ASP.NET递归法求阶乘解决思路

asp:TextBox ID="TextBox1" runat="server">/asp:TextBox>
!asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="=" />
asp:TextBox ID="TextBox2" runat="server">/asp:TextBox>

protected void Button1_Click(object sender, EventArgs e)
{
int data = Convert.ToInt32(this.TextBox1.Text.Trim());//data为大于等于0的整数
this.TextBox2.Text = jieCheng(data).ToString();
}
private static int jieCheng(int data)
{
if (data == 0) //在这里需要考虑0和1的阶乘都为1，所以data==0的时候要返回1.
{
return 1;
}
else
{
return data * jieCheng(data - 1);
}
}