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

Using the CDSDataAdapter

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 CDSDataAdapter is slower than the CDSDataReader because the Fill method needs to retrieve all data from the data source before returning.

The following example selects the accountid and Name columns of the Accounts table:

C#

string connectionString = "InitiateOAuth=GETANDREFRESH;OrganizationUrl=https://myaccount.crm.dynamics.com/;";

using (CDSConnection connection = new CDSConnection(connectionString)) {
  CDSDataAdapter dataAdapter = new CDSDataAdapter(
  "SELECT accountid, Name FROM Accounts", connection);

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

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

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

VB.NET

Dim connectionString As String = "InitiateOAuth=GETANDREFRESH;OrganizationUrl=https://myaccount.crm.dynamics.com/;"

Using connection As New CDSConnection(connectionString)
  Dim dataAdapter As New CDSDataAdapter("SELECT accountid, Name FROM Accounts", connection)

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

  Console.WriteLine("Contents of Accounts.")

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