How to Go Back to the Previous Page in ASP.NET 2.0 with C#

Go back to 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);

}