DropDownList的一些东东

 1.绑定

this.ddlSiteName.DataSource=dt;//数据源，DataTable
this.ddlSiteName.DataValueField="SiteID";
this.ddlSiteName.DataTextField="SiteName";
this.ddlSiteName.DataBind();

2.设置选择项的value值

this.ddlSiteName.SelectedIndex=this.ddlSiteName.Items.IndexOf(ddlSiteName.Items.FindByValue(siteID));

3.javascript获取选中值

 var ddl = document.all.ddlReceiveDept;

content += ddl.options[ddl.selectedIndex].innerText;