Process with an Id of #### is not running" in Visual Studio 2013 or etc

 The error message “Process with an Id of #### is not running” in Visual Studio can be quite frustrating, but there are several steps you can take to resolve it. Here are some solutions you can try:

1. Delete the Hidden .vs Folder:

   • Close Visual Studio.
   • Navigate to the folder where your solution files are stored and delete the hidden .vs folder.
   • Restart Visual Studio.
   • Hit F5, and IIS Express should load as normal, allowing you to debug.
   • Note that this problem seems to be caused by moving a project between workstations, environments, or different versions of Visual Studio. The .vs folder may contain environment-specific information

2. Edit the Project File:

   • Open Visual Studio as an administrator.
   • Right-click your project and select “Unload Project.”
   • Again, right-click your project and choose “Edit PROJECT_NAME.csproj.”
   • Find the following code and delete it:
     XML

     <DevelopmentServerPort>63366</DevelopmentServerPort>
     <DevelopmentServerVPath>/</DevelopmentServerVPath>
     <IISUrl>http://localhost:63366/</IISUrl>
     

     .
   • Save and close the .csproj file.
   • Right-click your project and reload it1.

3. Restart IIS Express:

   • Stop the application.
   • Make sure no other ASP.NET or Web API applications are running. If they are, stop them as well.
   • Open the Run dialog by pressing Windows Key + R.
   • Type iisreset in the textbox and press OK.
   • A command prompt window might open and perform some background processing. .

4. Additional Solutions:

   • Delete the IIS folder with the following command:

     rmdir /s /q "%userprofile%\Documents\IISExpress"
     

   • Delete the .vsConfig folder in your Visual Studio instance.
   • Relaunch Visual Studio as an Administrator so that the necessary files can be rebuilt.