如何返回上一页关于 ASP.Net 和 C#

Question

想象我有一个按钮，里面有“ OnClick="GoBack" " 我想让它转到上一页，C# 函数代码会是什么样子？

Answer 1

protected void Page_Load(object sender, EventArgs e)
{
    if(!IsPostBack)
    {
        ViewState["RefUrl"] = Request.UrlReferrer.ToString();
    }
}

protected void GoBack_Click(object sender, EventArgs e)
{
    object refUrl = ViewState["RefUrl"];
    if (refUrl != null)
    {
        Response.Redirect((string)refUrl);
    }
}