C# : System.IO.Exception error: 'The requested operation cannot be performed on a file with a user-m

C# : System.IO.Exception error: "The requested operation cannot be performed on a file with a user-mapped section open."
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C# : System.IO.Exception error: "The requested operation cannot be performed on a file with a user-mapped section open."
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performed "The System.IO.Exception : requested user-mapped be operation on file cannot a open." error: section with C# a