How to edit Visual C# xml config file

Hi Experts

I have a registry entry with the location of my database inside, and inside of the xml config file it defines the path of the database, but it is hard coded... I can display the information of the registry in a label, but how do i get the path that's in the registry inside of the xml config file

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
    </configSections>
    <connectionStrings>
        <add name="Road_Call_Fuel_Transactions.Properties.Settings.TransportScheduling_ConnectionString"
            connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\\ben\TransportScheduling_be.mdb"
            providerName="System.Data.OleDb" />
    </connectionStrings>
</configuration>

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