Changing file extention

I have to change extension of a lot of files. What is the easiest solution. Is there a property something like FileExtention that can be changed? Thanks.
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Bob LearnedCommented:
Here's one way:

using System.IO;


string sourceFile = @"c:\temp\test.xml";
string filePath = Path.GetDirectoryName(sourceFile);
string fileName = Path.GetFileNameWithoutExtension(sourceFile);
string targetFile = Path.Combine(filePath, fileName) + ".config";
File.Move(sourceFile, targetFile);


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check Path.ChangeExtension method...

        string goodFileName = @"C:\mydir\";
        string badFileName = @"C:\mydir\";
        string result;

        result = Path.ChangeExtension(goodFileName, ".old");
        Console.WriteLine("ChangeExtension({0}, '.old') returns '{1}'",
            goodFileName, result);

        result = Path.ChangeExtension(goodFileName, "");
        Console.WriteLine("ChangeExtension({0}, '') returns '{1}'",
            goodFileName, result);

        result = Path.ChangeExtension(badFileName, ".old");
        Console.WriteLine("ChangeExtension({0}, '.old') returns '{1}'",
            badFileName, result);

        // This code produces output similar to the following:
        // ChangeExtension(C:\mydir\, '.old') returns 'C:\mydir\'
        // ChangeExtension(C:\mydir\, '') returns 'C:\mydir\'
        // ChangeExtension(C:\mydir\, '.old') returns 'C:\mydir\.old'

The solution of Bob works fine. The solution of msreekm has the chance to be the shorter one but he missed that ChangeExtension only changes it in the path string, does not change the extension of the file. So I'll combine the two:

string sourceFile = @"c:\temp\test.xml";
string newExtension = "config";
File.Move(sourceFile, Path.ChangeExtension (sourceFile, newExtension));

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