C# | String.ToLowerInvariant Method Last Updated : 21 Nov, 2022 Comments Improve Suggest changes Like Article Like Report 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: C# // C# program to illustrate // ToLowerInvariant() method using System; class GFG { // Main method static public void Main() { // variables 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); } } Output: String before ToLowerInvariant: WelCome tO GeeKSfOrGeeKs String after ToLowerInvariant: welcome to geeksforgeeks Example 2: C# // 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 string into Lowercase // using ToLowerInvariant() method value = value.ToLowerInvariant(); // Display the Lowercase strings Console.WriteLine("String 2: {0}", value); } } 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 give you compile-time error. Reference: https://docs.microsoft.com/en-us/dotnet/api/system.string.tolowerinvariant?view=netframework-4.7.2 Comment More infoAdvertise with us Next Article C# | String.ToLowerInvariant Method ankita_saini Follow Improve Article Tags : C# CSharp-method CSharp-string Similar Reads C# Tutorial C# (pronounced "C-sharp") is a modern, versatile, object-oriented programming language developed by Microsoft in 2000 that runs on the .NET Framework. 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