ASP.NET 2.0 C# - GridView Retrieve More Data on databound

I have a gridview that is pulling data from a database, in the gridview i have 3 radio buttons per row - once the grid is populated, I want to retrieve data from another table to select the radiobuttons that have been previously selected by the user - sometimes the user may not have made any selections so all radio buttons will be unselected.

this is my gridview so far

    <asp:GridView ID="gvSchedule" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource1" >
        <Columns>
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:RadioButton ID="AwayTeam" runat="server" GroupName="teamGroup" />
                </ItemTemplate>
            </asp:TemplateField>
            <asp:BoundField DataField="Schedule_id" HeaderText="Schedule_id" InsertVisible="False"
                ReadOnly="True" SortExpression="Schedule_id" Visible="False" />
            <asp:ImageField DataImageUrlField="Away_Image" ReadOnly="True">
            </asp:ImageField>
            <asp:BoundField DataField="AWAY_TEAM_NAME"  HeaderText="Away Team" SortExpression="AWAY_TEAM_NAME" />
             <asp:TemplateField>
                <ItemTemplate>
                    <asp:RadioButton ID="TieTeam" runat="server" GroupName="teamGroup" />
                </ItemTemplate>
              </asp:TemplateField>
            <asp:BoundField DataField="HOME_TEAM_NAME"  HeaderText="Home Team"  SortExpression="HOME_TEAM_NAME" />
            <asp:ImageField DataImageUrlField="Home_Image" ReadOnly="True">
            </asp:ImageField>
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:RadioButton ID="HomeTeam" runat="server" GroupName="teamGroup" />
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:Personal %>"
        SelectCommand="GetSchedule" SelectCommandType="StoredProcedure" UpdateCommand="InsertPicks" UpdateCommandType="StoredProcedure">
        <SelectParameters>
            <asp:ControlParameter ControlID="lblStartDate" DefaultValue="1/1/1900" Name="SCHEDULE_START_DATE"
                PropertyName="Text" Type="DateTime" />
            <asp:ControlParameter ControlID="lblEnddate" DefaultValue="1/1/1900" Name="SCHEDULE_END_DATE"
                PropertyName="Text" Type="DateTime" />
        </SelectParameters>
    </asp:SqlDataSource>Start Free Trial