统计输入数据出现的次数,后面二维数组遍历过后怎样使循环相加得出正确的答案啊

Question

static void Main(string[] args)
{
int [] a=new int[10];
Console.WriteLine("请输入一组整形数据：");
for (int i = 0; i < 10; i++)
{
a[i] = int.Parse(Console.ReadLine());
}
Console.WriteLine("*******************");
Console.WriteLine("数据 出现的次数");
Console.WriteLine("*******************");
int[,] b=new int[10,2];
for (int i = 0; i < 10; i++)
{
for (int j = 0; j < 2; j++)
{
b[i, 0] = a[i]; b[i, 1] = 1;
if (b[i, 0] == b[i + 1, 0])
{
b[i, 1] = b[i, 1] + 1;
}
}
Console.WriteLine("{0} {1}", b[i, 0], b[i, 1]);
}
Console.ReadLine();
}