how to set the eval variable value from code behind

Question

<a href="/web-services/" rel='<%# DataBinder.GetPropertyValue(this, "Testing") %>' runat="server" id="banquet" class="tr_delay_hover color_light tt_uppercase"><%# DataBinder.GetPropertyValue(this, "Testing") %>

 

 

public string Testing { get { return "hello world!"; } }