VB.NET IsNumeric() – Code Sample

VB.NET IsNumeric Example – Code Sample Syntax

Abstract: – Illustrates using .

 *** 1. Download Source Code *** 

VB.NET Syntax StringManipulation IsNumeric download Download Source Code for All VB Console Examples in One Project

 *** 2. IsNumeric Syntax *** 


Purpose:
Returns a Boolean value that indicates if the string is Numeric.


Syntax:
IsNumeric(string)

Parameters Description
string Required – string that you want to determine if
it represents a numeric value.

Result Data Type Description
boolean indicates if string is numeric


 *** 3. IsNumeric – Quick Example *** 

Dim strField As String = “100.00”
Console.WriteLine(IsNumeric(strField)) ‘Returns True – decimals are numeric

 *** 4. IsNumeric – Full Example *** 

IsNumeric Example Output Screenshot


VB.NET Syntax StringManipulation IsNumeric screenshot


Step 1: Click Visual Basic to Cut-n-paste code into clsIsNumeric.vb

Public Class clsIsNumeric
 
    Public Sub Main()
 
        '****************************************************************************************
        ' Purpose:  Returns a Boolean value that indicates if the string is Numeric.
        '
        ' Syntax: 	IsNumeric(string)
        '
        ' Parameter1: string - Required - string that you want to determine if
        ' it represents a numeric value.
        '
        ' Result: boolean - indicates if string is numeric
        '
        ' Quick Example:  Dim strField As String = "100.00"
        ' Console.WriteLine(IsNumeric(strField)) 'Returns True - decimals are numeric
        '
        '****************************************************************************************
 
        '****************************************************************************************
        ' Example #1: IsNumeric(string)
        ' Returns a Boolean value that indicates if the string is Numeric. 
        '****************************************************************************************
 
        Console.WriteLine("Example #1: IsNumeric(strField)")
 
        Dim strField As String = "100.00"
 
        Console.WriteLine(IsNumeric(strField)) 'Returns True - decimals are numeric
 
        'write blank line to make output easier to read
        Console.WriteLine()
 
 
 
        '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 myclsIsNumeric As New clsIsNumeric
        myclsIsNumeric.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 StringManipulation IsNumeric

  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 “StringManipulation”
    • Right-click project name in solution explorer;
    • add new folder;
    • name of folder could be: StringManipulation
  4. Add Class Named clsIsNumeric to StringManipulation folder
    • Right-click StringManipulation folder;
    • add new item;
    • Select class
    • Class name could be clsIsNumeric
  5. Click on Visual Basic in code in step 1 above to copy code into clsIsNumeric.vb
  6. Click on Visual Basic in code in step 2 above to copy code into Module1.vb
  7. Click green arrow or press F5 to run program