private void Btn_Test_Click(object sender, EventArgs e)
        {
            if (!ContentSQL())
            {
                MessageBox.Show("服务器连接失败!", "服务器连接", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
            MessageBox.Show("服务器连接成功！", "服务器连接", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
        }

private bool ContentSQL()
        {
            try
            {
                _sqlClient = new TcpClient();
                var ar = _sqlClient.BeginConnect("192.168.0.1", 1433, null, null);
                ar.AsyncWaitHandle.WaitOne(500);
                return _sqlClient.Connected;
            }
            catch (Exception e)
            {
                ErrorLog.Add(e.ToString());
                MessageBox.Show(e.ToString(),"连接失败",MessageBoxButtons.OK,MessageBoxIcon.Error);
                return false;
            }
        }