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    <p>Are you connecting via tcp? if so you could try using a straight socket connection with an async receive : here's some code :</p> <pre><code>class Program { static bool disc = false; static void Main(string[] args) { dbtest dt = new dbtest(); dt.Disconnected += new EventHandler(dt_Disconnected); dt.Start("10.1.32.97", 1433); while (!Console.KeyAvailable) { Console.WriteLine(disc?"disconnected":"tick"); Thread.Sleep(2000); } dt.Stop(); } static void dt_Disconnected(object sender, EventArgs e) { disc = true; Console.WriteLine("Disconnected"); } } public class dbtest { byte[] buffer = new byte[10]; Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); public event EventHandler Disconnected = null; public void Start(string host, int port) { if(s!=null) { Stop(); } s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); s.Connect(host, port); Console.WriteLine("Connected."); s.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, ReceiveCallBack, s); } public void Stop() { if (s != null) { s.Close(); s.Dispose(); s = null; } } void ReceiveCallBack(IAsyncResult ar) { Socket s = ar as Socket; if (s != null &amp;&amp; s.Connected) { int rcvd = s.EndReceive(ar); if (rcvd &gt; 0) { s.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, ReceiveCallBack, s); return; } } if(Disconnected!=null) Disconnected(this, EventArgs.Empty); } } </code></pre> <p>This is just basic - I'm not sure how long sql server will keep hold of a socket that hasn;t responded. Maybe add a count - reconnect on disconnect to see if its actually a real disconnect etc etc ...</p>
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    1. POHow to change status of label when a sql server goes down
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    1. COGreat solution...only concern would be the machine could be up but SQL Server offline or a bad connection string or no rights...seems like the only sure way to know you will have a successful connection is to test that thru SQLConnection object.
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