IFileUtility.cs

public interface IFileUtility
        {
            /// <summary>
            /// Use to save file in device specific folders
            /// </summary>
            /// <param name="fileName"></param>
            /// <param name="fileStream"></param>
            /// <returns></returns>
            string SaveFile(string fileName,byte[] fileStream);

            /// <summary>
            /// Used to delete the existing file directory, before syncing the file again.
            /// </summary>
            void DeleteDirectory();

        }