Information.IsNumeric Method

Returns a Boolean value indicating whether an expression can be evaluated as a number.

Namespace: Microsoft.VisualBasic
Assembly: Microsoft.VisualBasic (in microsoft.visualbasic.dll)

public static bool IsNumeric (
	Object Expression
)
public static boolean IsNumeric (
	Object Expression
)
public static function IsNumeric (
	Expression : Object
) : boolean
Not applicable.

Parameters

Expression

Required. Object expression.

Return Value

Returns a Boolean value indicating whether an expression can be evaluated as a number.

For more detailed information, see the Visual Basic topic IsNumeric Function (Visual Basic).

IsNumeric returns True if the data type of Expression is Boolean, Byte, Decimal, Double, Integer, Long, SByte, Short, Single, UInteger, ULong, or UShort. It also returns True if Expression is a Char, String, or Object that can be successfully converted to a number.

IsNumeric returns False if Expression is of data type Date. It returns False if Expression is a Char, String, or Object that cannot be successfully converted to a number.

The following example uses the IsNumeric function to determine if the contents of a variable can be evaluated as a number.

Dim testVar As Object
Dim numericCheck As Boolean
testVar = "53"
' The following call to IsNumeric returns True.
numericCheck = IsNumeric(testVar)
testVar = "459.95"
' The following call to IsNumeric returns True.
numericCheck = IsNumeric(testVar)
testVar = "45 Help"
' The following call to IsNumeric returns False.
numericCheck = IsNumeric(testVar)

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0
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