I have Converted All my JS files in GZIP files.
Not necessary. Just enable GZIP compression in IIS settings. This article gives details on how to do so. This SO discussion talks about how to validate that the settings were successfully applied.
Second thing How do i call GZIP file in My Asp.net Pages as well
Compression can be enabled for static and/or dynamic files. ASPX pages are considered a dynamic type; enabling dynamic content compression will cause them to be GZIP'd before they are served to a compatible user agent.
To validate, you can use a tool like http://gtmetrix.com/ which will warn about uncompressed resources.