sharathg.satya -10 Posting Whiz in Training

help me in using ajax controls in C#.net
i am using them but finally they are not getting displayed.
the watermarker is not being displayed as the default text moreover the box is empty...

here is the code

<asp:ScriptManager ID="ScriptManager1" runat="server" />
        <br />
        <br />
        <br />
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <asp:TextBoxWatermarkExtender ID="TextBoxWatermarkExtender1" runat="server" 
            TargetControlID="TextBox1" WatermarkText="helloworld">
        </asp:TextBoxWatermarkExtender>

help me please
thanks in advance.

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