Check User Exist in Share point Groups

string CurrentSiteURL = "http://gildevbox3:10866/";

string currentUser="user1";

try

{

SPSecurity.RunWithElevatedPrivileges(delegate()

{

using (SPSite site = new SPSite(CurrentSiteURL))

{

using (SPWeb web = site.RootWeb)

{

SPUser user = web.EnsureUser(currentUser);

foreach(SPGroup group in web.Groups)

{

if (group.Name.ToLower() == "Study Owner".ToLower())

{

foreach (SPUser u in group.Users)

{

if (u.Name.ToLower() == user.Name.ToLower())

{

}

r

}

}

}

}

}

});

}

catch

{

}