Among all the static content of a PDF, links are required to jump from one location to other location within the document or outside the document. Creating hyperlinks is one such way which not only helps in navigating through the content but also makes it interactive. Hyperlinks can be presented in different forms, like an image, text, or any type of visible element that, when clicked, redirects you to a specified url. 

The C1PdfDocument class provides AddLink methods for adding hyperlinks to your PDF documents which takes the following two parameters:

• A string that specifies a url
• A RectangleF that specifies the area on the current page

Note that the AddLink method does not add any visible content to the page, so you may need another command along with it to specify some text or an image that the user can see.

To add a hyperlink in the page, use the following code. In this example, we have added a string that says "Visit Documentation Website" and linked it to the Mescius website.

pdf.DrawString("Visit the Documentation Website", font, Brushes.Black, rect);
pdf.AddLink("https://developer.mescius.com/componentone/docs", rect);

You can also add local links, which when clicked can take you to another location within the same PDF document. This type of link helps you to implement cross-referencing within the document, such as a table of contents or an index.

Local links are identical to regular hyperlinks, except for two things:

• The url parameter must start with a "#".
• You must specify the target location for the link using the AddTarget method. The AddTarget method takes the same parameters as AddLink, a string that specifies the name of the target and a rectangle that marks the area on the page that is displayed when the user selects the link.