Base64 Generating PDF files

My idea is to first put Base64 into MemoryStream and then save it with FileStream, but when the code is written well run to byte[] B = stream. GetBuffer (); Error in this sentence: Unable to access MemoryStream's internal buffer. Then I changed it to byte[] B = stream. ToArray (); The procedure is normal.

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 Public voidBase64stringtofile (stringStrbase64,stringstrURL) {           Try{strbase64= Strbase64. Replace (' ','+'); MemoryStream Stream=NewMemoryStream (convert.frombase64string (strbase64)); FileStream FS=NewFileStream (strURL, FileMode.OpenOrCreate, FileAccess.Write); byte[] B =Stream.               ToArray (); //byte[] B = stream. GetBuffer ();Fs. Write (b,0, b.length); Fs.           Close (); }           Catch(Exception e) {}}

Base64 Generating PDF files