如何解决'System.Data.OleDb.OleDbException'类型的第一次机会异常

Question

我已经按照所有教程连接并创建了一个基本命令。经过几个小时的诊断，我仍然无法找出错误。我做错了什么？

Imports System.Data.OleDb 

Public Class Form2 

    Dim connStr As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=Databases11.accdb" 
    Dim conn As New OleDbConnection(connStr)
    Dim command As OleDbCommand 
    Dim dt As DataTable
    Dim da As OleDbDataAdapter 
    Dim sqlStr As String 

    Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        sqlStr = "select * from Color"
        dt = New DataTable()
        da = New OleDbDataAdapter(sqlStr, connStr)
        da.Fill(dt) 
        da.Dispose()
        txtMID.Text = dt.Rows(0)("Color_Name") 
    End Sub

End Class

这是我看到的错误：

  

类型'System.Data.OleDb.OleDbException'的第一次机会异常      发生在System.Data.dll

中