How do I append/import pages from one document to another?

Pages can be appended to a PDF document in number of ways. Below are some common methods:

1)Append range of pages from another document:

C#

doc1.ImportPageRange(doc2, 0, doc2.Pages.Count-1);

2)Append pages one by one:

C#

doc1.ImportPage(doc2,0);

3)Append all the pages from another document:

C#

doc1.Append(doc2);

4)Append pages from multiple document:

C#

PdfDocument.Merge(paths);

5)Append new page through index

C#

doc1.Pages.Insert(doc1.Pages.Count);

6)Appending new page

C#

doc1.Pages.Add();

Sample