Power point presentation in VB.net

Imports Office = Microsoft.Office.Core
Imports Graph = Microsoft.Office.Interop.Graph
Imports PowerPoint = Microsoft.Office.Interop.PowerPoint

       Const MyTemplate = "C:\Program Files\Microsoft Office\Templates\Presentation Designs\Blends.pot"
       Const MyPicture = "C:\WINNT\Soap Bubbles.bmp"

        Dim MyApplication As PowerPoint.Application
        Dim MyPresentation As PowerPoint.Presentation
        Dim MySlide As PowerPoint.Slide
        Dim MyAssistantOn As Boolean


        MyApplication = New PowerPoint.Application()
        MyApplication.Visible = True
        MyApplication.WindowState = PowerPoint.PpWindowState.ppWindowMinimized

        MyPresentation = MyApplication.Presentations.Open(sTemplate, , , True)

        
	MySlide = MyPresentation.Slides.Add(1, PowerPoint.PpSlideLayout.ppLayoutTitleOnly)
        With MySlide.Shapes.Item(1).TextFrame.TextRange
            .Text = "My Presentation"
            .Font.Name = "Vardana"
            .Font.Size = 36
        End With
        MySlide.Shapes.AddPicture(MyPicture, False, True, 150, 150, 500, 350)
        MySlide = Nothing

        MySlide = MyPresentation.Slides.Add(2, PowerPoint.PpSlideLayout.ppLayoutTitleOnly)
        With MySlide.Shapes.Item(1).TextFrame.TextRange
            .Text = "My Chart Presentation"
            .Font.Name = "Comic Sans MS"
            .Font.Size = 48
        End With
        Dim MyChart As Graph.Chart
        MyChart = MySlide.Shapes.AddOLEObject(150, 150, 480, 320,MSGraph.Chart.8").OLEFormat.Object

        MyChart.ChartType = Graph.XlChartType.xl3DPie
        MyChart = Nothing
        MySlide = Nothing

	MySlide = MyPresentation.Slides.Add(3, PowerPoint.PpSlideLayout.ppLayoutBlank)
        MySlide.FollowMasterBackground = False
        Dim MyShape As PowerPoint.Shape
        MyShape = MySlide.Shapes.AddTextEffect(Office.MsoPresetTextEffect.msoTextEffect27,
            "The End", "Impact", 96, False, False, 230, 200)
        MyShape.Shadow.ForeColor.SchemeColor = PowerPoint.PpColorSchemeIndex.ppForeground
        MyShape.Shadow.Visible = True
        MyShape.Shadow.OffsetX = 3
        MyShape.Shadow.OffsetY = 3
        MyShape = Nothing
        MySlide = Nothing

        Dim SlideIdx(3) As Integer
        SlideIdx(0) = 1
        SlideIdx(1) = 2
        SlideIdx(2) = 3
        With MyPresentation.Slides.Range(SlideIdx).SlideShowTransition
            .AdvanceOnTime = True
            .AdvanceTime = 3
            .EntryEffect = PowerPoint.PpEntryEffect.ppEffectBoxOut
        End With
        Dim MySettings As PowerPoint.SlideShowSettings
        MySettings = MyPresentation.SlideShowSettings
        MySettings.StartingSlide = 1
        MySettings.EndingSlide = 3

        MyAssistantOn = MyApplication.Assistant.On
        MyApplication.Assistant.On = False

        MySettings.Run()
        Do While MyApplication.SlideShowWindows.Count >= 1
            System.Windows.Forms.Application.DoEvents()
        Loop
        MySettings = Nothing

        If MyAssistantOn Then
            MyApplication.Assistant.On = True
            MyApplication.Assistant.Visible = False
        End If

        MyPresetation.Saved = True
        MyPresetation.Close()
        MyPresetation = Nothing
        MyApplication.Quit()
        MyApplication = Nothing
        GC.Collect()
    End Sub