arcgis engine vb.net 开发

we08

各路大侠，不才要做毕业设计，用arcgis engine  vb.net开发，抄了个代码如下：
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim openFileDialogl As OpenFileDialog = New OpenFileDialog()
        openFileDialogl.Title = "打开Map地图"
        openFileDialogl.Filter = "Map Documents(*.shp)|*.shp"
        openFileDialogl.ShowDialog()
        Dim sFilePath As String
        sFilePath = openFileDialogl.FileName
        If sFilePath = "" Then Exit Sub
        On Error GoTo errorhandler_loadmxfile
        AxMapControl1.LoadMxFile(sFilePath)
        Exit Sub
errorhandler_loadmxfile:
        MsgBox(sFilePath & "不能导入！" + vbCrLf + "错误：" + Err.Description)
    End Sub
结果运行出错：在 System.Reflection.TargetInvocationException 中第一次偶然出现的“mscorlib.dll”类型的异常，有人说是版本问题，我的版本是4.0.30319.239