When we use class file in ASP.NET

Hi Andrew,

We use class file because if we made some changes to the system, then this will require to change in every single file. Suppose we required connection string to establish connection, if we put that connection string in a class file  when there is a change in the connection  string we can modify it that class file only ,but if we will not put that string into a class then we have to change it in every page where we have declared the connection string

Advantages are code reusability

Thanks