File String Operations

//how to create a text file dynamically            

using System.IO;

string fileLoc = @"c:\sample1.txt";

            FileStream fs = null;

            if (!File.Exists(fileLoc))

            {

                using (fs = File.Create(fileLoc))

                {

                }

            }

(or)

string fileLoc = @"c:\sample1.txt";

FileStream fs= File.Create(fileLoc);

            

//writing to a text file

string fileLoc = @"c:\sample1.txt";

          

              

              

          if (File.Exists(fileLoc))//writing a file

          {

              using (StreamWriter sw = new StreamWriter(fileLoc))

             {

                  sw.Write("Some sample text for the file");

              }

          }

//To Open and read the content from file…

using (StreamReader sr = File.OpenText(path))

            {

                string s = "";

                while ((s = sr.ReadLine()) != null)

                {

String s=””;

S=sr.ReadLine();

}

}

//Read from file

if (File.Exists(fileLoc))

            {

                using (TextReader tr = new StreamReader(fileLoc))

                {

                    MessageBox.Show(tr.ReadLine());

                }

            }

//copy a file

string fileLocCopy = @"d:\sample1.txt";

            if (File.Exists(fileLoc))

            {

                // If file already exists in destination, delete it.

                if (File.Exists(fileLocCopy))

                    File.Delete(fileLocCopy);

                File.Copy(fileLoc, fileLocCopy);

            }

//Move a File

 string fileLocMove = @"d:\sample1" + System.DateTime.Now.Ticks + ".txt";

            if (File.Exists(fileLoc))

            {

                File.Move(fileLoc, fileLocMove);

            }

//Delete a file

if (File.Exists(fileLoc))

            {

                File.Delete(fileLoc);

            }

// Example #1: Write an array of strings to a file.

// Create a string array that consists of three lines.

            string[] lines = { "First line", "Second line", "Third line" };

            System.IO.File.WriteAllLines(fileLoc, lines);

// Example #3: Write only some strings in an array to a file.

            using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\Users\Public\TestFolder\WriteLines2.txt"))

            {

                foreach (string line in lines)

                {

                    if (line.Contains("Second") == false)

                    {

                        file.WriteLine(line);

                    }

                }

            }

// Example #4: Append new text to an existing file

            using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\Users\Public\TestFolder\WriteLines2.txt", true))

            {

                file.WriteLine("Fourth line");

            }