Check out example codes for "how to change a string into lowercase in C#". It will help you in understanding the concepts better.

Code Example 1

/* Take an Input */
string str = Console.ReadLine();

/* Convert to Lower and store it in a itself
That means update the str variable and store it in itself. */
str = str.ToLower();

/* Print it. */

/* Input:-
Hello World */
/* Output:-
hello world */

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