Solve this error message..

Anyone knows what does it says?

An unhandled exception of type 'System.IO.DirectoryNotFoundException' occurred in GAC_System.Windows.Forms_v1_0_3300_0_cneutral_1.dll

What exactly does your code look like. Just from scanning over the thrown exception indicates a directory that does not exist was trying to get accessed.

My code...

VB Code:

Imports System.Object
Imports System.IO
 
Public Class Form1
    Inherits System.Windows.Forms.Form
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu
 
#Region " Windows Form Designer generated code "
 
    Public Sub New()
        MyBase.New()
 
        'This call is required by the Windows Form Designer.
        InitializeComponent()
 
        'Add any initialization after the InitializeComponent() call
 
    End Sub
 
    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        MyBase.Dispose(disposing)
    End Sub
 
    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents tbmain As System.Windows.Forms.TextBox
    Private Sub InitializeComponent()
        Me.MainMenu1 = New System.Windows.Forms.MainMenu()
        Me.tbmain = New System.Windows.Forms.TextBox()
        Me.Button1 = New System.Windows.Forms.Button()
        '
        'tbmain
        '
        Me.tbmain.Location = New System.Drawing.Point(24, 32)
        Me.tbmain.Multiline = True
        Me.tbmain.Size = New System.Drawing.Size(192, 128)
        Me.tbmain.Text = "TextBox1"
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(112, 200)
        Me.Button1.Size = New System.Drawing.Size(104, 40)
        Me.Button1.Text = "Button1"
        '
        'Form1
        '
        Me.ClientSize = New System.Drawing.Size(240, 270)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.tbmain)
        Me.Menu = Me.MainMenu1
        Me.Text = "Form1"
 
    End Sub
 
    Public Shared Sub Main()
        Application.Run(New Form1())
        Directory.CreateDirectory("D:\Louis\Misc\listing.txt")
    End Sub
 
#End Region
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim sIn As StreamReader
        Dim cLine As String
        Dim bDone As Boolean = False
 
        Dim din As StreamReader = File.OpenText("D:\Louis\misc\listing.txt")
        Try
            While Not bDone
                cLine = sIn.ReadLine()
                If cLine Is Nothing Then
                    bDone = True
                Else
                    tbmain.Text = tbmain.Text & cLine
                End If
            End While
        Finally
            sIn.Close()
 
        End Try
 
 
    End Sub
End Class

Try this and see what you come up with...

VB Code:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim sIn As StreamReader
        Dim cLine As String
        Dim bDone As Boolean = False
 
        Try
           Dim din As StreamReader = File.OpenText("D:\Louis\misc\listing.txt")
        Catch ex As Exception
            MessageBox.Show(ex.toString)
        End Try
 
        
 
        Try
            While Not bDone
                cLine = sIn.ReadLine()
                If cLine Is Nothing Then
                    bDone = True
                Else
                    tbmain.Text = tbmain.Text & cLine
                End If
            End While
        Finally
            sIn.Close()
 
        End Try
 
 
    End Sub

I run this on the PocketPC Emulator but the message box shows " System.IO.DirectoryNotFoundException"

I think it somehow still can't find a route to my D:/ ?