Note that OracleTable can be used in data binding with DataGrid as it implements IListSource interface.

This example demonstrates how to retrieve OracleTable object from server and display its elements. To create required type and table and fill it with data you can use the following script:

CREATE OR REPLACE TYPE TEmployees AS 
  TABLE OF VARCHAR2(40);

CREATE TABLE CompanyEmpObject (
  Code NUMBER PRIMARY KEY,
  Company VARCHAR2(40),
  Employees TEmployees        
)NESTED TABLE Employees STORE AS N_TAB;

INSERT INTO CompanyEmpObject
  (Code, Company, Employees)
VALUES
  (1, 'Microsoft', TEmployees('PROGRAMMER', 'MANAGER', 'ELECTRICIAN', 'CLEANUP MEN'));
INSERT INTO CompanyEmpObject
  (Code, Company, Employees)
VALUES
  (2, 'Borland', TEmployees('PROGRAMMER', 'ELECTRICIAN', 'COURIER'));
INSERT INTO CompanyEmpObject
  (Code, Company, Employees)
VALUES
  (3, 'MC Donalds', TEmployees('SHOP ASSISTANT', 'CLERK',  'CLEANUP MEN'));
INSERT INTO CompanyEmpObject
  (Code, Company, Employees)
VALUES
  (4, 'Ford', TEmployees('MECHANICIAN', 'MANAGER'));

OracleConnection connection = new OracleConnection("User Id=scott;Password=tiger;Data Source=ora");
OracleCommand command = new OracleCommand("SELECT * FROM CompanyEmpObject", connection);
connection.Open();
OracleDataReader dataReader = command.ExecuteReader();
try{
  int index = dataReader.GetOrdinal("Employees");
  while (dataReader.Read()) {
    OracleTable oraTable = dataReader.GetOracleTable(index);
    if (!oraTable.IsNull) {
      string[] employees = new string[oraTable.Count];
      for (int i = 0; i < oraTable.Count; i++)
        employees[i] = (string)oraTable[i];

      Console.WriteLine("Company: " + dataReader.GetString(1));
      foreach (string str in employees)
        Console.WriteLine("\t" + str);
    }
    else{
      Console.WriteLine("Company: " + dataReader.GetString(1));
      Console.WriteLine("No vacancies");
    }
  }
}
catch (Devart.Data.Oracle.OracleException ex) {
  Console.WriteLine(ex.Message);
}
finally{
  dataReader.Close();
  connection.Close();
}
Console.ReadLine();

Dim connection As New OracleConnection("User Id=scott;Password=tiger;Data Source=ora")
Dim command As New OracleCommand("SELECT * FROM CompanyEmpObject", connection)
connection.Open()
Dim dataReader As OracleDataReader = command.ExecuteReader()
Try
  Dim index As Integer = dataReader.GetOrdinal("Employees")
  While dataReader.Read()
    Dim oraTable As OracleTable = dataReader.GetOracleTable(index)
    If Not oraTable.IsNull Then
      Dim employees(oraTable.Count) As String
      Dim I As Integer
      For I = 0 To oraTable.Count - 1
        employees(I) = oraTable(I)
      Next I
      Console.WriteLine("Company: " & dataReader.GetString(1))
      For Each str As String In employees
        Console.WriteLine(Chr(9) & str)
      Next
    Else
      Console.WriteLine("Company: " & dataReader.GetString(1))
      Console.WriteLine("No vacancies")
    End If
  End While
Catch ex As Devart.Data.Oracle.OracleException
  Console.WriteLine(ex.Message)
Finally
  dataReader.Close()
  connection.Close()
End Try

System.Object
   Devart.Data.Oracle.OracleArray
      Devart.Data.Oracle.OracleTable

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

OracleTable Members
Devart.Data.Oracle Namespace