public bool IsUserAuthorized(string groupName)
        {
            //Retreiving the current context
            SPSite site = SPContext.Current.Site;

            //Opening a current web and creating a instance
            using (SPWeb web = site.OpenWeb())
            {
                //Retreiving the current logged in user
                SPUser currentUser = web.CurrentUser;

                //Retrieving all the user groups in the site/web
                SPGroupCollection userGroups = currentUser.Groups;

                //Loops through the grops and check if the user is part of given group or not.
                foreach (SPGroup group in userGroups)
                {
                    //Checking the group
                    if (group.Name.Contains(groupName))
                        return true;
                }
            }
            return false;
        }