Rename a file in C#
Take a look at System.IO.File.Move, "move" the file to a new name.
System.IO.File.Move("oldfilename", "newfilename");
System.IO.File.Move(oldNameFullPath, newNameFullPath);
In the File.Move method, this won't overwrite the file if it is already exists. And it will throw an exception.
So we need to check whether the file exists or not.
/* Delete the file if exists, else no exception thrown. */
File.Delete(newFileName); // Delete the existing file if exists
File.Move(oldFileName,newFileName); // Rename the oldFileName into newFileName
Or surround it with a try catch to avoid an exception.