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troubleshooting Question

C# Write File larger than 64 MB to network (UNC)

Avatar of ppittle
ppittleFlag for United States of America asked on
C#Windows Server 2003ASP.NET
7 Comments1 Solution2796 ViewsLast Modified:
I have a basic File Upload web site that allows users to upload files.  The files are then written out to two separate servers.  I've been using code similar to this:

byte[] byteArrayContainingUploadedFileBinary;

File.WriteAllBytes("\\server1\FileShare\", byteArrayContainingUploadedFileBinary);
File.WriteAllBytes("\\server2\FileShare\", byteArrayContainingUploadedFileBinary);

This works fine if the user uploads a file less than 64 MB.  If the file is larger than 64 MB I receive an IOException.  Microsoft indicates this is "by design", as this error is described in the method documentation.  http://msdn.microsoft.com/en-us/library/system.io.file.writeallbytes.aspx

I also tried using FileStream, but that doesn't work.  Interestingly enough, File.WriteAllBytes uses a FileStream internally.  Even though the msdn documentation for FileStream doesn't explicitly state the same 64 MB limit when writing to a UNC location, the FileStream class still fails with files over 64mb.

Does anyone know of a good way to write a file larger than 64MB to a UNC location?



Sorry about the low points for this question.  I only have 120 left.
Avatar of algen
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