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File handling concept in C#:-

The file is a collection of records, It is used to store information permanently under the client machine.

C# provides IO namespace to perform the file handling task.

Operation on File:-


1)  Write File:-

It is used to save the record on file

using System.IO;

class FileHandlingOperation
    {
        public static void Main()
        {
            File.WriteAllText("D://mydemo.txt", "Welcome in File Handling");
            Console.ReadKey();
        }
    }

2)  Read File

class FileHandlingOperation
    {
        public static void Main()
        {
           String s= File.ReadAllText("D://mydemo.txt");
           Console.WriteLine(s);
            Console.ReadKey();
        }
    }

3)  Append File Operation:-


    class FileHandlingOperation
    {
        public static void Main()
        {
            File.AppendAllText("D://mydemo.txt", "Welcome in File Handling");
            Console.ReadKey();
        }
    }


Another Example of File Handling Operation:-

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
namespace Project2
{
    class FileHandlingOperation
    {
        string data = "";
        void CreateFile()
        {
           FileStream fs= File.Create("D://mydata1.txt");
           fs.Close();
            
        }
        void WriteFile()
        {

          //  Console.WriteLine("Enter data");
          //  data = Console.ReadLine();
            File.WriteAllText("D://si.txt",data);
            float p = 50000, r=2, t=3, si;
             si = (p * r * t) / 100;
            File.WriteAllText("D://si.txt", "Result is "+si);

        }

        void ReadFile()
        {
            String s = File.ReadAllText("D://mydata.txt");
            Console.WriteLine(s);
        }

        void AppendFile()
        {
            Console.WriteLine("Enter data");
            data = Console.ReadLine();
            File.AppendAllText("D://mydata.txt",data);

        }

        static void Main()
        {
            FileHandlingOperation obj = new FileHandlingOperation();
         //   obj.CreateFile();
              obj.WriteFile();
          //   obj.AppendFile();
            obj.ReadFile();
            Console.ReadKey();
        }

    }
}

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