自定义asp.net2.0权限提供程序SqlMembershipProvider

                    SqlCommand    cmd     = new SqlCommand("aspnet_Membership_GetNumberOfUsersOnline", holder.Connection);
                    SqlParameter  p       = new SqlParameter("@ReturnValue", SqlDbType.Int);

                    cmd.CommandTimeout = CommandTimeout;
                    cmd.CommandType = CommandType.StoredProcedure;
                    cmd.Parameters.Add(CreateInputParam("@ApplicationName", SqlDbType.NVarChar, ApplicationName));
                    cmd.Parameters.Add(CreateInputParam("@MinutesSinceLastInActive", SqlDbType.Int, Membership.UserIsOnlineTimeWindow));
                    cmd.Parameters.Add(CreateInputParam("@CurrentTimeUtc", SqlDbType.DateTime, DateTime.UtcNow));
                    p.Direction = ParameterDirection.ReturnValue;
                    cmd.Parameters.Add(p);
                    cmd.ExecuteNonQuery();
                    int num = ((p.Value!=null) ? ((int) p.Value) : -1);
                    return num;
                }
                finally
                {
                    if( holder != null )
                    {
                        holder.Close();