C#报错使用泛型类型的“Stack”需要1个类型的参数 和无法运用于方法组和int 操作数怎么解决

class Class1
{
static string De(int N, int D)
{
Stack stack = new Stack();
if (D < 2 || D > 16)
{
throw new ArgumentOutOfRangeException("D", "指示灯是否");

        }
        do
            {
                int residue = N % D;
                char c = (residue < 10) ? (char)(residue + 48) : (char)(residue + 55);
                stack.Push(c);

            }
            while ((N = N / D) != 0);
            string s = string.Empty;
            while (stack.Count > 0)
            {
                s += stack.Pop().Tostring();
            }
            return s;

    }
}

 Stack<int>