Here is a piece of code that should do it:

class Program
{
    static void Main(string[] args)
    {
        // do your stuff

        if (!WasStartedWithPause())
        {
            Console.WriteLine("Press any key to continue . . . ");
            Console.ReadKey(true);
        }
    }
}

public static bool WasStartedWithPause()
{
    // Here, I reuse my answer at http://stackoverflow.com/questions/394816/how-to-get-parent-process-in-net-in-managed-way
    Process parentProcess = ParentProcessUtilities.GetParentProcess();

    // are we started by cmd.exe ?
    if (string.Compare(parentProcess.MainModule.ModuleName, "cmd.exe", StringComparison.OrdinalIgnoreCase) != 0)
        return false;

    // get cmd.exe command line
    string cmdLine = GetProcessCommandLine(parentProcess);

    // was it started with a pause?
    return cmdLine != null & cmdLine.EndsWith("& pause\"");
}

public static string GetProcessCommandLine(Process process)
{
    if (process == null)
        throw new ArgumentNullException("process");

    // use WMI to query command line
    ManagementObjectCollection moc = new ManagementObjectSearcher("SELECT CommandLine FROM Win32_Process WHERE ProcessId=" + process.Id).Get();
    foreach (ManagementObject mo in moc)
    {
        return (string)mo.Properties["CommandLine"].Value;
    }
    return null;
}