You may not realize that System.IO.File.Move() doesn't support overwriting of an existing file. In fact, it will throw an IOException if a file with the same path as sourceDestFilename already exists.

As a workaround to that limitation, I wrote a simple, yet useful wrapper method below that allows for overwriting the destination file.

public static void MoveWithReplace(string sourceFileName, string destFileName)
{

    //first, delete target file if exists, as File.Move() does not support overwrite
    if (File.Exists(destFileName))
    {
        File.Delete(destFileName);
    } 

    File.Move(sourceFileName, destFileName);

}