How to replace a File extension in C# ?

If you want to replace a file extension in C# , you can use the ChangeExtension method defined in the System.IO.Path class.

Below is a sample code snippet demonstrating how to do it.

How to replace a File extension in C# ?

string fileName = @"C:\test.new";
var result;
result = Path.ChangeExtension(fileName, ".old");
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