private void SearchLog_Click(object sender, EventArgs e)
        {
            #region  指定条件搜索后台访问日志

            if (this.CheckCookie())
            {
                string sqlstring = AdminVistLogs.GetVisitLogCondition(postdatetimeStart.SelectedDate, postdatetimeEnd.SelectedDate,
                                                                      Username.Text, others.Text);

                ViewState["condition"]     = sqlstring;
                DataGrid1.CurrentPageIndex = 0;
                BindData();
            }

            #endregion
        }