private bool RemoveUserFromGroup(string sGoupName, string sUserLoginName)
    {
        bool res = false;
        try
        {
            SPWeb web = SPContext.Current.Web;
            SPGroup oGroup = web.SiteGroups[sGoupName];
            SPUser oUser = GetSPUser(sUserLoginName);
            if (oUser != null)
            {
                web.AllowUnsafeUpdates = true;
                oGroup.RemoveUser(oUser);
                oGroup.Update();
                res = true;
                web.AllowUnsafeUpdates = false;
            }
        }
        catch (Exception ex)
        {
            string sMessage = ex.Message;
            //throw;
        }
        return res;
    }
    private bool RemoveUserFromGroup(SPGroup oGroup, SPUser oUser)
    {
        bool res = false;
        try
        {
            SPWeb web = SPContext.Current.Web;
            if (oUser != null&&oGroup!=null)
            {
                web.AllowUnsafeUpdates = true;
                oGroup.RemoveUser(oUser);
                oGroup.Update();
                res = true;
                web.AllowUnsafeUpdates = false;
            }
        }
        catch (Exception ex)
        {
            string sMessage = ex.Message;
            //throw;
        }
        return res;
    }
    private SPUser GetSPUser(string sLoginName)
    {
        SPUser oUser = null;
        try
        {
            if (!string.IsNullOrEmpty(sLoginName))
            {
                oUser = SPContext.Current.Web.EnsureUser(sLoginName);
            }
        }
        catch (Exception ex)
        {
            string sMessage = ex.Message;
        }
        return oUser;
    }

    private void RemoveUser(string sLoginName)
    {
        SPUser oUser = GetSPUser(sLoginName);
        if (oUser!=null)
        {
            SPGroupCollection groups = oUser.Groups;
            if (groups!=null&&groups.Count>0)
            {
                foreach (SPGroup g in groups)
                {
                    RemoveUserFromGroup(g, oUser);
                }
            }
        }
    }


    private bool AddUserIntoGroup(string sGroupName, string sUserLoginName)
    {
        bool res = false;
        try
        {
            SPWeb web = SPContext.Current.Web;
            web.AllowUnsafeUpdates = true;
            SPGroup oGroup = web.SiteGroups[sGroupName];
            SPUser oUser = GetSPUser(sUserLoginName);
            if (oUser != null)
            {
                oGroup.AddUser(oUser);
                oGroup.Update();

                res = true;
            }
            web.AllowUnsafeUpdates = false;
        }
        catch (Exception ex)
        {
            string sMessage = ex.Message;
            //throw;
        }
        return res;
    }

    private string FilterSPUserString(string str)
    {
        if (string.IsNullOrEmpty(str))
        {
            return str;
        }
        if (str.IndexOf(";#") > 0)
        {
            str = str.Substring(str.LastIndexOf(";#") + 2);
        }
        return str;
    }


    private bool CreateSiteGroup(string sGroupName, string sGroupDescription)
    {
        bool res = false;
        using (SPWeb oWebsiteRoot = SPContext.Current.Site.RootWeb)
        {
            oWebsiteRoot.AllowUnsafeUpdates = true;
            SPGroupCollection collGroups = oWebsiteRoot.SiteGroups;
            string sLoginName = SPContext.Current.Web.CurrentUser.LoginName;
            SPUser oUser = oWebsiteRoot.Users[sLoginName];
            SPMember oMember = oWebsiteRoot.Users[sLoginName];
            collGroups.Add(sGroupName, oMember, oUser, "Description");
            oWebsiteRoot.AllowUnsafeUpdates = false;
            res = true;
        }
        return res;
    }
    /// <summary>
    /// 给组赋权限
    /// </summary>
    /// <param name="sGroupName"></param>
    /// <param name="sPermissionLever"></param>
    /// <returns></returns>
    private bool SetGroupPermission(string sGroupName, string sPermissionLever)
    {
        bool res = false;
        using (SPWeb oWebsiteRoot = SPContext.Current.Site.RootWeb)
        {
            oWebsiteRoot.AllowUnsafeUpdates = true;
            SPRoleAssignment roleAssignment = new SPRoleAssignment(oWebsiteRoot.SiteGroups[sGroupName]);
            roleAssignment.RoleDefinitionBindings.Add(oWebsiteRoot.RoleDefinitions[sPermissionLever]);
            oWebsiteRoot.Update();
            oWebsiteRoot.AllowUnsafeUpdates = false;
            res = true;
        }
        return res;
    }

    private void DeleteSiteGroup(SPWeb web, string groupName)
    {
        web.AllowUnsafeUpdates = true;
        SPGroupCollection groups = web.SiteGroups;
        groups.Remove(groupName);
        web.Update();
        web.AllowUnsafeUpdates = false;
    }