when click on build in visual studio appear Error message

Question

I have asp.net MVC project when clicking on build show this message : I can't make migration because the above Error Please Help me

Mehul Prajapati · Answer

Have you tried to delete the Your_Solution_FileName.suo file? The .suo file should be in the same folder as your .sln file or in the .vs folder for newer versions of Visual Studio. The .vs folder might be hidden. The .suo file contain various information like the opened files list and some preferences that are not saved in the solution file (like the starting project) and other things. Normally you can delete the .suo file without problems. You might have to set the StartUp Project for your solution afterwards. Just to stay on the safe way you can rename the .suo file and then retry to start the solution to see if this help. In my experience sometime VS crash on start because there is an error in some source code and due to that error VS can't compile the code and then crash because without compiled code it's unable to show form in design mode. In this case deleting the .suo file will solve the situation because it reset the open files list so the solution can start up without opening/showing any files. Update Here's a list of other things you can try when deleting the .suo file doesn't resolve the issue: Restart the computer Clean Windows temp folder Clean the solution from the IDE (Menu\Build\Clean Solution) Clean the solution manually (delete the compiled DLL/EXE in the /bin/ folder and empty the temporary files that VS create during the build process in the /obj/ folder (each project that compose the solution has these folders so clean them all)) Try to open each single project that compose the solution 1-by-1 and build it to understand which is the specific project that generate the issue Understand what is the change/edit/modification that triggered the error and undo it (source control tool can help...) If you have custom controls: check the code in the constructor. The VS IDE will call the constructor of your custom controls even at design time and weird things can happen (at design time some properties dont works your connection string probably isn't populated...) As a last resort... Try to install any VS update Try to disable VS extensions (if you installed any...) Try to update any external DLL/Control referenced in your solution Try to update Windows

Abdalmajeed Alshari · Answer

Thank you My proplem is Solved by Only restart visual studio