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Char.CompareTo Method (Object)

Compares this instance to a specified object and indicates whether this instance precedes, follows, or appears in the same position in the sort order as the specified Object.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

Public Function CompareTo ( _
	value As Object _
) As Integer


Type: System.Object

An object to compare this instance to, or Nothing.

Return Value

Type: System.Int32
A signed number indicating the position of this instance in the sort order in relation to the value parameter.

Return Value


Less than zero

This instance precedes value.


This instance has the same position in the sort order as value.

Greater than zero

This instance follows value.


value is Nothing.




value is not a Char object.

The CompareTo method implements the IComparable interface.

The value parameter must be Nothing or an instance of Char; otherwise, an exception is thrown.

The comparison performed by this method is based on the encoded values of this instance and value, not necessarily their lexicographical characteristics. Any instance of Char, regardless of its value, is considered greater than Nothing.

The following code example demonstrates CompareTo.

Imports System

Module CompareToSample

    Sub Main()

        Dim chA As Char
        chA = "A"c
        Dim chB As Char
        chB = "B"c

        Console.WriteLine(chA.CompareTo("A"c))  ' Output: "0" (meaning they're equal)
        Console.WriteLine("b"c.CompareTo(chB))  ' Output: "32" (meaning 'b' is 32 greater than 'B')
	Console.WriteLine(chA.CompareTo(chB))	' Output: "-1" (meaning 'A' is less than 'B' by 1)

    End Sub 

End Module

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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