Asp.net: ScriptManager doesn't work

Question

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:

The control with ID '' requires a ScriptManager on the page. The ScriptManager must appear before any controls that need it.

This is my code:

 <td>School</td>
     <td>
         <asp:ScriptManager ID="ScriptManager1" runat="server" />
         <asp:DropDownList ID="SchoolRegister" runat="server" AutoPostBack="True" 
             DataSourceID="SqlDataSource1" DataTextField="SchoolName" DataValueField="ID">
         </asp:DropDownList>
         <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
             ConnectionString="<%$ ConnectionStrings:DanielConnectionString %>" 
             SelectCommand="SELECT * FROM [Schools]"></asp:SqlDataSource>
     </td>
 </tr>
 <tr>
     <td>Class</td>
     <td>
         <asp:ScriptManager ID="ScriptManager2" runat="server" />
         <asp:DropDownList ID="ClassRegister" runat="server" 
             DataSourceID="SqlDataSource2" DataTextField="ClassName" DataValueField="ID">
         </asp:DropDownList>
         <asp:SqlDataSource ID="SqlDataSource2" runat="server" 
             ConnectionString="<%$ ConnectionStrings:DanielConnectionString %>" 
             SelectCommand="SELECT * FROM [Class] WHERE ([SchoolID] = @SchoolID)">
             <SelectParameters>
                 <asp:ControlParameter ControlID="SchoolRegister" Name="SchoolID" 
                     PropertyName="SelectedValue" Type="Int32" />
             </SelectParameters>
         </asp:SqlDataSource>
     </td>
 </tr>

Thanks.

For some reason it doesnt paste me the whole code in here..I'll try to fix that . sorry — thormayer
– thormayer, Commented Dec 28, 2011 at 21:20

Garrett Vlieger · Accepted Answer · 2011-12-28 21:23:43Z

1

You have multiple ScriptManager controls on your page. You only need one, and it should be placed near the top of your page.

answered Dec 28, 2011 at 21:23

Garrett Vlieger

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2 Comments

Garrett Vlieger Over a year ago

And you removed the second ScriptManager? I feel like some code is missing from your example.

thormayer Over a year ago

Yes, I did. Should I do something else beside stick the ScriptManager code in the header?

benni_mac_b · Accepted Answer · 2011-12-28 22:37:33Z

1

Are you using master pages? You only need one script manager on the page. Add it directly after the opening body tag so it appears before all the controls that may require it.

If you add one to the master page it will work for all content pages.

edited Dec 28, 2011 at 22:37

answered Dec 28, 2011 at 21:17

benni_mac_b

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2 Comments

thormayer Over a year ago

Dont have a master page, but I tried to place it just after the body tag and remove it from the last place I've put it , and it still make me the same error

benni_mac_b Over a year ago

Are you using the ajax toolkit? You try the scriptmanager from there <ajaxToolkit:ToolkitScriptManager ID="scriptManager" runat="server" />

Tom van der Woerdt · Accepted Answer · 2011-12-30 19:40:46Z

0

I solved this problem by making a <ContentTemplate> tag.

Thanks for all the helpers :)

edited Dec 30, 2011 at 19:40

Tom van der Woerdt

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answered Dec 30, 2011 at 19:36

thormayer

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