Extension Method to Rename a file in a directory

FileRenameExtensionMethod

public static class ExtensionMethod
    {
        public static void Rename(this FileInfo fileInfo, string newName)
        {
            fileInfo.MoveTo(fileInfo.Directory.FullName + "\\" + newName + fileInfo.Extension);
        }
    }
    //Caller
    FileInfo file = new FileInfo("Complete_Directory_path_of_file");
    file.Rename(fName.Replace('/', '-'));