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Implement 3 Stacks using single array - C#

3 Stacks are Implemented in this class using 1 array.
/// 
        /// 3 Stacks are Implemented in this class using 1 array
        /// 
        public class StacksUsingSingleArray
        {
            private static int _arrSize = 99;
            private int[] _arr = new int[_arrSize];
            private int[] _stacksAvailableSlots = new int[3];
            private int _stackSize = 0;

            public StacksUsingSingleArray()
            {
                _stackSize = _arrSize / 3;
                _stacksAvailableSlots[0] = 0 * _stackSize;
                _stacksAvailableSlots[1] = 1 * _stackSize; //33
                _stacksAvailableSlots[2] = 2 * _stackSize; //66

            }

            /// 
            /// Push item on stack
            /// 
            /// stack number (ie. 0/1/2)
            /// 
            public void PushOnStack(int stackNum, int data)
            {
                _arr[_stacksAvailableSlots[stackNum]++] = data;
            }

            /// 
            /// Pop item from stack
            /// 
            /// stack number (ie. 0/1/2)
            public int PopStack(int stackNum)
            {
                return _arr[--_stacksAvailableSlots[stackNum]];
            }

            /// 
            /// Gives count of items in a stack
            /// 
            /// stack number (ie. 0/1/2)
            /// 
            public int StackCount(int stackNum)
            {
                return (_stacksAvailableSlots[stackNum] - (_stackSize * stackNum));
            }

            /// 
            /// Printing contents of stack
            /// 
            /// stack number (ie. 0/1/2)
            public void PrintStack(int stackNum)
            {
                for (int i = stackNum * _stackSize; i < _stacksAvailableSlots[stackNum]; i++)
                {
                    Console.WriteLine(_arr[i]);
                }
            }
        }
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