How to return multipart HTTP response in a string format from an asp.net web service

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HTTP

Hi,

My web service accepts request as string and returns response as string. Being new to ASP.Net, please clarify my below doubts.

a) Do i need to write header information while returning response string or it will be added automatically by IIS Server.
b) How can i provide multipart response of the below format while returning response in string format.

say ex:
HTTP/1.0 200 OK
Date: Wed, 03 Mar 2004 14:45:11 GMT
Server: xxx
Connection: close
Content-Type: application/xxx-multipart
Content-Length: 6851

Content-Type: image/jpeg
Content-Length: 5123
CommandID: asset14521

<5123>
Content-Type: xxx-xml
Content-Length: 1523


Thanks,
Divya