I am currently working on a simple .NET user control for Umbraco, and after adding my ascx and dll files in the correct places my site produces the following error:

Error creating control (/usercontrols/PartnersForm.ascx).
Maybe file doesn't exists or the usercontrol has a cache directive, which is not allowed! See the tracestack for more information!

After browsing the properties of the ascx file from within Umbraco the following error was given.

System.Web.HttpParseException: The file '/usercontrols/Forms/PartnersForm.ascx.cs' does not exist. ---> System.Web.HttpParseException: The file '/usercontrols/Forms/PartnersForm.ascx.cs' does not exist. ---> System.Web.HttpException: The file '/usercontrols/Forms/PartnersForm.ascx.cs' does not exist. at System.Web.UI.Util.CheckVirtualFileExists(VirtualPath virtualPath) at System.Web.UI.TemplateParser.ProcessCodeFile(VirtualPath codeFileVirtualPath) at System.Web.UI.TemplateParser.ProcessMainDirectiveAttribute(String deviceName, String name, String value, IDictionary parseData) --- End of inner exception stack trace --- at System.Web.UI.TemplateParser.ProcessException(Exception ex) at System.Web.UI.TemplateParser.ParseStringInternal(String text, Encoding fileEncoding) at System.Web.UI.TemplateParser.ParseString(String text, VirtualPath virtualPath, Encoding fileEncoding) --- End of inner exception stack trace --- at System.Web.UI.TemplateParser.ParseString(String text, VirtualPath virtualPath, Encoding fileEncoding) at System.Web.UI.TemplateParser.ParseReader(StreamReader reader, VirtualPath virtualPath) at System.Web.UI.TemplateParser.ParseFile(String physicalPath, VirtualPath virtualPath) at System.Web.UI.TemplateParser.ParseInternal() at System.Web.UI.TemplateParser.Parse() at System.Web.UI.TemplateParser.Parse(ICollection referencedAssemblies, VirtualPath virtualPath) at System.Web.Compilation.BaseTemplateBuildProvider.get_CodeCompilerType() at System.Web.Compilation.BuildProvider.GetCompilerTypeFromBuildProvider(BuildProvider buildProvider) at System.Web.Compilation.BuildProvidersCompiler.ProcessBuildProviders() at System.Web.Compilation.BuildProvidersCompiler.PerformBuild() at System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath) at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.Compilation.BuildManager.GetVPathBuildResult(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.UI.TemplateControl.LoadControl(VirtualPath virtualPath) at System.Web.UI.TemplateControl.LoadControl(String virtualPath) at umbraco.developer.assemblyBrowser.Page_Load(Object sender, EventArgs e)

Rather than post my full code here I've added my ascx.cs code to this Pastebin post, omitting important strings. Can anyone shed some light on this problem? I'm running v4.0.2.1 and if I remember correctly we're running .NET 2.0 on the server.