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strbase64 = strbase64.Replace(' ', '+');
MemoryStream stream = new MemoryStream(Convert.FromBase64String(strbase64));
FileStream fs = new FileStream(strurl, FileMode.OpenOrCreate, FileAccess.Write);
byte[] b = stream.ToArray();
//byte[] b = stream.GetBuffer();
fs.Write(b, 0, b.Length);
fs.Close();