Image in string wandeln und zurück

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public string ImageToBase64String( Image image, ImageFormat format )
{
   MemoryStream memory = new MemoryStream();
   image.Save( memory, format );
   string base64 = Convert.ToBase64String( memory.ToArray() );
   memory.Close();

   return base64;
}

public Image ImageFromBase64String( string base64 )
{
   MemoryStream memory = new MemoryStream( Convert.FromBase64String( base64 ) );
   Image result = Image.FromStream( memory );
   memory.Close();

   return result;
}