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

Using the ExchangeDataReader

The ExchangeDataReader retrieves data faster than the ExchangeDataAdapter because it can retrieve data in pages. As you read data from the ExchangeDataReader, it periodically requests the next page of results from the data source, if required. This causes results to be returned at a faster rate. The following example selects all the columns from the Contacts table:

C#

string connectionString = "User='[email protected]';Password='myPassword';Server='https://outlook.office365.com/EWS/Exchange.asmx';Platform='Exchange_Online';Schema='EWS';";

using (ExchangeConnection connection = new ExchangeConnection(connectionString)) {
  ExchangeCommand cmd = new ExchangeCommand("SELECT * FROM Contacts", connection);
  
  ExchangeDataReader rdr = cmd.ExecuteReader();

  while (rdr.Read()) {
    Console.WriteLine(String.Format("\t{0} --> \t\t{1}", rdr["LastModifiedByName"], rdr["GivenName"]));
  }
}

VB.NET

Dim connectionString As String = "User='[email protected]';Password='myPassword';Server='https://outlook.office365.com/EWS/Exchange.asmx';Platform='Exchange_Online';Schema='EWS';"

Using connection As New ExchangeConnection(connectionString)
  Dim cmd As New ExchangeCommand("SELECT * FROM Contacts", connection)

  Dim rdr As ExchangeDataReader = cmd.ExecuteReader()

  While rdr.Read()
    Console.WriteLine([String].Format(vbTab & "{0} --> " & vbTab & vbTab & "{1}", rdr("LastModifiedByName"), rdr("GivenName")))
  End While
End Using