This C# function helps you check if SQL Server is running fine on a particular server and port. Useful to use on app startup, or for troubleshooting firewall problems after a Windows SP2 installation.

using System.Net;
using System.Net.Sockets;

public bool CheckSQLServer(string SQLHost, int SQLPort)
{
try
{
IPHostEntry IPHost = new IPHostEntry();
IPHost = Dns.Resolve(SQLHost);

IPAddress IPAddr = IPHost.AddressList[0];

TcpClient TcpCli = new TcpClient();
TcpCli.Connect(IPAddr, SQLPort);
TcpCli.Close();

return true;
}
catch
{
return false;
}
}

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