高分!读取文件服务器共享目录的文件,有设置用户名密码, 现在验证通不过

[客户有话说]

文件服务器上的共享目录, 用下面这段代码读取的时候,抱错 用户名密码错误.
错误就发生在这句: myResponse = CType(myFileWebRequest.GetResponse(), Net.FileWebResponse)

完整代码如下, 请问是不是还缺了什么? 方案暂时不变,就是用这个. 手动在浏览器输入用户名密码,下面的代码执行正常.

Dim theNetworkCredential As New Net.NetworkCredential("shareuser", "P@ssword123", "servername")
            Dim myFileWebRequest As Net.FileWebRequest
            Dim myURLstring As New Uri("file://10.86.26.167/fs1/grampian.csv")

            Dim myResponse As Net.FileWebResponse
            myFileWebRequest = CType(Net.FileWebRequest.Create(myURLstring), Net.FileWebRequest)
            myFileWebRequest.Credentials = theNetworkCredential
            myFileWebRequest.Timeout = 100000
            myFileWebRequest.Method = "POST"
            myFileWebRequest.ContentType = "application/x-www-form-urlencoded"

            myResponse = CType(myFileWebRequest.GetResponse(), Net.FileWebResponse)

            Dim myStream As Stream = myResponse.GetResponseStream()
            Dim reader As StreamReader = New StreamReader(myStream)