VB.NET IsNumeric() – Code Sample
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VB.NET IsNumeric Example – Code Sample Syntax
Abstract: – Illustrates using VB.NET IsNumeric Code Example.
*** 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
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 |
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 |
Module Module1
Sub Main()
Dim myclsIsNumeric As New clsIsNumeric
myclsIsNumeric.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 “StringManipulation”
- Right-click project name in solution explorer;
- add new folder;
- name of folder could be: StringManipulation
- Add Class Named clsIsNumeric to StringManipulation folder
- Right-click StringManipulation folder;
- add new item;
- Select class
- Class name could be clsIsNumeric
- Click on Visual Basic in code in step 1 above to copy code into clsIsNumeric.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
|
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