how transfer connection string in ASCx to SharePoint web.cfg

In my sharepoint site, I have a child control that points to a ascx file.

I have a user control that has embeeded connection string code that will be displayed as a web part in my sharepoint site. The connection string is embeeded in the ASCX file.

Is there a way i can get the ascx file to run on my sharepoint site without the connectstring being in the ascx file.
I would keep connection strings in Web.cfg file. Is there a way to do this?

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="dg2.ascx.cs" Inherits="dg2" %>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="Data Source=training;Initial Catalog=employeecars;User ID=dbuser;Password=Training45;"
    SelectCommand="SELECT [employee_id], [employee_name] FROM [Employees]"></asp:SqlDataSource>
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" DataSourceID="SqlDataSource1"
    DataTextField="employee_name" DataValueField="employee_id">
</asp:DropDownList>
<asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="Data Source=training;Initial Catalog=employeecars;User ID=dbuser;Password=Training45;"
    SelectCommand="SELECT [car_license], [car_model] FROM [Cars] WHERE ([employee_id] = @employee_id)">
    <SelectParameters>
        <asp:ControlParameter ControlID="DropDownList1" DefaultValue="1" Name="employee_id"
            PropertyName="SelectedValue" Type="Int32" />
    </SelectParameters>
</asp:SqlDataSource>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="4"
    DataSourceID="SqlDataSource2" ForeColor="#333333" GridLines="None">
    <RowStyle BackColor="#EFF3FB" />
    <Columns>
        <asp:BoundField DataField="car_license" HeaderText="car_license" SortExpression="car_license" />
        <asp:BoundField DataField="car_model" HeaderText="car_model" SortExpression="car_model" />
    </Columns>
    <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
    <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
    <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
    <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
    <EditRowStyle BackColor="#2461BF" />
    <AlternatingRowStyle BackColor="White" />
</asp:GridView>

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