


The type or namespace name 'Places' could not be found (are you missing a using directive or an assembly reference?).C# asp.net - The type or namespace name 'Helper' could not be found (are you missing a using directive or an assembly reference?).The type or namespace name 'DropCreateDatabaseIfModelChanges' could not be found (are you missing a using directive or an assembly reference?).The type or namespace name 'ReportingServiceSoapClient' could not be found.c# Error 1 The type or namespace name '' could not be found (are you missing a using directive or an assembly reference?).The type or namespace name 'Resource' could not be found.(C#) Type or namespace list could not be found while using.Net Core: Type or namespace name 'GlobalFilterCollection' could not be found.C# ArgumentNullException type or namespace could not be found.Type or namespace "Android" could not be found.Build error : The type or namespace name 'TweetSharp' could not be found.The type or namespace name 'Skeleton' could not be found.The type or namespace name 'SendGridClient' could not be found in Azure function.The type or namespace name 'MySqlConnection' could not be found (are you missing a using directive or an assembly reference?).The type or namespace IJSObjectReference could not be found.Type or namespace name TSocket could not be found apache thrift C# Visual Studio 2019.Error CS0246 The type or namespace name 'JsonDeserializer' could not be found (RestSharp v107).Type or namespace could not be found 'Form1'.The type or namespace name 'ClaimsAuthenticationManager' could not be found.The type or namespace name 'Windows' could not be found.The type or namespace name 'ServiceController' could not be found (are you missing a using directive or an assembly reference?).The type or namespace name could not be found keyedcollection.The type or namespace name 'IPAddress' could not be found.Type or namespace name Oracle could not found Missing Directive.The type or namespace name 'HttpResponseMessage' could not be found.The type or namespace name 'NativeShare' could not be found (are you missing a using directive or an assembly reference?).Disable "The publisher could not be verified" while tarting.The type or namespace name 'ApplicationUser' could not be found.type or namespace name '.' could not be found (are you missing a using directive or an assembly reference?).Error in C#: The type or namespace 'SmptMailMessage' could not be found.To read more about App_Code folder in the different project types see this blog If you converted a Web Site to a Web Application, see the guidelines on the Net for this-not in the scope of this question.
#APPCODE FOLDER IN ASP.NET CODE#
Put the code files in a folder with a different name. By changing Build Action from Content to Compile, you resolve the namespace issue on your development environment by forcing immediate compilation, but you get trouble when the second compilation results in objects defined twice errors on deployment. This folder is compiled when published (deployed) to the server. In the MVC or Web Application project, the App_Code folder is trouble because it has Web Site Project type semantics. However because of problems, I had to change the name of folder-see below. After I changed Build Action Property of the *.cs source file to Compile from Content the namespace was resolved in other folder locations of the project. In this case Visual Studio 2012 defaulted the Build Action to Content, even though the type was. VS defaulted the name space to MyProjectName.App_Code. I ignorantly added an App_Code folder to my MVC project from the Solution Explorer. Note that for a Web Application Project or MVC project, adding an App_Code folder to your project and putting *.cs files in it will cause problems. Note that the App_Code folder is intended for use in Web Site Projects. From the Solution Explorer right click on the source file and choose Property.

Perhaps the problem will be solved by changing the Build Action Property of the *.cs source file to Compile from Content.
