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LINQ to Data

LINQ provides general-purpose query facilities in .NET Framework 3.0 and above and provides one easy way to programmatically access data through from CData ADO.NET Data Providers. This example uses LINQ to access information from the Data Provider.

This article demonstrates how to use LINQ to access tables through the CData ADO.NET Data Provider for . To do this you will LINQ to Entity Framework, which is used to generate the connection and can be used with any CData ADO.NET Data Providers to access data via LINQ.

See the help documentation for a guide to setting up an EF 6 project to use the provider.

  1. In a new project in Visual Studio, right-click on the project and choose to add a new item. Add an ADO.NET Entity Data Model.
  2. Choose EF Designer from Database and click Next.
  3. Add a new Data Connection, and change your data source type to "CData Data Source".
  4. Enter your data source connection information.

    E*TRADE uses the OAuth authentication standard. You can use the embedded OAuth credentials or you can obtain your own by registering an app with E*TRADE. In addition to the OAuth values, you will need to specify the AccountId. See the "Getting Started" chapter of the help documentation for a guide to using OAuth.

    Below is a typical connection string:

    AccountId=MyAccountId;InitiateOAuth=GETANDREFRESH
  5. If saving your entity connection to App.Config, set an entity name. In this example we are setting EtradeEntities as our entity connection in App.Config.
  6. Enter a model name and select any tables or views you would like to include in the model.

Using the entity you created, you can now perform select , update, delete, and insert commands. For example:

EtradeEntities context = new EtradeEntities(); var accountlistQuery = from accountlist in context.AccountList select accountlist; foreach (var result in accountlistQuery) { Console.WriteLine("{0} {1} ", result.Id, result.AccountDesc); }

See "LINQ and Entity Framework" chapter in the help documentation for example queries of the supported LINQ.