CompareOrdinal Method (String, String)
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String.CompareOrdinal Method (String, String)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Compares two specified String objects by evaluating the numeric values of the corresponding Char objects in each string and returns an integer that indicates their relative position in the sort order.

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

public static int CompareOrdinal(
	string strA,
	string strB


Type: System.String
The first string to compare.
Type: System.String
The second string to compare.

Return Value

Type: System.Int32
An integer indicating the lexical relationship between the two comparands.



Less than zero

strA is less than strB.


strA and strB are equal.

Greater than zero

strA is greater than strB.

This method performs a case-sensitive comparison using ordinal sort rules. For more information about word, string, and ordinal sorts, see System.Globalization.CompareOptions.

Because CompareOrdinal is a static method, strA and strB can be null. If both values are null, the method returns 0 (zero), which indicates that strA and strB are equal. If only one of the values is null, the method considers the non-null value to be greater.

The following code example performs and ordinal comparison of two strings that only differ in case.

// Sample for String.CompareOrdinal(String, String)
using System;

class Example
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
      String str1 = "ABCD";
      String str2 = "abcd";
      String str;
      int result;

      outputBlock.Text += "\n";
      outputBlock.Text += "Compare the numeric values of the corresponding Char objects in each string." + "\n";
      outputBlock.Text += String.Format("str1 = '{0}', str2 = '{1}'", str1, str2) + "\n";
      result = String.CompareOrdinal(str1, str2);
      str = ((result < 0) ? "less than" : ((result > 0) ? "greater than" : "equal to"));
      outputBlock.Text += String.Format("String '{0}' is ", str1);
      outputBlock.Text += String.Format("{0} ", str);
      outputBlock.Text += String.Format("String '{0}'.", str2) + "\n";
This example produces the following results:

Compare the numeric values of the corresponding Char objects in each string.
str1 = 'ABCD', str2 = 'abcd'
String 'ABCD' is less than String 'abcd'.

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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