Visual Basic Validation Checks VB NET Beginners Programming Tutorial VB Input Validation

Описание: In this lesson we look at How to Check the Inputs which Users enter onto Screen Forms. This includes data they have typed in as well as selections they have made.

This lesson continues on from the work covered in the Rectangle Perimeter and Area Lesson. It contains extensive input Data Validation, including using the "Focus" property to send the
cursor to a single specific object on the Screen Form, immediately after a validation error has been detected.

Although not absolutely essentail, we recommend that you have completed the Rectangle Perimeter and Area Lesson before doing this Detailed Validation Lesson.

Use the Index Below to skip to various Index points in the video if you need to.

00:00 Lesson Intro and Overview
00:51 Validation Examples from the Rectangle Calculator Lesson
01:43 Stage 1 of Development - Main Processing only - No Validation
02:14 Program Testing with problematic "Homer Simpson" type Inputs
03:46 Validation - Existence and Prescence Checking
04:31 Program Crashes due to Empty and Blank Input
05:44 Data issues associated with Non-Metric Units
06:38 The Three Main Validation Techniques
07:56 Validation cannot guarantee Data Accuracy
08:46 The Two Coding methods for adding validation to a Program
10:23 Try...Catch... End Try Validation Method
12:07 Limitations of Try...Catch... End Try Validation
12:22 If...ElseIf...Else...EndIf Method for Validation
12:33 How to Make a Validation Check List
16:45 Dedicated DoValidation() Subroutine with If...Elseif...Else...Endif
21:50 Highlighting Validation Errors using Object Focus
24:50 Applying Post Validation Object Focus to Radio Buttons
25:28 Applying Object Focus to Combo Box Drop Down Lists
25:26 The Ready to Go Flag after Validation is complete
29:08 Standard Modularisation Framework for Program Validation
31:07 Testing all of the Validation is working correctly
33:56 Testing that Good Data Inputs give correct results
34:36 The 80-20 Rule for Program Development and Testing
35:08 Validation in other Programs
37:11 String Validation Using ASCII Codes
38:04 Getting the Free Resources for this Lesson
40:10 Information about the Full Programming Course
40:31 Video Wrap Up and Outro

Visual Basic is a great beginner's programming language which can be used for developing prototype applications which run program code behind screen forms.

This video will be useful for anyone learning Visual Basic, especially students doing VCE Computing or VCE Software Development high school courses in Australia.

You can download a Free PDF hard copy of this presentation, as well as the MS Word step by step guide containing all of the instructions and programming code at the following link:
https://tinyurl.com/y8httslt

The Step By Step Word Document gives you all of the material including the Form Design and Program Code, which you can copy and paste from the Word document into your Visual Basic Project.

You can check out our full Programming Course at the following link:
http://passyworldofict.com/programming

We are planning to make a number of Programming Videos that will be a great course for people to learn how to program in Visual Basic and Python.

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Enjoy,
Passy