most developers have been facing the problem that pages
not appears same in different browsers.mostly internet
explorer makes problem than other browsers.

to overcome that probelm different style sheets for different
browsers is a good approach -

for creating own exception class,you have to derive your class
from System.Exception class.also you have to implement all
constructors which base class implements.to create own
exception class follow the requirements/recommendations
below-

to convert bitmap image file to gif file you
have to create bitmap object first.

the following codes uses FileUpload control to
upload file to server.it's a example for
uploading files to the server using asp.net
and c#.

most of the time we need to create reports while dealing
with statistical data or finacial data.statistics should be
available to download.this statistics or reports should be
in a easily understandable format like excel file format.