Code to add SPUser in SPGroup

Following code snippet demonstrate the way to programmatically add SPUser in SPGroup...

try
{
    SPSecurity.RunWithElevatedPrivileges(delegate()
    {
        using (SPSite spSiteTemp = new SPSite(SPContext.Current.Web.Url))
        using (SPWeb spWebTemp = spSiteTemp.OpenWeb())
        {
            spWebTemp.AllowUnsafeUpdates = true;

            SPGroup spGroup = spWebTemp.SiteGroups["MySPGroup"];

            SPUser spUser = spWebTemp.EnsureUser("DomainName\" + msUser.UserName);

            //Adding group name in temporary arraylist to check SPUser's existing group.
            ArrayList arrayListGroups = new ArrayList();
            foreach (SPGroup tempGroup in spUser.Groups)
            {
                 arrayListGroups.Add(tempGroup.Name.ToLower());
            }

            if ((spUser.Groups.Count < 1) 
               || ((spUser.Groups.Count > 1) 
                   && (!arrayListGroups.Contains("myspgroup"))))
            {
                spGroup.AddUser(spUser);
            }

            spWebTemp.AllowUnsafeUpdates = false;
        }
    });
}
catch (SPException)
{
     throw;
}