The CData ADO.NET Provider for CSV implements two ADO.NET interfaces you can use to retrieve data from CSV: CSVDataAdapter and CSVDataReader objects. Whereas CSVDataAdapter objects retrieve a single result set of all the data that matches a query, CSVDataReader objects fetch data in subset increments as needed.

Using the CSVDataAdapter

Use the adapter's Fill method to retrieve data from the data source. An empty DataTable instance is passed as an argument to the Fill method. When the method returns, the DataTable instance is populated with the queried data. Note that the CSVDataAdapter is slower than the CSVDataReader because the Fill method needs to retrieve all data from the data source before returning.

The following example selects the Email and Username columns of the NorthwindOData table:

C#

string connectionString = "GenerateSchemaFiles=OnStart;URI=https://MyAPI;Location=C:\\MySchemaFolder;";

using (CSVConnection connection = new CSVConnection(connectionString)) {
  CSVDataAdapter dataAdapter = new CSVDataAdapter(
  "SELECT Email, Username FROM NorthwindOData", connection);

  DataTable table = new DataTable();
  dataAdapter.Fill(table);

  Console.WriteLine("Contents of NorthwindOData.");

  foreach (DataRow row in table.Rows) {
    Console.WriteLine("{0}: {1}", row["Email"], row["Username"]);
  }
}

VB.NET

Dim connectionString As String = "GenerateSchemaFiles=OnStart;URI=https://MyAPI;Location=C:\\MySchemaFolder;"

Using connection As New CSVConnection(connectionString)
  Dim dataAdapter As New CSVDataAdapter("SELECT Email, Username FROM NorthwindOData", connection)

  Dim table As New DataTable()
  dataAdapter.Fill(table)

  Console.WriteLine("Contents of NorthwindOData.")

  For Each row As DataRow In table.Rows
    Console.WriteLine("{0}: {1}", row("Email"), row("Username"))
  Next
End Using