#region 采用Socket方式，测试服务器连接 
/// <summary> 
/// 采用Socket方式，测试服务器连接 
/// </summary> 
/// <param name="host">服务器主机名或IP</param> 
/// <param name="port">端口号</param> 
/// <param name="millisecondsTimeout">等待时间：毫秒</param> 
/// <returns></returns> 
public static bool TestConnection(string host, int port, int millisecondsTimeout) 
{ 
  TcpClient client = new TcpClient(); 
  try 
  { 
   var ar = client.BeginConnect(host, port, null, null); 
   ar.AsyncWaitHandle.WaitOne(millisecondsTimeout); 
   return client.Connected; 
  } 
  catch (Exception e) 
  { 
   throw e; 
  } 
  finally 
  { 
   client.Close(); 
  } 
} 
#endregion

/// <summary> 
/// 数据库连接操作，可替换为你自己的程序 
/// </summary> 
/// <param name="ConnectionString">连接字符串</param> 
/// <returns></returns> 
private static bool TestConnection(string ConnectionString) 
{ 
  bool result = true; 
  try 
  { 
   SqlConnection m_myConnection = new SqlConnection(ConnectionString); 
   m_myConnection.Open(); 
   //数据库操作...... 
   m_myConnection.Close(); 
  } 
  catch (Exception ex) 
  { 
   System.Diagnostics.Debug.WriteLine(ex.ToString()); 
   result = false; 
  } 
  return result; 
}

private void btnSocket_Click(object sender, EventArgs e) 
{ 
  string strCon = "Data Source=192.168.24.566;Initial Catalog=qmaster;User ID=sa;password=123456"; 
  string[] s=strCon.Split(';'); 
  s = s[0].Split('='); 
  //获取IP 
  string strIP =s[1]; 
  //发送数据，判断是否连接到指定ip 
  if (TestConnection(strIP , 1433, 500)) 
  { 
   //连接成功 
   MessageBox.Show("Socket Link Succeed","连接服务器"); 
   // 数据库操作，我这里用了连接测试。可根据你的系统自行修改 
   if (TestConnection(strCon)) 
    MessageBox.Show("Sql Link Succeed","连接数据库"); 
   else 
    MessageBox.Show("Sql Link Failed", "连接数据库"); 
  } 
  else 
   MessageBox.Show("Socket Link Failed","连接服务器"); 
}