C#. NET Frequently asked Questions (FAQ)-What to do if the program does not contain a static "Main" method appropriate for the entry point

As shown, the general program last run well, and no matter you copy and paste the simple program also appears this error.

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Click on the right side of the show all the files, the following list of all CS files, right click to include in the project, the file is green, and then run. But there is a problem with this approach, you have to re-include the other when you run other files, but also to remove this inclusion, In summary, you can only include one CS file at a time, or an error.

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C#. NET Frequently asked Questions (FAQ)-What to do if the program does not contain a static "Main" method appropriate for the entry point