Server Tags Cannot Contain Constructs?

Feb 24, 2011

I have a (image button)

<asp:ImageButton
ID="ImageButton1"
runat="server"
ImageUrl="../Images/checkout/Proceed_To_Checkout_Button.png"
onclick="top.location='<%=string.Format("MyAccount.aspx?action=new&returnUrl={0}",
Web.ProcessFlow.Common.QueryString(Request.QueryString["returnUrl"]))%>'"
/>

I get this error when I push the button:

Server tags cannot contain <% ... %> constructs.

I have tried <# too
it didn't help.

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[Code]....

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[Code]....

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