C #. NET add text to existing files + create a new text file and write a string

Add text to an existing file:

using System;using System.IO;class Test{public static void Main(){// Create an instance of StreamWriter to write text to a file.// The using statement also closes the StreamWriter.using (StreamWriter sw = new StreamWriter("TestFile.txt")){// Add some text to the file.sw.Write("This is the ");sw.WriteLine("header for the file.");sw.WriteLine("-------------------");// Arbitrary objects can also be written to the file.sw.Write("The date is: ");sw.WriteLine(DateTime.Now);}}}

Create a new text file and write a string:

Using system; using system. io; public class texttofile {private const string file_name = "myfile.txt"; public static void main (string [] ARGs) {If (file. exists (file_name) // check whether the file exists. {console. writeline ("{0} already exists. ", file_name); return;} using (streamwriter Sw = file. createtext (file_name) {SW. writeline ("this is my file. "); Sw. writeline ("I can write ints {0} Or floats {1}, and so on. & quot;, 1, 4.2); Sw. close ();}}}