Convert Stream to byte array C#

ConvertImageTOByteArray.cs

   /// <summary>
   /// Convert stream to byte[]
   /// </summary>
   /// <param name="stream"></param>
   /// <returns>Byte[]</returns>
public static byte[] ReadFully(Stream input)
       {
           byte[] buffer = new byte[16 * input.Length];

           using (MemoryStream ms = new MemoryStream())
           {
               int read;
               while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
               {
                   ms.Write(buffer, 0, read);
               }
               return ms.ToArray();
           }
       }