VB.NET CStr Example – Code Sample Syntax

VB.NET CStr Example – Code Sample Syntax

Abstract: – Illustrates using .

Purpose:
Converts boolean, date, and numeric data types into String data type

Syntax:
CStr(expression)

Parameters Description
expression boolean, date, and numeric data types

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

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:

  1. Install Visual Basic (Express or Standard Edition)
  2. Install SQL Server Express
  3. Download Northwind and pubs Database
  4. Attach Northwind Database to Databases in Sql Express
  5. 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:
VB.NET Syntax Functions CStr

  1. Use Visual Basic 2010 Express or Standard Edition
  2. Create new project;
    • Click File/New Project
    • Select Console Application Template
    • Select Visual Basic for Language
    • name of project could be VBNET_Syntax.
  3. Add New folder named “Functions”
    • Right-click project name in solution explorer;
    • add new folder;
    • name of folder could be: Functions
  4. Add New subfolder named “ConversionFunctions”
    • Right-click Functions folder in solution explorer;
    • add new folder;
    • name of folder could be: ConversionFunctions
  5. Add New subfolder named “TypeConversionFunctions”
    • Right-click ConversionFunctions folder in solution explorer;
    • add new folder;
    • name of folder could be: TypeConversionFunctions
  6. Add Class Named clsCStr to TypeConversionFunctions folder
    • Right-click TypeConversionFunctions folder;
    • add new item;
    • Select class
    • Class name could be clsCStr
  7. Click on Visual Basic in code in step 1 above to copy code into clsCStr.vb
  8. Click on Visual Basic in code in step 2 above to copy code into Module1.vb
  9. Click green arrow or press F5 to run program