Asp. Net How do other pages call pages written by Web user controls

Add the following code when the page that you want to add paging is loaded :(take the book category as an example)

 
Paging p = Paging1; //Web User control ID 
p.DataControl = gvBookType; // The control to bind data to (here is GridView )  
p.TableName = "BookShop_BookType"; 
p.Sort = "asc"; 
p.Column = "BookType_ID";