ID Already Used By Another Control

[RobHudson]

I have been using the microsoft treeview control and all of a sudden, for apparently no reason I get the following error:
The ID 'pol1x1x999999x999999' is already used by antoher control.

The error occurs on the follwoing line:
<%@ register tagprefix=&quot;mytree&quot; namespace=&quot;Microsoft.Web.UI.WebControls&quot; assembly=&quot;Microsoft.Web.UI.WebControls, Version=1.0.2.226, Culture=neutral, PublicKeyToken=31bf3856ad364e35&quot;%>

Does anybody have an idea on what this could be?

Thanks
Rob

 

[rveer]

You don't need the line

<%@ register tagprefix=&quot;mytree&quot; namespace=&quot;Microsoft.Web.UI.WebControls&quot; assembly=&quot;Microsoft.Web.UI.WebControls, Version=1.0.2.226, Culture=neutral, PublicKeyToken=31bf3856ad364e35&quot;%>

because the Microsoft.Web.UI.WebControls namespace is registered by default. Just declare a tag like
<asp:Tree id=&quot;mytree&quot; runat=&quot;server&quot;/>

(I'm not sure about the classname 'Tree', but you'll figure it out).