Open a PopUp Window on the ASP.NET Button Click event and pass Parameters

A User asked me how to Open a PopUp window when the user clicks on an ASP.NET Button Server Control. He also wanted to pass parameters to the url. Here's how it is done:

C#

protected void Button1_Click(object sender, EventArgs e)

{

    string queryString = 

        "http://localhost:39208/TreeView.aspx?param1=" 

        + TextBox1.Text.Trim();   

    string newWin = 

        "window.open('" + queryString + "');";

    ClientScript.RegisterStartupScript

        (this.GetType(), "pop", newWin, true);

}

VB.NET

    Protected Sub Button1_Click(ByVal sender As Object, _

                                ByVal e As EventArgs)

        Dim queryString As String = _

           "http://localhost:39208/TreeView.aspx?param1=" & _

            TextBox1.Text.Trim()

        Dim newWin As String = _

           "window.open('" & queryString & "');"

        ClientScript.RegisterStartupScript(Me.GetType(), _

                                       "pop", newWin, True)

    End Sub