How to get process ID and deal with it using c#?

If one file is used by other process and you are trying to manipulate with it...it gives an error:-

The process cannot access the file 'abc.txt' because it is being used by another process.

In C#, How can i come to kn开发者_JS百科ow that 'abc.txt' file is used by the process Name "XYZ.exe" (or any other process)?

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