What causes the CSC file error in C#?

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The most common cause of the CSC file error in C# is a problem with the compilation process. This error occurs when the C# compiler (csc.exe) encounters an issue during the compilation process, such as a missing reference, a syntax error or a problem with a file path. Other possible causes of the CSC file error include issues with the .NET Framework, conflicts with other software or hardware on the system, or problems with permissions or user account settings.