VB.NET CStr Example – Code Sample Syntax
VB.NET CStr Example – Code Sample Syntax
Abstract: – Illustrates using VB.NET CStr Code Example.
Purpose:
Converts boolean, date, and numeric data types into String data type
Syntax:
CStr(expression)
CStr(expression)
Parameters | Description | expression | boolean, date, and numeric data types |
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Result Data Type | Description | String | 1. If boolean, returns string “True” or “False” 2. If date, returns A string containing a date value (date and time) in the short date format of your system 3. If number, returns a string representing the number |
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Step 1: Click Visual Basic to Cut-n-paste code into clsCStr.vb
Public Class clsCStr Public Sub Main() '***************************************************************************************** ' Purpose: Converts boolean, date, and numeric data types into String data type ' ' Syntax: CStr(expression) ' ' Parameter1: expression - boolean, date, and numeric data types ' ' Result: String - 1. If boolean, returns string "True" or "False" ' 2. If date, returns A string containing a date value (date and time) in the short date ' format of your system ' 3. If number, returns a string representing the number ' '**************************************************************************************** ' This example is from http://idealprogrammer.com Console.WriteLine("Example #1: CStr(expression) - boolean") Dim myBool As Boolean = True Dim String1 As String = CStr(myBool) Console.WriteLine(String1) ' Returns "True" 'write blank line to make output easier to read Console.WriteLine() Console.WriteLine("Example #2: CStr(expression) - date") Dim myDate As Date = "10/21/2011" Dim String2 As String = CStr(myDate) Console.WriteLine(String2) ' Returns 10/21/2011 'write blank line to make output easier to read Console.WriteLine() Console.WriteLine("Example #3: CStr(expression) - number") Dim String3 As String = CStr(5.5) Console.WriteLine(CStr(String3)) ' Returns 5.5 'Prevent console from closing before you press enter Console.ReadLine() End Sub End Class |
Step 2: Click Visual Basic to Cut-n-paste code into Module1.vb
Module Module1 Sub Main() Dim myclsCStr As New clsCStr myclsCStr.Main() End Sub End Module |
Prerequistes:
- Install Visual Basic (Express or Standard Edition)
- Install SQL Server Express
- Download Northwind and pubs Database
- Attach Northwind Database to Databases in Sql Express
- Attach pubs Database to Databases in Sql Express
Notes:
- Console Application is used to simplify things, but Windows Forms or Web Forms could also be used
- You can build a library of syntax examples by using same project over and over and just commenting out what you do not want to execute in Module1.vb
Instructions:
- Use Visual Basic 2010 Express or Standard Edition
- Create new project;
- Click File/New Project
- Select Console Application Template
- Select Visual Basic for Language
- name of project could be VBNET_Syntax.
- Add New folder named “Functions”
- Right-click project name in solution explorer;
- add new folder;
- name of folder could be: Functions
- Add New subfolder named “ConversionFunctions”
- Right-click Functions folder in solution explorer;
- add new folder;
- name of folder could be: ConversionFunctions
- Add New subfolder named “TypeConversionFunctions”
- Right-click ConversionFunctions folder in solution explorer;
- add new folder;
- name of folder could be: TypeConversionFunctions
- Add Class Named clsCStr to TypeConversionFunctions folder
- Right-click TypeConversionFunctions folder;
- add new item;
- Select class
- Class name could be clsCStr
- Click on Visual Basic in code in step 1 above to copy code into clsCStr.vb
- Click on Visual Basic in code in step 2 above to copy code into Module1.vb
- Click green arrow or press F5 to run program