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Hello,
I don't recommend you to use
Interop dll to work with Word documents,
especially in Asp.NET projects. It is very slow, it
requires the installation of additional packages on client machine and uses a lot of memory. If you work with the .docx format only, you may want to look at free library Open XML:
http://somecodesnippets.blogspot.ru/2012/05/how-to-create-word-document-with-c.html
http://msdn.microsoft.com/en-us/library/office/cc850841.aspx
Or you can use this
C# Word component. It
supports both .doc and .docx formats, but it is not free.