vb.net程序。求组合数，其中m,n用inputbox函数输入。要求用用户自定义过程计算阶乘，组

Public Class Form1 Private Function jc1(ByVal q) Dim i%, p% p = 1 For i = 1 To q Step 1 p = p * i Next Return p End Function Private Sub Button1_Click(ByVal sender As System.Objec