获取IP地址：
代码如下：
protected void Button3_Click(object sender, EventArgs e)
{
string userIP = Request.UserHostAddress.ToString();
Response.Cookies["IP"].Value = userIP;//给cookies赋值
}
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = Request.Cookies["IP"].Value;//获取cookies的值
}