Need Little help

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;


namespace FileData
{
    class Program
    {
        DateTime date = new DateTime();
        DateTime time = new DateTime();

        string name;
        public void Inputdata()
        {
            FileStream fs = new FileStream("C:\\Data.txt",FileMode.Append,FileAccess.Write,FileShare.Write);
            StreamWriter sw = new StreamWriter(fs);

            Console.WriteLine("Enter the date in format {dd/mm/yyyy} :: ");
            date = DateTime.Parse(Console.ReadLine());
            sw.WriteLine("-------------------------------------------");
            sw.WriteLine("Date :: "+date);
           

            Console.WriteLine("Enter the name of the person you want to meet :: ");
            name = Console.ReadLine();
            sw.WriteLine("Name of the person :: "+name);
           

            Console.WriteLine("Enter the your visit time in format {HH:MM:SS} :: ");
            time = DateTime.Parse(Console.ReadLine());
            sw.WriteLine("Visit time :: "+time);
            sw.WriteLine("-------------------------------------------\n");
            sw.Close();
           // sw.Flush();
            fs.Close();
        }
        public void Displaydata()
        {
            FileStream fs1 = new FileStream("C:\\Data.txt", FileMode.Open, FileAccess.Read, FileShare.Read);
            StreamReader sr = new StreamReader(fs1);
            sr.BaseStream.Seek(0, SeekOrigin.Begin);

            string r1 = sr.ReadLine();
            Console.WriteLine("File Data :: \n");
            //Console.WriteLine("\n");
            while (r1 != null)
            {
                Console.WriteLine("{0}", r1);
                
                r1 = sr.ReadLine();
            
            }
           // Console.WriteLine(r1);

            sr.Close();
            fs1.Close();
        }

        public void search()
        {
            string fName = @"C:\Data.txt ";
            StreamReader testTxt = new StreamReader(fName);
            string allRead = testTxt.ReadToEnd();
             
            Console.WriteLine("Enter the date in format {dd/mm/yyyy} :: ");
            DateTime search1 = new DateTime(); 
            string s =  search1.ToString(Console.ReadLine());
            
       
            if (allRead.Contains(s))
            {
               Console.WriteLine("Found");
             
            }
            else
            {
                Console.WriteLine("not found");
            }

            testTxt.Close();
        }
        static void Main(string[] args)
        {
            Program p = new Program();
          

            Console.WriteLine("1. Enter a data into file  ");
            Console.WriteLine("2. View the data from file  ");
            Console.WriteLine("3. Search according to date  ");
            Console.WriteLine("4. Exit \n");
            Console.WriteLine("Enter your choice :: ");
            int a = Convert.ToInt32(Console.ReadLine());

            switch (a)
            {

                case 1: p.Inputdata();
                    break;
                case 2: p.Displaydata();
                    break;
                case 3: p.search();
                    break;
                case 4: System.Environment.Exit(0);
                    break;

                default: Console.WriteLine("Please enter the correct choice");
                    break;
            }

            Console.ReadLine();
        }
    }
}