Hi all.

I got an exception when executing this snippet code

SPSecurity.RunWithElevatedPrivileges(delegate() { using (SPSite site = new SPSite(siteUrl.Trim())) { using (SPWeb web = site.OpenWeb()) { try { web.AllowUnsafeUpdates = true; SPUser spUser = web.AllUsers[userName];

                        if (spUser != null)
                        {
                            SPGroup spGroup = web.Groups[groupName];
                            if (spGroup != null)
                                spGroup.AddUser(spUser);
                        }
                    }
                    catch (Exception ex)
                    {
                        this.TraceData(LogLevel.Error, "Error at function Named               [AddUserToSPGroupWidget.AddUserToGroup] . With Error Message: " + ex.ToString());

                    }
                    finally
                    {
                        web.AllowUnsafeUpdates = false;
                    }
                }
            }
             });

PLease guide me. Thanks in advance.