Visual Basic 2010 Express Tutorial 6 - Data Parsing Error Checking and An User Friendly Interface

Code Download: http://www.schoolfreeware.com
This is Part 3 Simple Calculator
Data Parsing is more powerful than using VAL() STR(). The code for parsing is the datatype.parse

Examples

Integer.Parse
Single.Parse
Double.Parse

Error Handling:

Try
Code
Catch
Code
End Try

When there is an error, like typing "A" when a integer is expected will cause an error. The error is caught and the code within Catch is run.

Category:

Science & Technology

Tags:

• SchoolFreeware
• VB
• Visual
• Basic
• 2010
• Express
• Download
• VB.net
• Programming
• Application
• Windows
• Easy
• Quick
• VisualBasic
• .net
• 4.0
• dot
• net
• MS
• Freeware
• Interface
• Simple
• Calculator
• Error
• Checking
• Data
• Parsing
• Integer
• Single
• Double
• software

[EncloseMurcielago]

what exactly is parsing?



[QuarkToo]

You are the best teacher I have ever had! I love these videos. I am doing them one at a time and am loving this design environment. Microsoft should give you a huge chunk of funding cause I am going to buy VB and I am sure lots of others do too.

[zygisrko]

@jayblink95

You can just use this code instead

TextBox1.Clear

TextBox2.Clear

And it will just clear it. :P

[jayblink95]

@SchoolFreeware PLEASE READ! Hi i was listening to your tutorial and i thought it was great, i decided to add to your Calculator and you might want to add this to any of your tutorials :)

It is basically the "A/C" button...

You create a button and change the text to "A/C" then you double click on it and edit the code. and paste this into the space :):

TextBox1.Text = "0"

TextBox2.Text = "0"

And it will bring both numbers back to default ("0")

Please Tell Me What You Think!!!!!!!!!!

[staffersteward]

How can I do if I put the invalid number and I want all of LabelAnswer, TextBoxN1 & TextBoxN2 to be clear. when error window poped up.

[staffersteward]

This way make me more confuse

[YouMurderer019]

@SuperMediaWizard yeah

[Dornon2]

Doing it this way is a big waste of time and can cause confusion. The point of a variable is to take something like "str(val(textboxnum1.Text) + val(textboxnum2.Text)) and turn that into something like "ans = one + two" It makes it simple, understandable and if needed, you can use it easily in several places. I'd hate to have to type "val(textboxnum1.text)" everyone time I wanted the val of the first box. It's so much easier to type "one".

[SuperMediaWizard]

@YouMurderer019 Yo??? Seriously???



[SuperMediaWizard]

Sorry