private static byte[] ReadFile(string filePath)
 {
     using (FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
     {
         return fileStream.ConvertToByteArray();
     }
 }
 private static byte[] ReadFile(string fileName)
 {
     string filePath = Path.Combine(s_SharepointMock, fileName);
     using (FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
     {
         return fileStream.ConvertToByteArray();
     }
 }