private void GetData()
{
OleDbConnection myConn=new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+Application.StartupPath+@"\mydb.mdb");
myConn.Open();
OleDbDataAdapter myAdapter= new OleDbDataAdapter("SELECT * from mytable",myConn);
OleDbCommandBuilder myBuilder=new OleDbCommandBuilder(myAdapter);
DataSet myDataSet=new DataSet();
myAdapter.Fill(myDataSet,"myTable");
dataGrid1.DataSource = myDataSet.Tables["myTable"];
myConn.Close();
}