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String::ToLower Method

Updated: October 2008

Returns a copy of this String converted to lowercase, using the casing rules of the current culture.

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

String^ ToLower()

Return Value

Type: System::String
A String in lowercase.

This method takes into account the current culture. For more information, see the CultureInfo topic.


   This method does not modify the value of the current instance. Instead, it returns a new string in which all characters in the current instance are lowercased.

Security Considerations

If you need the lowercase or uppercase version of an operating system identifier, such as a file name, named pipe, or registry key, use the ToLowerInvariant or ToUpperInvariant methods.

The following example converts several mixed case strings to lowercase.

using namespace System;
using namespace System::Collections;
int main()
   array<String^>^info = {"Name","Title","Age","Location","Gender"};
   Console::WriteLine( "The initial values in the array are:" );
   IEnumerator^ myEnum = info->GetEnumerator();
   while ( myEnum->MoveNext() )
      String^ s = safe_cast<String^>(myEnum->Current);
      Console::WriteLine( s );

   Console::WriteLine( " {0}The lowercase of these values is:", Environment::NewLine );
   IEnumerator^ myEnum1 = info->GetEnumerator();
   while ( myEnum1->MoveNext() )
      String^ s = safe_cast<String^>(myEnum1->Current);
      Console::WriteLine( s->ToLower() );

   Console::WriteLine( " {0}The uppercase of these values is:", Environment::NewLine );
   IEnumerator^ myEnum2 = info->GetEnumerator();
   while ( myEnum2->MoveNext() )
      String^ s = safe_cast<String^>(myEnum2->Current);
      Console::WriteLine( s->ToUpper() );
// The example displays the following output: 
//       The initial values in the array are: 
//       Name 
//       Title 
//       Age 
//       Location 
//       Gender 
//       The lowercase of these values is: 
//       name 
//       title 
//       age 
//       location 
//       gender 
//       The uppercase of these values is: 
//       NAME 
//       TITLE 
//       AGE 
//       LOCATION 
//       GENDER

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

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

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0




October 2008

Added a note that the method returns a new String object.

Customer feedback.