C#

public bool IsCharacter(string expression) {
  bool success = false;

  foreach(char c in expression) {
    if(Char.IsDigit(c)) {
      success = false;
      break;
    }
  }
}

public bool IsChar(string input)
{
  bool isChar = true;
  for(int loop = 0; loop < input.Length; loop++)
  {
    if((input[loop] >= 'A' && input[loop] <='Z') || (input[loop] >= 'a' && input[loop] <='z')
	|| input[loop] == ' ' || input[loop] =='.' 
	|| input[loop] == '-' || input[loop] == ',')
    {
      isChar = true;
    }
    else
    {
      isChar = false;
      // once we've found a non-char we break out of the loop
      break;
    }		
  }

  return isChar;
}

private void ConnectToServer()
{
   Socket socket = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
   socket.Connect(new IPEndPoint(Dns.Resolve(Dns.GetHostName()).AddressList[0],  20)); // 20 is the FTP command port, IIRC
   
   // Now use the SendCommand or whatever to send commands to the host.

}