Merge multiple PDF files into one using VB.NET

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In the following code sample you can see how you can easily merge PDF files into one. It creates a new document and then adds a clone of the pages from each input document. Please take note that the input files will not be read until they are needed, so you can only close the input files until a copy has been made by writing the new document to the disk. This is done for efficiency: if you import a 1000-page document and only need the first page containing a certain keyword, then the rest of the pages will not be processed.