How to go back to the previous page in ASP.NET 2.0 with C#

// static variable

static string prevPage = String.Empty;

protected void Page_Load(object sender, EventArgs e)

{

if( !IsPostBack )

{

prevPage = Request.UrlReferrer.ToString();

}

}

protected void Button1_Click(object sender, EventArgs e)

{

Response.Redirect(prevPage);

}
--------------------

protected void Page_Load(object sender, EventArgs e)

{

if( !IsPostBack )

{

ViewState["RefUrl"] = Request.UrlReferrer.ToString();

}

}

protected void Button3_Click(object sender, EventArgs e)

{

object refUrl = ViewState["RefUrl"];

if (refUrl != null)

Response.Redirect((string)refUrl);

}