public class CStuff
	{
		private const int MIN_BALANCE = 100; 
		private readonly int MAX_BALANCE = 100000; 

		public CStuff()
		{
			//the following command causes a syntax error
			//a constant can never be changed
			//MIN_BALANCE = 90;

			//the following command does not causes a syntax error
			//a readonly variable can be changed, but only in the constructor
			MAX_BALANCE = 999999;
		}	
	}