NO CODING : Filter Gridview with Radiobuttonlist

This No code behind binding
Table Name : JOBTABLE
Fields : JobId, Position, Company, Location, Experience, Information

ASPX

Location
    <asp:CheckBoxList ID="CheckBoxList1" runat="server" AutoPostBack="True" 
        DataSourceID="SqlDataSource1" DataTextField="Location" 
        DataValueField="Location" RepeatDirection="Horizontal" RepeatLayout="Flow">
    </asp:CheckBoxList>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:TESTConnectionString %>" 
        SelectCommand="SELECT DISTINCT [Location] FROM [JOBTABLE] WHERE ([Location] IS NOT NULL) ORDER BY [Location]">
    </asp:SqlDataSource>
    <asp:HiddenField ID="HiddenField1" runat="server" />
    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
        DataKeyNames="JobId" DataSourceID="SqlDataSource2">
        <Columns>
            <asp:BoundField DataField="JobId" HeaderText="JobId" InsertVisible="False" 
                ReadOnly="True" SortExpression="JobId" />
            <asp:BoundField DataField="Position" HeaderText="Position" 
                SortExpression="Position" />
            <asp:BoundField DataField="Company" HeaderText="Company" 
                SortExpression="Company" />
            <asp:BoundField DataField="Location" HeaderText="Location" 
                SortExpression="Location" />
            <asp:BoundField DataField="Experience" HeaderText="Experience" 
                SortExpression="Experience" />
            <asp:BoundField DataField="Information" HeaderText="Information" 
                SortExpression="Information" />
        </Columns>
    </asp:GridView>
    <asp:SqlDataSource ID="SqlDataSource2" runat="server" 
        ConnectionString="<%$ ConnectionStrings:TESTConnectionString %>" 
        SelectCommand="SELECT * FROM [JOBTABLE] WHERE (@Location LIKE '%' + [Location] + '%')">
        <SelectParameters>
            <asp:ControlParameter ControlID="HiddenField1" Name="Location" 
                PropertyName="Value" Type="String" />
        </SelectParameters>
    </asp:SqlDataSource>

C#

protected void Page_Load(object sender, EventArgs e)
    {
        HiddenField1.Value = "";
        foreach (ListItem li in CheckBoxList1.Items)
        {
            if (li.Selected == true)
            {
                HiddenField1.Value = HiddenField1.Value + "," + li.Text;
            }

        }
    }