Web application could not be found

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C#3.0

C#

hi,


i am using vs 3.5 framework when i try to debug it giving error at first line that
"The Web application at http://enk-msos-soft3/ could not be found"

  SPSecurity.RunWithElevatedPrivileges(delegate()
{
    string site_Str = "http://enk-msos-soft3/";
    SPSite oSiteCollection = new SPSite(site_Str);
   // SPSite oSiteCollection = new SPSite("http://enk-msos-soft3/");
    SPWeb oWebsiteRoot = oSiteCollection.OpenWeb();
    oWebsiteRoot.AllowUnsafeUpdates = true;
    SPList ListCompliance = oWebsiteRoot.Lists["Employment Activity"];
    SPQuery queryfilteremp = new SPQuery();

   });

but same code working in windows application is there anything to change code in web application
Please see regarding this issue


Thanks