Probleme en compilation

Imports System.Data.OleDb
Public Class Form1

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim cn As OleDbConnection = New OleDbConnection("provider=microsoft.jet.oledb.4.0;data source=c:\abc\np.mdb")
cn.Open()
Dim cmd As OleDbCommand = cn.CreateCommand()
cmd.CommandText = "insert into np values(" + txt1.Text + ",'" + txt2.Text + "')"
Dim res As Integer = cmd.ExecuteNonQuery()
If (res = 0) Then
MsgBox("echec d'ajout")
Else
MsgBox("l'ajout de patient")
End If
cn.Close()

End

End Sub
End Class


voila mon code l compilatur m'affiche base introuvable malgrés l'adresse est corecte