How to pass the errors from a class to windows imeediatel as and when it occurs

Hi
I am developing and applicaiton in C# (windows). I have a class module "ClsExample" where i have some methods and functions. With this scenario i wanted to display the error which i am getting in my class module, to be more precise i wanted to display them immediately when the error occurs, one after the other all of them in the windows Form. Hope i am clear with my question. Can any one give me a hint where to begin and how to goahed. Thanks in advance.