what is the error in my .net2003 windows application mouse move programme?: vb.net2003 windows application.

what is the error in my .net2003 windows application mouse move programme?

i worked the following programming.
I want to click button3 thorough mouse pointer from button1 coding
I ran the programme. but I got no one reaction. button3 was not clicked.
what is the reason?

Imports System
Imports System.Windows.Forms
Imports System.Runtime.InteropServices
 
Public Class mouseclickprogramme
    Inherits System.Windows.Forms.Form
 
    <DllImport("user32.dll", CharSet:=CharSet.Auto, CallingConvention:=CallingConvention.StdCall)> _
        Public Shared Sub mouse_event(ByVal dwFlags As Long, ByVal dx As Long, ByVal dy As Long, ByVal cButtons As Long, ByVal dwExtraInfo As Long)
    End Sub
 
    Private Const MOUSEEVENTF_LEFTDOWN As Integer = &H2
    Private Const MOUSEEVENTF_LEFTUP As Integer = &H4
    Private Const MOUSEEVENTF_RIGHTDOWN As Integer = &H8
    Private Const MOUSEEVENTF_RIGHTUP As Integer = &H10
 
    Public Sub DoMouseClick()
        'Call the imported function with the cursor's current position
        Dim X As Integer = Cursor.Position.X
        Dim Y As Integer = Cursor.Position.Y
        mouse_event(MOUSEEVENTF_LEFTDOWN Or MOUSEEVENTF_LEFTUP, X, Y, 0, 0)
    End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
        DoMouseClick()
    End Sub
 
    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        MsgBox("ok")
    End Sub
 
 consider the above commands. I run the programme. no one reaction I found. 
i put the following line that place(70,20) has a command button3 but  no one reaction i found 
 mouse_event(MOUSEEVENTF_LEFTDOWN Or MOUSEEVENTF_LEFTUP, 70,20, 0, 0)

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Several problems with that code...

First, mouse_event() should have Type Integer, not Long (that is a VB6 declaration):

<DllImport("user32.dll", CharSet:=CharSet.Auto, CallingConvention:=CallingConvention.StdCall)> _
Public Shared Sub mouse_event(ByVal dwFlags As Integer, ByVal dx As Integer, ByVal dy As Integer, ByVal cButtons As Integer, ByVal dwExtraInfo As Integer)
End Sub

Second, as pivar pointed out, you need to pass mouse_event() SCREEN coordinates. You can do this with PointToScreen():

Dim pt As Point = Me.PointToScreen(Button3.Location)
pt.Offset(Button3.Width / 2, Button3.Height / 2) ' get middle of the button

Finally, I moved the cursor using the built-in Cursor.Position() as this will allow it to work in 32 or 64 bit environments:

Public Sub DoMouseClick(ByVal pt As Point)
'Call the imported function with the cursor's current position
Cursor.Position = pt
mouse_event(MOUSEEVENTF_LEFTDOWN Or MOUSEEVENTF_LEFTUP, 0, 0, 0, 0)
End Sub

Here is the whole thing:

Imports System
Imports System.Windows.Forms
Imports System.Runtime.InteropServices
Public Class mouseclickprogramme
    Inherits System.Windows.Forms.Form
 
    <DllImport("user32.dll", CharSet:=CharSet.Auto, CallingConvention:=CallingConvention.StdCall)> _
    Public Shared Sub mouse_event(ByVal dwFlags As Integer, ByVal dx As Integer, ByVal dy As Integer, ByVal cButtons As Integer, ByVal dwExtraInfo As Integer)
    End Sub
 
    Private Const MOUSEEVENTF_LEFTDOWN As Integer = &H2
    Private Const MOUSEEVENTF_LEFTUP As Integer = &H4
    Private Const MOUSEEVENTF_RIGHTDOWN As Integer = &H8
    Private Const MOUSEEVENTF_RIGHTUP As Integer = &H10
 
    Public Sub DoMouseClick(ByVal pt As Point)
        'Call the imported function with the cursor's current position
        Cursor.Position = pt
        mouse_event(MOUSEEVENTF_LEFTDOWN Or MOUSEEVENTF_LEFTUP, 0, 0, 0, 0)
    End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim pt As Point = Me.PointToScreen(Button3.Location)
        pt.Offset(Button3.Width / 2, Button3.Height / 2) ' get middle of the button
        DoMouseClick(pt)
    End Sub
 
    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        MsgBox("ok")
    End Sub
 
End Class

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what is the error in my .net2003 windows application mouse move programme?

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