Change catalog for connection string dynamically

Hi,

I have this scenario where I have several organisations using the same application but have different databases. Right now I solve this through having different installations for each organisation. However when I update this gets tedious of course. So I wonder is it possible for me to just alter the database catalog in the connectionstring and use the same application code for all organisations?

My connecdtion string looks like this in web.config:

<connectionStrings>
    <!--Test-->
     <!--DEFAULT(Peter) CONNECTION--> 
    <add name="connDB" connectionString=" Data Source=.\SQLEXPRESS;Initial Catalog=developmentDB;Integrated Security=True" providerName="System.Data.SqlClient"/>   
  </connectionStrings>

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So, my question can I change the database name (catalog=developmentDB) to another database based on some variable I give it dynamically?

Thanks for help!

Peter