How to check if a BlobStream is valid?

there many members blobstream , i'm wondering use (if any) find out if blobstream valid.

in particular there (azure) example calls function:

        public void processimage(stream input, stream output)
        {
            int width;
            int height;
            var originalimage = new bitmap(input);

and crashes @ new bitmap(input) statement.

with invalid parameter  in system.drawing.dll.

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http://www.ransen.com cad , graphics software

blobstream seem me inherit stream.

you can use canread check validity.

http://msdn.microsoft.com/en-us/library/microsoft.windowsazure.storageclient.blobstream_members.aspx

chanmm

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chanmm

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