我怎樣才能回到上一頁在ASP.Net和C＃

Question

想象一下，我有一個按鈕，它有「OnClick="GoBack"」我想要它去上一頁，C＃函數代碼將如何看起來像？

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); 
} 
}