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ToUpper();

ToUpper(); function in C#
This function is used to convert the string into uppercase character.
Example

using System;

namespace program

{
    class Program
    {
        static void Main(string[] args)
        {
            string str1= "hello";
            string str5 = str1.ToUpper();
            Console.WriteLine(str5);  
            Console.ReadKey();
        }     
    }
 }

Output
HELLO