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POAsp.net: ScriptManager doesn't work
 

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    <p>I'm trying to populate one dropdownlist from another dropdownlist (filter the data) I understand that I suppose to make a scriptmanager but it gives me an error:</p> <blockquote> <p>The control with ID '' requires a ScriptManager on the page. The ScriptManager must appear before any controls that need it.</p> </blockquote> <p>This is my code: </p> <pre><code> &lt;td&gt;School&lt;/td&gt; &lt;td&gt; &lt;asp:ScriptManager ID="ScriptManager1" runat="server" /&gt; &lt;asp:DropDownList ID="SchoolRegister" runat="server" AutoPostBack="True" DataSourceID="SqlDataSource1" DataTextField="SchoolName" DataValueField="ID"&gt; &lt;/asp:DropDownList&gt; &lt;asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="&lt;%$ ConnectionStrings:DanielConnectionString %&gt;" SelectCommand="SELECT * FROM [Schools]"&gt;&lt;/asp:SqlDataSource&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;Class&lt;/td&gt; &lt;td&gt; &lt;asp:ScriptManager ID="ScriptManager2" runat="server" /&gt; &lt;asp:DropDownList ID="ClassRegister" runat="server" DataSourceID="SqlDataSource2" DataTextField="ClassName" DataValueField="ID"&gt; &lt;/asp:DropDownList&gt; &lt;asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="&lt;%$ ConnectionStrings:DanielConnectionString %&gt;" SelectCommand="SELECT * FROM [Class] WHERE ([SchoolID] = @SchoolID)"&gt; &lt;SelectParameters&gt; &lt;asp:ControlParameter ControlID="SchoolRegister" Name="SchoolID" PropertyName="SelectedValue" Type="Int32" /&gt; &lt;/SelectParameters&gt; &lt;/asp:SqlDataSource&gt; &lt;/td&gt; &lt;/tr&gt; </code></pre> <p>Thanks.</p>
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