Concept of exceptions in dot net environment

Question

Question 1:

Design a form based applications by using labels, text boxes, and buttons to carry out basic arithmetic operations on integers.

Question 2:

Illustrate out the concept of Exceptions in .Net environment.

Question 3:

Write down a simple XML file for student details (sno, sname, sbranch, saddr).
 
Question 4:

What do you understand by the term DTD? Write down the building blocks of DTD?

Question 5:

Write down a program which uses the nodeValue property to change the text node of first element in "college.xml” (say for example).
 
Question 6:

Intend a form to carry out calculator functions using vb.net

Question 7:

Write down a XML with database with book details (BOOK ID, Title, Subject, Author, published Year, vendor, language and price).