Can we declare variables in the 'app.config' file?

Question

I have a form which needs to get connected to SQL Server, and I have a drop down for selecting the list of databases and perform operations like primary key checking, etc.

Answer 1

you can use the connectionStrings tag in the app.config configuration. You can add as many as you want (giving them each a separate key) and then retrieve them

example app.config xml (set providerName to a valid provider, for example System.Data.SqlClient, and the appropriate connection string) :

example on getting them and listing them (in your case, you would create the appropriate items in the dropdown and set the values) :

ConnectionStringSettingsCollection settings =
            ConfigurationManager.ConnectionStrings;

        if (settings != null)
        {
            foreach(ConnectionStringSettings cs in settings)
            {
                Console.WriteLine(cs.Name);
                Console.WriteLine(cs.ProviderName);
                Console.WriteLine(cs.ConnectionString);
            }
        }