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Verify/Retrieve is a Numeric Value

Summary: Sometimes you want to verify that the data you enter really is a number. If it isn't default the value to 0.
 
Keywords: CDBL
CHECK
CINT
CLNG
FIXNUMBER
ISNUMERIC
NUMBER
NUMERIC
VALIDATION
Applicable Software: Active Server Pages .NET (ASP.NET)
Visual Basic .NET (VB.NET)
 
Body:

It's important to validate that data is what you expect it to be. This function takes a parameter and if it is a number, it converts it to a double and returns it. If it is not a number, it returns 0. For the classic ASP/VBScript people out there, there is a VBScript version of this FixNumber function. 

Public Shared Function FixNumber(numberToFix As Object) As Double

	Dim ret As String
	Dim out As Double
		
		ret = CType(numberToFix, String)

		Try
			out = Double.Parse(ret)
		Catch x As FormatException
			out = 0
		End Try
		
		Return out

End Function

To use it, you would do: 

Dim id As Integer = FixNumber(Request.Params("id"))

 
Author: Douglas L. Setzer, II, http://www.27seconds.com
Posted On: 12/21/2005 2:16:35 PM

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