use a form and a text box in it to show the entered number and use 15 buttons to create numbers and (+,-,/,*) in it.
Calculator form
Text Box
| 1 | 2 | 3 | * |
| 4 | 5 | 6 | / |
| 7 | 8 | 9 | - |
| 0 | C | = | + |
the numbers and signs which have used are buttons of form.
Example:
First, When enter a number like 22 means click on 2 two times next, if the user enter one of the (+,-,*,/) wait user to enter second number (like:13)
then,when the user Click on the = button in this case by paying attention to the signs and calculate for example: + so after calculating the numbers 22+13 and pushing the = button ,print the result on the text box
Note: If user click on the C button so delete the current number or signs (+,-,*,/).

Joe WilsonPosted Apr 21, 2014, 8:55 AM
Joe WilsonPosted Apr 21, 2014, 8:54 AM
Best Wishes
Joe WilsonPosted Apr 21, 2014, 8:51 AM
Best Wishes
Joe Wilson
Abhay ShankerPosted Apr 7, 2014, 11:20 PM
http://code.msdn.microsoft.com/windowsdesktop/Simple-Calculator-d1d8cf4c
http://www.sourcecodeera.com/blogs/Samath/Simple-Calculator-using-C-.aspx
http://allcodes4web.wordpress.com/2012/09/08/create-a-simple-calculator-using-c-net/
http://www.homeandlearn.co.uk/csharp/csharp_s2p16.html
http://basiccalcu.blogspot.com/
Abhijeet SinghPosted Apr 7, 2014, 1:30 PM
Check this link:
http://programmingprojects.site50.net/calculator.php
if it is helpful please mark it as answer.
Quwwat khanPosted Apr 7, 2014, 11:28 AM
then reply me its very esay just like this ,and download this rar file ..
Munesh SharmaPosted Apr 7, 2014, 8:13 AM
http://www.c-sharpcorner.com/UploadFile/ad779a/basic-calculator-in-C-Sharp/