// For complete examples and data files, please go to https://github.com/aspose-diagram/Aspose.Diagram-for-.NET
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_VisioPages();

//Load vdw file
Diagram diagram = new Diagram(dataDir +"source.VSTX");

foreach (Page page in diagram.Pages)
{
    Diagram dia = new Diagram();
    dia.Pages[0].Copy(page);
    dia.Save(dataDir + page.Name+ ".vsdx", SaveFileFormat.VSDX);
}