vb.net异常OleDB与数据库ACCESS

Question

如果只有这些代码

Imports System
Imports System.Data.OleDb
Public Class Form1
    Dim con As New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;data source=C:\Users\cesar\Escritorio\centroeducativo.mdb")
    Dim cmd As New OleDbCommand
    Dim ds As New DataSet()
        Private Sub Form1_Load(ByVal sender As Object, _
    ByVal e As System.EventArgs) Handles MyBase.Load
        Try
            con.Open()
            con.Close()

        Catch ex As Exception

        End Try
    End Sub
End Class

为什么显示错误

Excepción del tipo 'System.Data.OleDb.OleDbException' en System.Data.dll
Excepción del tipo 'System.InvalidOperationException' en System.Data.dll

我已经连接到源数据

我没什么不寻常的，我很困惑