Hi, you can use following procedure to play flv file in .net
1. Open IIS Manager on the server
2. Expand the Local Computer Server.
3. Examine the 'Properties' of the local server
4. Select the MIME Types tab.
5. Click the 'New' button and enter the following:
* Associated Extension box: .FLV
* MIME Type box: flv-application/octet-stream
6. Click Ok and restart IIS. Refer the below linkhttp://weblogs.asp.net/danlewis/archive/2007/10/01/iis-6-0-and-flash-streaming-flv.aspx