[C#] Errore "ISAM installabile"

[antoninolion]

dballarmi= new System.Data.OleDb.OleDbConnection();

string pathDB;

try
{
pathDB = "Provider=Microsoft.Jet.OLEDB.4.0; Data source=c:\\DataBase\\mydb.mdb";
dballarmi.ConnectionString=pathDB;


dballarmi.Open();



dballarmi.Close();


oppure:

dballarmi= new System.Data.OleDb.OleDbConnection();

string pathDB;

try
{
pathDB = @"Provider=Microsoft.Jet.OLEDB.4.0; Data source=c:\DataBase\mydb.mdb";
dballarmi.ConnectionString=pathDB;


dballarmi.Open();
dballarmi.Close();



mi da errore sempre a "dballarmi.open"