private void Button1_Click(object sender, System.EventArgs e)
{
	Response.Redirect((new StringBuilder("http://localhost/WebApplication5"))
                            .Append("/webform2.aspx?param1=")
		.Append(Server.UrlEncode(TextBox1.Text)).ToString(), false);

}

private void Page_Load(object sender, System.EventArgs e)
{
	// Put user code to initialize the page here
	TextBox1.Text = Request.QueryString["param1"].ToString();
}