Creating Connection

To create a connection to QuickBooks Online, the ADO.NET Provider can be used through the C1QuickBooksOnlineConnection class. This class requires a connection string to be provided as an argument, which can be created in either of the following ways:

• Generated using the C1QuickBooksOnlineConnectionStringBuilder class by specifying individual statements.
• Constructed manually by writing the connection string directly.

The following code shows how the C1QuickBooksOnlineConnectionStringBuilder class can be used to configure the connection string for QuickBooks Online and consumed by the C1QuickBooksOnlineConnection class to create a connection to QuickBooks Online server. Here you can query the data or request modifications.

static void CreatingConn()
{           
    //Configure Connection string
    C1QuickBooksOnlineConnectionStringBuilder builder = new C1QuickBooksOnlineConnectionStringBuilder
    {
        OAuthClientId = OAuthClientId,
        OAuthClientSecret = OAuthClientSecret,
        OAuthTokenEndpoint = OAuthTokenEndpoint,
        OAuthAccessToken = OAuthAccessToken,
        OAuthRefreshToken = OAuthRefreshToken,
        CompanyId = CompanyId,
        UseSandbox = true
    };
    //Setup Connection
    using (C1QuickBooksOnlineConnection conn = new C1QuickBooksOnlineConnection(builder.ConnectionString))
    {
        conn.OAuthTokenRefreshed += OAuthTokenRefreshed;
        //Tried fetching data from two different tables
        C1QuickBooksOnlineCommand comm = new C1QuickBooksOnlineCommand(conn, "Select * from Customers");
        C1QuickBooksOnlineDataAdapter adapter = new C1QuickBooksOnlineDataAdapter(comm);
        DataTable dataTable = new DataTable();
        adapter.Fill(dataTable);
        //Display fetched data
        foreach (DataRow row in dataTable.Rows)
        {
            Console.WriteLine("{0}\t{1}\t{2}", row["CompanyName"], row["DisplayName"], row["Active"]);
        }
        Console.WriteLine("Connection created and read operation completed !!!");
    }
}