pressing shift key in vb.net

just to stop screen saver form starting. so it really trying to fake the machine that the computer is not inactive.
i have a loop that every 30 second send the key escape and screen saver kicks in if computer is inactive for 1 minute. the escape key is still being hit by the app but screen saver still kick in  until the next esc hit within the next 30 sec it returns to normal screen. why doesn't screen saver just stay off when the esc key is hit?

just to stop screen saver form starting. so it really trying to fake the machine that the computer is not inactive.
i have a loop that every 30 second send the key escape. i set screen saver kicks in if computer is inactive for 1 minute. the escape key is still being hit by the app every 30 seconds but screen saver still kick in  until the next esc is hit from the app. why doesn't screen saver just stay off when the esc key is hit?

This worked fine for me...successfully preventing the screensaver from invoking.  All it does is move the mouse by one pixel in the x and y directions every 59 seconds and then puts it back.  I didn't even notice it moving.  Running VB.Net 2008 on a 64 bit Vista Home Premium system:

Public Class Form1
 
    Private WithEvents tmr As New Timer
 
    Private Const MOUSEEVENTF_MOVE As Integer = &H1
    Private Declare Sub mouse_event Lib "user32" _
        (ByVal dwFlags As Integer, ByVal dx As Integer, ByVal dy As Integer, _
        ByVal cButtons As Integer, ByVal dwExtraInfo As Integer)
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        tmr.Interval = TimeSpan.FromSeconds(59).TotalMilliseconds
        tmr.Enabled = True
    End Sub
 
    Private Sub tmr_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles tmr.Tick
        mouse_event(MOUSEEVENTF_MOVE, 1, 1, 0, 0) ' move the mouse slightly
        mouse_event(MOUSEEVENTF_MOVE, -1, -1, 0, 0) ' put it back
    End Sub
 
End Class

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i had something like that but i guess microsoft detects that the mouse movement was not sent from  hardware but software so my code didnt do anything. here is what i had before

Imports System.Windows.Forms
Public Class MouseMover
    Inherits System.Windows.Forms.Form
    <Runtime.InteropServices.DllImport("user32.dll", SetLastError:=True)> _
    Private Shared Function SetCursorPos(ByVal X As Integer, ByVal Y As Integer) As Boolean
    End Function
 
    Private Sub MouseMover_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Timer1.Start()
        Timer1.Enabled = True
        Timer1.Interval = 30000
        Me.Visible = False
        Me.ShowInTaskbar = False
        Me.NotifyIcon1.Icon = Me.Icon
        Me.NotifyIcon1.Visible = True
    End Sub
 
    Private Sub Timer1_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        Dim random As New Random
        Dim x As Integer = random.Next
        Dim y As Integer = random.Next
        SetCursorPos(x, y)
    end sub
end class

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We'll...give my code a whirl!  I used mouse_event() instead of SetCursorPos().  Additionally, I'm simply moving the cursor by ONE pixel to the Right and Down and then putting it RIGHT BACK.  It worked on my system (Vista)...