why this code doesnt work?

string ConStr = "Provider=Microsoft.Jet.OleDB.4.0; Data Source =" + Application.StartupPath + "\\Employee.mdb";
OleDbConnection Conn = new OleDbConnection(ConStr);

Conn.Open();

OleDbCommand Cmd = new OleDbCommand("Select * from Employee", Conn);
OleDbDataAdapter dAdapter = new OleDbDataAdapter(Cmd);
DataSet dDataSet = new DataSet();

DataRow AddNewRow = dDataSet.Tables["Employee"].NewRow();
AddNewRow["EmployeeID"] = textBox1.Text;
AddNewRow["EmployeeName"] = textBox2.Text;

dDataSet.Tables["Employee"].Rows.Add(AddNewRow);
dAdapter.Update(dDataSet, "Employee");

Conn.Close();

Use the "new" keyword to create an object instance.