向一个7*7的二维数组中插入不重复的1-49的数字

public static void SetValue()
        {
            //定义一个7*7的二维数组，定义一个随机函数用来产生随机数，定义一个 ArrayList用来记录产生的随机数
            int[,] myArray = new int[7,7];
            Random rd = new Random();
            ArrayList myList = new ArrayList();
            for (int i = 0; i < 7; i++)
            {
                for (int j = 0; j < 7; j++)
                {
                    //随机产生一个1-49的随机数，使用ArrayList存储产生的数字，来验证是否存在重复的数字
                    int thisValue = rd.Next(1,50);
                    if (!myList.Contains(thisValue))
                    {
                        myList.Add(thisValue);
                        myArray[i, j] = thisValue;
                        Console.Write(thisValue+",");
                    }
                    //如果产生的数字出现重复则循环产生一个随机数字，直到插入不重复
                    else
                    {
                        do
                        {
                            thisValue = rd.Next(1, 50);

                        } while (myList.Contains(thisValue));
                         myArray[i, j] = thisValue;
                         myList.Add(thisValue);
                         Console.Write(thisValue+",");
                    }
                }
               
            }
           
        }