Problem while creating multiple slides using sdk

Hi everyone,
When I am creating 1 slide no problem..
But, when I am trying to create more than 1 slide, then problem is coming..

Data is coming properly, But while opening ppt file It is asking for Repair...When I say repair then data is properly coming. 

But when 1 slide is there then it is opening perfectly without any repair..

Plase help me out....
Thanks in advance...
My code is....

public PresentationPart CreatePages(PresentationPart presentationPart1, ArrayList alPages)
{
int iTotalSlides = alPages.Count;
GeneratePresentationPart1Content(presentationPart1, iTotalSlides);
SlidePart slidePart1 = presentationPart1.AddNewPart<SlidePart>();
for (int i = 0; i < alPages.Count; i++)
{
slidePart1 = presentationPart1.AddNewPart<SlidePart>("rIdslidePart"+(i+1));
AddNewPage(i+1, slidePart1);
}
SlideLayoutPart slideLayoutPart1 = slidePart1.AddNewPart<SlideLayoutPart>("rIdslideLayoutPart1");
GenerateSlideLayoutPart1Content(slideLayoutPart1);
slidePart1.AddPart(slideLayoutPart1);

SlideMasterPart slideMasterPart1 = slideLayoutPart1.AddNewPart<SlideMasterPart>("rIdslideMasterPart1");
GenerateSlideMasterPart1Content(slideMasterPart1);
slideMasterPart1.AddPart(slideLayoutPart1, "rId1");

presentationPart1.AddPart(slideMasterPart1, "rId1");
ThemePart themePart1 = slideMasterPart1.AddNewPart<ThemePart>("rIdthemMaster12");
GenerateThemePart1Content(themePart1);
presentationPart1.AddPart(themePart1, "rIdtheme5");
return presentationPart1;
}

public void AddNewPage(List<PageBO> lstPageDetails, int iPageNum,SlidePart slidePart1)
{
Slide slide1 = new Slide();
slide1.AddNamespaceDeclaration("a", "http://schemas.openxmlformats.org/drawingml/2006/main");
slide1.AddNamespaceDeclaration("r", "http://schemas.openxmlformats.org/officeDocument/2006/relationships");
slide1.AddNamespaceDeclaration("p", "http://schemas.openxmlformats.org/presentationml/2006/main");
CommonSlideData commonSlideData1 = new CommonSlideData();
ShapeTree shapeTree1 = new ShapeTree();
.........
}

private void GeneratePresentationPart1Content(PresentationPart presentationPart1, int iTotalSlides)
{
	Presentation presentation1 = new Presentation() { SaveSubsetFonts = true };
	presentation1.AddNamespaceDeclaration("a", "http://schemas.openxmlformats.org/drawingml/2006/main");
	presentation1.AddNamespaceDeclaration("r", "http://schemas.openxmlformats.org/officeDocument/2006/relationships");
	presentation1.AddNamespaceDeclaration("p", "http://schemas.openxmlformats.org/presentationml/2006/main");

	SlideMasterIdList slideMasterIdList1 = new SlideMasterIdList();

	SlideIdList slideIdList1 = new SlideIdList();
	for (int i = 0; i < iTotalSlides; i++)
	{
		SlideId slideId1 = new SlideId();
		slideId1.RelationshipId = "rIdslidePart" + (i + 1);
		slideId1.Id = Convert.ToUInt32(i + 256);
		slideIdList1.Append(slideId1);

		SlideMasterId slideMasterId1 = new SlideMasterId() { Id = Convert.ToUInt32(i + 2147483648), RelationshipId = "rId"+(i+1) };
		slideMasterIdList1.Append(slideMasterId1); 
	}
	.........
}

// Generates content of slideMasterPart1.
private void GenerateSlideMasterPart1Content(SlideMasterPart slideMasterPart1)
{
	SlideMaster slideMaster = new SlideMaster(
	new CommonSlideData(new ShapeTree(
	  new P.NonVisualGroupShapeProperties(
	  new P.NonVisualDrawingProperties() { Id = (UInt32Value)1U, Name = "" },
	  new P.NonVisualGroupShapeDrawingProperties(),
	  new ApplicationNonVisualDrawingProperties()),
	  new GroupShapeProperties(new DocumentFormat.OpenXml.Drawing.TransformGroup()),
	  new P.Shape(
	  new P.NonVisualShapeProperties(
		new P.NonVisualDrawingProperties() { Id = (UInt32Value)2U, Name = "Title" },
		new P.NonVisualShapeDrawingProperties(new DocumentFormat.OpenXml.Drawing.ShapeLocks() { NoGrouping = true }),
		new ApplicationNonVisualDrawingProperties(new PlaceholderShape() { Type = PlaceholderValues.Title })),
	  new P.ShapeProperties(),
	  new P.TextBody(
		new DocumentFormat.OpenXml.Drawing.BodyProperties(),
		new DocumentFormat.OpenXml.Drawing.ListStyle(),
		new DocumentFormat.OpenXml.Drawing.Paragraph())))),
	new P.ColorMap() { Background1 = D.ColorSchemeIndexValues.Light1, Text1 = D.ColorSchemeIndexValues.Dark1, Background2 = D.ColorSchemeIndexValues.Light2, Text2 = D.ColorSchemeIndexValues.Dark2, Accent1 = D.ColorSchemeIndexValues.Accent1, Accent2 = D.ColorSchemeIndexValues.Accent2, Accent3 = D.ColorSchemeIndexValues.Accent3, Accent4 = D.ColorSchemeIndexValues.Accent4, Accent5 = D.ColorSchemeIndexValues.Accent5, Accent6 = D.ColorSchemeIndexValues.Accent6, Hyperlink = D.ColorSchemeIndexValues.Hyperlink, FollowedHyperlink = D.ColorSchemeIndexValues.FollowedHyperlink },
	new SlideLayoutIdList(new SlideLayoutId() { Id = (UInt32Value)2147483649U, RelationshipId = "rId1" }),
	new TextStyles(new TitleStyle(), new BodyStyle(), new OtherStyle()));

	slideMasterPart1.SlideMaster = slideMaster;
}
// Generates content of themePart1.
private void GenerateThemePart1Content(ThemePart themePart1)
{
	.......
}

// Generates content of slideLayoutPart1.
private void GenerateSlideLayoutPart1Content(SlideLayoutPart slideLayoutPart1)
{
	SlideLayout slideLayout1 = new SlideLayout() { Type = SlideLayoutValues.Object, Preserve = true };
	slideLayout1.AddNamespaceDeclaration("a", "http://schemas.openxmlformats.org/drawingml/2006/main");
	slideLayout1.AddNamespaceDeclaration("r", "http://schemas.openxmlformats.org/officeDocument/2006/relationships");
	slideLayout1.AddNamespaceDeclaration("p", "http://schemas.openxmlformats.org/presentationml/2006/main");
	....
}

If it works after the repair, I would suggest saving a copy of the repaired version, then compare the original with the repaired version. The Open XML SDK 2.0 Productivity Tool is great for comparing documents.

You don't list all the code for the AddNewPage routine. I'd venture a guess that it is in there. BTW, do you "save" the slide after creating it?

Hi,
    Look at the master reference Id's
 While adding master page to PresentationPart, you have used "rIdSlideMasterPart1" (marked right side), and while adding each slide you are using ' "rId":+(i+1) '.

Please refer this thread. I have given an example how to add multiple slides. To add slides in specific position refer this thread.  Hope you get the answer there.

Thank u all for your response.

Now everything is working fine.