vs2010 updatepanel dropdownList联动问题
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div class="mian">
<div class="main_right">
<div class="main_right_title">
<div class="main_right_title_01"> 考点信息</div>
<div class="main_right_02">
<table border="0" align="center" cellpadding="10" cellspacing="1" bgcolor="#277ABC">
<tr>
<th class="style2">考试批次:</th>
<td>
<asp:DropDownList
ID="dropUnifyExamInfo" runat="server" DataTextField="unifyExamInfoName"
DataValueField="unifyExamInfoID" DataSourceID="ObjectDataSource2"
AutoPostBack="True" Height="16px" Width="150px"
onselectedindexchanged="dropUnifyExamInfo_SelectedIndexChanged" >
</asp:DropDownList>
<asp:ObjectDataSource ID="ObjectDataSource2" runat="server"
SelectMethod="GetIDName" TypeName="XPWY.BLL.unifyExamInfo"></asp:ObjectDataSource>
</td>
</tr>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="false">
<ContentTemplate>
<tr>
<th class="style2">已有考点:</th>
<td>
<asp:DropDownList ID="dropExamSite" runat="server" Height="16px" Width="150px"
AutoPostBack="True" onselectedindexchanged="dropExamSite_SelectedIndexChanged">
</asp:DropDownList>
</td>
</tr>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="dropUnifyExamInfo" EventName="SelectedIndexChanged"/>
</Triggers>
</asp:UpdatePanel>
当我选择考试批次的时候 我的已有考点的dropdownList并没有绑定相应的数据。如果用updatepanel就没有问题。