if you want to prevent running multiple instance
of the same c# application then check the
following lines.It's sometime necessary to prevent
running multiple instances of the same application.

You have a problem on paypal button? When you use the script given from paypal for article, the button gets visible but when clicked on it defines no action..The solution is simple...

You have to change the Text Filters setting to "No Filters" for all users in global configuration and must make the text editors to none after that add the paypal code button script. It works fine...

Problem Solved.

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Ultimatecine.com

how to use private browsing?

If you don't want to save cookies and histories for certain activities
and for security purposes while browsing then Press CTRL + Shift + N,
which will launch new private browsing for Chrome, CTRL + Shift + P will
do it for Firefox and IE.

you can use online paypal buy button in your page
for receiving online paypal payment.when users click
this buy button they will enter in payment page
for payment.

I have given many interviews on c#,asp.net jobs and
went through the questions.here i am posting,It may
help you -

when you run asp.net application project from visual
studio,visual studio uses their development server.
It's not the right way to develop asp.net appication.

command objects use parameters for passing values
to sql statements for type cheking,validation,guarding
against SQL injection attacks,etc.so its a good practice
to use command parameters to sql statements.