Value = dr["ID"].ToString();
    listItem.Text = dr["Name"].ToString();
    drpComBox.Items.Add(listItem);
}

public void SetListValue(ComboBox p_rg, string p_value)
{
     int num = 0;
     foreach (ListItem listItem in (StateManagedCollection<ListItem>)p_rg.Items)
     {
         if (listItem.Value == p_value)
         {
              p_rg.SelectedIndex = num;
              ExtNet.AddScript(string.Format("{0}.setValue(\"{1}\");", (object)p_rg.ClientID.ToString(), (object)p_value));
              break;
          }
          ++num;
      }
}

this.drpComBox.DisplayField = "Name";
this.drpComBox.ValueField = "ID";
this.drpComBOx.StoreID = "storeStudent";

 protected void storeStudent_Refresh(object sender, StoreRefreshDataEventArgs e)
 {
     ..
     storeStudent.DataSource = ds.Tables[0];
     storeStudent.DataBind();

 }

this.drpComBox.SetValue(fenZuId);
this.drpComBox.Text = v.LeiXingMingCheng;