C#

//This will be runned in a separate thread
bool gameRunning = true;

while (gameRunning)
{
    using (new ExecutionTimer(100)) //Update the game every 100 ms
    {
       //Implement Game Logic here...
       //eg. Update World Position for Game Objects
    }
}

/// <summary>
/// This class will stop the current thread,
/// if the code within a using scope was executed faster than the
/// calculated end time provided in the constructor.
/// </summary>
public class ExecutionTimer : IDisposable
{
    /// <summary<
    /// The Calculated EndTime (DateTime.Now + ExecutionTime)
    /// </summary>
    private DateTime endTime;

    /// <summary>
    /// Returns a new instance of ExecutionTimer. This class should be used within a using scope.
    /// </summary>
    /// <param name="miliseconds">Time in Miliseconds</param>
    public ExecutionTimer(double milliseconds)
    {
        //Calculate the endtime
        this.endTime = DateTime.Now.AddMilliseconds(milliseconds);
    }

    #region IDisposable Member

    /// <summary>
    /// Dispose will be called at the end of the using scope.
    /// This Method will stop the thread until the calculated end time is reached.
    /// </summary>
    public void Dispose()
    {
        //Get the remaining time
        var remainingTime = endTime - DateTime.Now;

        //If there is time left -> Thread.Sleep
        if(remainingTime.TotalMilliseconds > 0)
            System.Threading.Thread.Sleep((int)remainingTime.TotalMilliseconds);
    }

    #endregion
}

It saying "Object refrence not set"

No error