outlook email attach files not opening

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C#

ASP.NET

SQL

I had developed one web form at the end user can attach multiple files and submit the form.

It works fine If I run my web form from Microsoft Visual Studio 2005, I can attach multiple different files e.g. .PDF, .DOCX, .TXT, .Xls

When I run web form from SQL server2008 r2 it is not working. It can attach only one file not multiple and When you try to open one attach file (.PDF) in outlook it gives following error
“It was sent as an email attachment and wasn’t correctly decoded”.

When I attach .docx OR .Xls file and Try to open it. It opens but somehow content was erase, it just show blank word file though in email you can see the File size(240, KB).

It works fine in Microsoft Visual Studio 2005. I can attach multiple files and can see the contents of all the files.

Is there any server setting problem in SQL Server 2008 R2….?