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C# | String.ToLowerInvariant Method
  • Last Updated : 01 Feb, 2019

String.ToLowerInvariant Method is used to get a copy of this String object converted to lowercase using the casing rules of the invariant culture. Here, “invariant culture” represents a culture that is culture-insensitive.

Syntax:

public string ToLowerInvariant ();

Return value: The return type of this method is System.String. This method returns a string which is a lowercase equivalent of the current string.

Below given are some examples to understand the implementation in a better way:

Example 1:



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// C# program to illustrate 
// ToLowerInvariant() method
using System;
  
class GFG {
  
    // Main method
    static public void Main()
    {
  
        // varibles
        string strA = "WelCome tO GeeKSfOrGeeKs";
        string strB;
  
        // Convert strA into lowercase
        // using ToLowerInvariant() method
        strB = strA.ToLowerInvariant();
  
        // Display string before ToLowerInvariant() method
        Console.WriteLine("String before ToLowerInvariant:");
        Console.WriteLine(strA);
        Console.WriteLine();
  
        // Display string after ToLowerInvariant() method
        Console.WriteLine("String after ToLowerInvariant:");
        Console.WriteLine(strB);
    }
}

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Output:

String before ToLowerInvariant:
WelCome tO GeeKSfOrGeeKs

String after ToLowerInvariant:
welcome to geeksforgeeks

Example 2:

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// C# program to illustrate
// ToLowerInvariant() Method
using System;
  
public class GFG {
  
    // Main method
    static public void Main()
    {
        // calling function
        Convert("GEeks");
        Convert("geeks");
        Convert("GEEKS");
    }
  
    static void Convert(String value)
    {
  
        // Display  strings
        Console.WriteLine("String 1:  {0}", value);
  
        // Convert sting into Lowercase
        // using ToLowerInvariant() method
        value = value.ToLowerInvariant();
  
        // Display the Lowercase strings
        Console.WriteLine("String 2:  {0}", value);
    }
}

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Output:

String 1:  GEeks
String 2:  geeks
String 1:  geeks
String 2:  geeks
String 1:  GEEKS
String 2:  geeks

Note:

  • The invariant culture represents a culture that is culture-insensitive. It is associated with the English language but not with a specific country or region.
  • ToLowerInvariant() 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 converted to lowercase.
  • This method can’t be overloaded if you try to overload this method, it will gives you compile time error.

Reference: https://docs.microsoft.com/en-us/dotnet/api/system.string.tolowerinvariant?view=netframework-4.7.2

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