MatrixRotation code review - study code - No. 2

MatrixRotation_codeReview_2.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Mail;

class Solution
{
    static void Display(int[][] a)
    {
        for (int row = 0; row < a.Length; row++)
        {
            for (int column = 0; column < a[row].Length; column++)
            {
                Console.Write(a[row][column]);
                Console.Write(' ');
            }

            Console.WriteLine();
        }
    }

    static void Rotate(int[][] a, int amount)
    {
        int count = GetRingCount(a);
        for (int i = 0; i < count; i++)
        {
            Rotate(a, i, amount);
        }
    }

    static void Rotate(int[][] a, int index, int amount)
    {
        int minRow = index;
        int maxRow = a.Length - 1 - index;

        int minColumn = index;
        int maxColumn = a[0].Length - 1 - index;

        int height = maxRow - minRow + 1;
        int width = maxColumn - minColumn + 1;
        amount = amount%(2*height + 2*width - 4);

        for (int k = 0; k < amount; k++)
        {
            int i = minRow, j = minColumn;
            int buffer = a[i][j];

            do
            {
                     if (i < maxRow && j == minColumn) i++;
                else if (i == maxRow && j < maxColumn) j++;
                else if (i > minRow && j == maxColumn) i--;
                else if (i == minRow && j > minColumn) j--;

                int buffer1 = a[i][j];
                a[i][j] = buffer;
                buffer = buffer1;

            } while (!(i == minRow && j == minColumn));
        }
    }

    static int GetRingCount(int[][] a)
    {
        int rows = a.Length;
        int columns = a[0].Length;
        return Math.Min(rows, columns) / 2;
    }



    static void Main(String[] args)
    {
        
        var firstLine = Console.ReadLine().Split(' ');
        var m = int.Parse(firstLine[0]);
        var n = int.Parse(firstLine[1]);
        var r = int.Parse(firstLine[2]);

        var a = new int[m][];

        for (int i = 0; i < m; i++)
            a[i] = Console.ReadLine().Split(' ').Select(int.Parse).ToArray(); 

        Rotate(a, r);
        Display(a);

    }
}