Convert a text file to uppercase

Write a program in C# to read a text file and make a copy in another file by changing the lowercase letters to uppercase.

Input

Output

Solution

using System.IO;
public class ConvertTextFileToUppercase
{
    public static void Main(string[] args)
    {
        string inputFileName = "input.txt";
        string outputFileName = "output.txt";
 
        string contents = File.ReadAllText(inputFileName);
        contents = contents.ToUpper();
 
        File.WriteAllText(outputFileName, contents);
    }
}