Vladan,
           I have implemented the two GridView setup, the primary GridView connected to "ObjectDataSourceCRS" shows all the records from the database. The second GridView connected to "ObjectDataSource1" should display the filtered data returned from the database. GridView2 only appears after data is bound to the GridView through the ObjectDataSource1.

I carried out another debug session and I don't know what i was seeing last week but this week it would look like it is only returning the first value (whilst stepping through it's the only one that it to show) in the list of possible values (should be 5 values).

I have reposted the HTML code below.
<Start HTML Code>
<%@ Control language="vb" Inherits="HomeProd.Modules.Tmgr_CourseType.ViewTmgr_CourseType" CodeFile="ViewTmgr_CourseType.ascx.vb" AutoEventWireup="false" Explicit="True" %>
<%@ Register TagPrefix="dnn" TagName="Audit" Src="~/controls/ModuleAuditControl.ascx" %>
<table cellspacing="0" style="text-align: left">
    <tr>
        <td>
            <p align="center">
                <font color="maroon" size="4"><strong>Filter On</strong></font>
            </p>
        </td>
        <td>
            <p align="center">
                <font color="maroon" size="4"><strong>Text to Filter On</strong></font>
            </p>
        </td>
        <td>
        </td>
    </tr>
    <tr>
        <td>
            <div align="center">
                <asp:DropDownList ID="DDLCol" runat="server">
                    <asp:ListItem></asp:ListItem>
                    <asp:ListItem>CourseID</asp:ListItem>
                    <asp:ListItem>CourseName</asp:ListItem>
                    <asp:ListItem>Vendor</asp:ListItem>
                </asp:DropDownList></div>
        </td>
        <td>
            <div align="center">
                <asp:TextBox ID="txtFilter" runat="server" Width="129px"></asp:TextBox></div>
        </td>
        <td>
            &nbsp;
            <asp:Button ID="btnFilter" runat="server" OnClick="btnFilter_Click" Text="Filter" />
            &nbsp;<asp:Button ID="btnClear" runat="server" OnClick="btnClear_Click" Text="Reset" />
            &nbsp;</td>
    </tr>
</table>
&nbsp;&nbsp;&nbsp;&nbsp;
<table>
    <tr>
        <td>
<asp:GridView ID="GridView1" runat="server" CellPadding="4" ForeColor="#333333" GridLines="Vertical" AllowPaging="True" AutoGenerateColumns="False" Font-Size="Smaller" DataSourceID="ObjectDataSourceCRS" OnPageIndexChanging="gridView1_PageIndexChanging">
    <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
    <RowStyle BackColor="#EFF3FB" />
    <EditRowStyle BackColor="#2461BF" />
    <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
    <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
    <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
    <AlternatingRowStyle BackColor="White" />
    <Columns>
        <asp:BoundField DataField="CourseID" HeaderText="CourseID" SortExpression="CourseID" >
            <HeaderStyle ForeColor="White" />
        </asp:BoundField>
        <asp:BoundField DataField="CourseName" HeaderText="CourseName" SortExpression="CourseName" >
            <HeaderStyle ForeColor="White" />
        </asp:BoundField>
        <asp:BoundField DataField="CourseVendor" HeaderText="CourseVendor" SortExpression="CourseVendor" >
            <HeaderStyle ForeColor="White" />
        </asp:BoundField>
        <asp:BoundField DataField="ModuleID" HeaderText="ModuleID" SortExpression="ModuleID" Visible="False" />
        <asp:BoundField DataField="ID" HeaderText="ID" SortExpression="ID" Visible="False" />
    </Columns>
</asp:GridView>
        </td>
        <td style="width: 20px">
        </td>
        <td>
<asp:GridView ID="GridView2" runat="server" AllowPaging="True" AutoGenerateColumns="False"
    CellPadding="4" DataSourceID="ObjectDataSource1" Font-Size="X-Small" ForeColor="#333333"
    GridLines="Vertical">
    <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
    <Columns>
        <asp:BoundField DataField="CourseID" HeaderText="CourseID" SortExpression="CourseID">
            <HeaderStyle ForeColor="White" />
        </asp:BoundField>
        <asp:BoundField DataField="CourseName" HeaderText="CourseName" SortExpression="CourseName">
            <HeaderStyle ForeColor="White" />
        </asp:BoundField>
        <asp:BoundField DataField="CourseVendor" HeaderText="CourseVendor" SortExpression="CourseVendor">
            <HeaderStyle ForeColor="White" />
        </asp:BoundField>
        <asp:BoundField DataField="ModuleID" HeaderText="ModuleID" SortExpression="ModuleID"
            Visible="False" />
        <asp:BoundField DataField="ID" HeaderText="ID" SortExpression="ID" Visible="False" />
    </Columns>
    <RowStyle BackColor="#EFF3FB" />
    <EditRowStyle BackColor="#2461BF" />
    <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
    <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
    <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
    <AlternatingRowStyle BackColor="White" />
</asp:GridView>
        </td>
    </tr>
</table>
<asp:ObjectDataSource ID="ObjectDataSourceCRS" runat="server" TypeName="HomeProd.Modules.Tmgr_CourseType.Tmgr_CourseTypeController" OldValuesParameterFormatString="original_{0}" SelectMethod="GetTmgr_CourseTypes">
</asp:ObjectDataSource>
<asp:ObjectDataSource ID="ObjectDataSource1" runat="server" OldValuesParameterFormatString="original_{0}"
    SelectMethod="GetTmgr_FltTraining" TypeName="HomeProd.Modules.Tmgr_CourseType.Tmgr_CourseTypeController">
    <SelectParameters>
        <asp:ControlParameter ControlID="txtFilter" Name="CourseID" PropertyName="Text" Type="String" DefaultValue="" />
    </SelectParameters>
</asp:ObjectDataSource>

<End HTML Code>

Regards..
Peter.

Vladan,
            I have resolved my problem, sometimes it seems one just overlooks the obvious..

I found that in my Tmgr_CourseTypeController Class file I had incorrectly coded the DataBase call and it was returning a single object instead of a list of objects. Correcting this call has fixed my problem and it now returns as expected.

Below is what I had and then ewhat it should have been...

<incorrect Code>
        Public Function GetTmgr_FltTraining(ByVal CourseID As String)  As Tmgr_CourseTypeInfo

            'Return CType(CBO.FillObject(DataProvider.Instance().GetTmgr_FltTraining(CourseID), GetType(Tmgr_CourseTypeInfo)), Tmgr_CourseTypeInfo)
        End Function
<end Incorrect Code>

<Correct Code>
         Public Function GetTmgr_FltTraining(ByVal CourseID As String) As List(Of Tmgr_CourseTypeInfo)
            Return CBO.FillCollection(Of Tmgr_CourseTypeInfo)(DataProvider.Instance().GetTmgr_FltTraining(CourseID))
        End Function

<end correct Code>

Vladan,
               I would also like to take this oportunity to thank you for your assistance.

Regards..

Peter