Dbmanager \ form3.cs does not support code analysis or generation because it is not included in projects that support code. 0

Warning 1 file "E: \ learning content \ school courses, papers and Program projects and game development sections \ Programs + Engineering Sections \ self-made Programs \ self-made parts \ dbmanager (added code parsing) \ dbmanager \ form3.cs does not support code analysis or generation because it is not included in projects that support code.

 

 

 

 

Solution:

Choose menu> View> solution Resource Manager"
Then display the file (above the project) on the Solution Explorer panel)
Right-click the file form3.cs that is not included in the project and choose include in the project.
Or delete form3.cs.