private void button5_Click(object sender, EventArgs e)
        {
            string Server   = tDataIp.Text;
            string Database = tDataName.Text;
            string Uid      = tDataUid.Text;
            string Pwd      = tDataPwd.Text;

            bool isok = DbHelperSQL.ConnectionTest(Server, Database, Uid, Pwd);

            if (isok)
            {
                MessageBox.Show("数据库连接测试成功", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            else
            {
                MessageBox.Show("数据库连接测试失败", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }