验证控件验证DropDownList

 

  <tr>

            < td   class ="caption td_caption">

                 免疫程序：

           </ td >

            < td   class ="txtbox td_textbox">

                 < asp : DropDownList   ID ="ddlMYCX"   runat ="server"   Width ="200px"   AutoPostBack ="true"   AppendDataBoundItems ="true"

                                                     OnSelectedIndexChanged ="ddlMYCX_SelectedIndexChanged">

                  </ asp : DropDownList >

                 < asp : CompareValidator   ID ="CompareValidator1"   runat ="server"   Display ="None"   ValidationGroup ="ValidationGroup1"

                                                     ControlToValidate ="ddlMYCX"   Operator ="NotEqual"   Type ="Integer "   ValueToCompare ="0"

                                                      ErrorMessage ="<span class='ErrorMessage'>必须输入选择“免疫程序”</span>"></ asp : CompareValidator >

                  < ajaxToolkit : ValidatorCalloutExtender   runat ="Server"   ID ="Vcompare"   TargetControlID ="CompareValidator1"

                                                     HighlightCssClass ="validatorCalloutHighlight"   />

               </ td >

  </ tr >