hey all,

im making a username availability check in ASP.net using ajax updatepanel, but i keep getting the following error

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

im using the create user wizard, to create a new user but i want to check if the user already exists, i have the following code in the aspx file

<asp:UpdatePanel runat="server" ID="UserNameUP">
 <ContentTemplate>
 <asp:TextBox ID="UserName" runat="server" Width="200px" AutoPostBack="true"  OnTextChanged="Username_Changed"></asp:TextBox></ContentTemplate> </asp:UpdatePanel><br /> 

but i keep getting that error, can any one help

thanks