VB 2008 Thread Safe [Windows Form]

[Braincode]

Ada yang ngerti ga tentang thread safe buat aplikasi windows form?



skripsi gw tinggal selangkah lagi nih



jadi gabungin midi sound sama image processing sederhana pake picture box



anehnya kalo tuh midi nya aja yang dijalanin bisa, image processing juga bisa, eh mau digabungin gatot (gagal total)



untuk playing midi pake timer sendiri (soalnya yang bawaan visual studio ga presisi) System.InvalidOperationException was unhandled
Message="Cross-thread operation not valid: Control 'Form1' accessed from a thread other than the thread it was created on."
Source="System.Windows.Forms"
StackTrace:
at System.Windows.Forms.Control.get_Handle() at System.Windows.Forms.Control.get_InternalHandle() at System.Windows.Forms.Control.get_CreateParams() at System.Windows.Forms.PictureBox.get_CreateParams() at System.Windows.Forms.Control.SizeFromClientSize(In t32 width, Int32 height) at System.Windows.Forms.Control.SizeFromClientSize(Si ze clientSize) at System.Windows.Forms.PictureBox.GetPreferredSizeCo re(Size proposedSize) at System.Windows.Forms.Control.GetPreferredSize(Size proposedSize) at System.Windows.Forms.Layout.DefaultLayout.LayoutAu toSizedControls(IArrangedElement container) at System.Windows.Forms.Layout.DefaultLayout.xLayout( IArrangedElement container, Boolean measureOnly, Size& preferredSize) at System.Windows.Forms.Layout.DefaultLayout.LayoutCo re(IArrangedElement container, LayoutEventArgs args) at System.Windows.Forms.Layout.LayoutEngine.Layout(Ob ject container, LayoutEventArgs layoutEventArgs) at System.Windows.Forms.Control.OnLayout(LayoutEventA rgs levent) at System.Windows.Forms.ScrollableControl.OnLayout(La youtEventArgs levent) at System.Windows.Forms.Form.OnLayout(LayoutEventArgs levent) at System.Windows.Forms.Control.PerformLayout(LayoutE ventArgs args) at System.Windows.Forms.Control.System.Windows.Forms. Layout.IArrangedElement.PerformLayout(IArrangedEle ment affectedElement, String affectedProperty) at System.Windows.Forms.Layout.LayoutTransaction.DoLa yout(IArrangedElement elementToLayout, IArrangedElement elementCausingLayout, String property) at System.Windows.Forms.Control.PerformLayout(LayoutE ventArgs args) at System.Windows.Forms.Control.System.Windows.Forms. Layout.IArrangedElement.PerformLayout(IArrangedEle ment affectedElement, String affectedProperty) at System.Windows.Forms.Layout.LayoutTransaction.DoLa yout(IArrangedElement elementToLayout, IArrangedElement elementCausingLayout, String property) at System.Windows.Forms.Layout.LayoutTransaction.DoLa youtIf(Boolean condition, IArrangedElement elementToLayout, IArrangedElement elementCausingLayout, String property) at System.Windows.Forms.PictureBox.InstallNewImage(Im age value, ImageInstallationType installationType) at System.Windows.Forms.PictureBox.set_Image(Image value) at VisualisasiGitar.Form1.overlayjari(MidiEvent ev) in C:\Documents and Settings\***censored***\My Documents\Visual Studio 2008\Projects\TugasAkhir\Tugas Akhir\VisualisasiGitar\VisualisasiGitar\Form1.vb:l ine 1041 at VisualisasiGitar.Form1.PlayNote() in C:\Documents and Settings\***censored***\My Documents\Visual Studio 2008\Projects\TugasAkhir\Tugas Akhir\VisualisasiGitar\VisualisasiGitar\Form1.vb:l ine 1051 at VisualisasiGitar.Form1.Ticker_Tick(Object sender, EventArgs e) in C:\Documents and Settings\***censored***\My Documents\Visual Studio 2008\Projects\TugasAkhir\Tugas Akhir\VisualisasiGitar\VisualisasiGitar\Form1.vb:l ine 1059 at Multimedia.Timer.OnTick(EventArgs e) in C:\Documents and Settings\***censored***\My Documents\Visual Studio 2008\Projects\TugasAkhir\TgsAkhir\PrjTgsAkhir\Time r\Class1.cs:line 419 at Multimedia.Timer.TimerPeriodicEventCallback(Int32 id, Int32 msg, Int32 user, Int32 param1, Int32 param2) in C:\Documents and Settings\***censored***\My Documents\Visual Studio 2008\Projects\TugasAkhir\TgsAkhir\PrjTgsAkhir\Time r\Class1.cs:line 355
InnerException: