ASP.NET Custom Control - Unknown server tag

Question

I\'ve made a custom control that inherits from a Literal control. When I try and use my control on a page a parsing error is thrown. I\'ve added this to my web.config

<

Answer 1

I was receiving the "Unknown server tag" error for a user control that was part of my project. There was no external assembly. @citronas mentioned that "If this does not work, your control probably can't compile.", and that is also listed as the most likely cause in this troubleshooting post.

Although my control code was compiling without errors, it turned out that there were warnings that I was ignoring. My warnings were regarding a resource file that was in my control folder that was referencing another missing file. Once I addressed the warnings, then the control compiled correctly and I was able to use the control with just a Register directive and no modifications to web.config, like this:

<%@ Register TagPrefix="myPrefix" TagName="myControl" Src="~/controls/mySourceFile.ascx" %>