Using Textbox Value In GridView SelectCommand

I'm trying to create a simple search against a SQL Database.  I setup a TextBox and a GridView, I simply need the contents of the textbox to be used on databind() in my SQL select statement.  Seems like it should be a simple thing to do, any guidance is appreciated!  Here is my code:

<%@ Page Language="VB" MasterPageFile="~/MasterPage.master" Title="IP Tracker - Search" EnableSessionState="True" %>

<script runat=server>Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)

Search_GridView.DataBind()

End Sub

</script>

 

<asp:Content ID="Content1" ContentPlaceHolderID="MasterContent" Runat="Server">

<br />

<strong>Search for IP</strong><br />

<br />

<input id="SearchBox" type="text" /><br />

<asp:Button ID="Button1" runat="server" Text="Please Work..." onclick="Button1_Click"/><br />

<br />

&nbsp;<asp:GridView ID="Search_GridView" runat="server" DataSourceID="SqlDataSource1" EmptyDataText="No Records Match">

</asp:GridView>

<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:IP_TrackerConnectionString %>"

SelectCommand="SELECT * FROM [AddressTable] WHERE ([IPAddress] LIKE '%' + SearchBox.text + '%')">

<SelectParameters>

<asp:FormParameter FormField="SearchBox" Name="IPAddress" Type="String" />

</SelectParameters></asp:SqlDataSource>

</asp:Content>