Set SqlConnection in a DLL

You can use the Settings object, of the Configuration object, or design a solution yourself.

Try expanding the 'Properties' treeview item under your ptoject in the solution explorer, you'll see Settings.settings. You can add the connectionstring there and retrieve is in code. The other solution is to add a new file to your project (Application Configuration) and add the connectionstring in the ConnectionStrings section.

<?xml version="1.0"?>
<configuration>
 <connectionStrings>
        <clear />
        <add name="Name" connectionString="ConnectionStringX" />
 </connectionStrings>
</configuration>

You must reference the System.Configuration library in order to call the ConfigurationManager.ConnectionStrings["Name"].ConnectionString which will return the connectionstring (in this case ConnectionStringX)

Have Fun!

Eduard