Design a class file with two methods as sum and subtraction which takes two arguments. Design a web page to take two integer numbers from the user. When user clicks on sum or subtraction button, display the result of two entered values in the label control placed on the web page. (Use of App_code & Bin directory).

First Add class file and named "mathOperation.cs"

Step1: right click on BCA_SEM4 in Solution Explorer then Add > Add New Items > class file (rename with mathOperation.cs) then click on add ( it will ask you to create an App_Code folder so click on Yes . )

step2: create two following methods sum and subtraction as showing below:

mathOperation.cs ( class file )