Hyperlink to go back to previous page in asp .net

If you are using asp.net then remember that

javascript:history.go(-1)

and

window.history.back()

Both will take you to back page.
But the previous page will not be exactly previous page.

For example

Suppose you are on page Default.aspx and there is a asp:button
Now when you click on the button and you are back on Default.aspx
in this situation your previous page is still you Default.aspx

Take another exapmle
You have two pages Default1.aspx and Default2.aspx
Condition 1:- button clicked on Default1.aspx which redirect you to Default2.aspx
ok your previous page is Default1.aspx
Condition 2:- button clicked on Default1.aspx and post back on the same Default1.aspx page
Now your previous page is still Default1.aspx

---

Edit

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

and use this in back button as follows

 protected void Button3_Click(object sender, EventArgs e)
 {
      object refUrl = ViewState["RefUrl"];
      if (refUrl != null)
          Response.Redirect((string)refUrl);
 }

you can use this:

<a href='javascript:history.go(-1)'>Go Back to Previous Page</a>

For Going to previous page

First Method

<a href="javascript: history.go(-1)">Go Back</a>

Second Method

<a href="##" onClick="history.go(-1); return false;">Go back</a> 

if we want to more than one step back then increase

For going 2 steps back history.go(-2)
For going 3 steps back history.go(-3)
For going 4 steps back history.go(-4)
and so on........