My project was compiling normal, but when I changed from 32 to 64 there appeared a lot of errors. If I ignore and continue several components disappear. I'm new to C #. How can I restore the project to a previous day as I did in Delphi? Follow the image.
Thanks 
Have you developed your components in a separate class library? If yes, libraries should be set to AnyCPU, only executables should be compiled as 32 or 64 bits.
If you have not put the components into a separate library, create a new Class Library project, embed its components in it, and set the build method to AnyCPU.
To change the configuration go to the Build option - > Configuration Manager.
Theconfigurationshouldbeasdescribedbelow: 
