Different ways of Reading a file in C#

Here, we are reading two different files −

Reading text file −

Example

 Live Demo

using System; using System.IO; namespace FileApplication {    class Program {       static void Main(string[] args) {          try {             using (StreamReader sr = new StreamReader("d:/new.txt")) {                string line;                // Read and display lines from the file until                // the end of the file is reached.                while ((line = sr.ReadLine()) != null) {                   Console.WriteLine(line);                }             }          } catch (Exception e) {             // Let the user know what went wrong.             Console.WriteLine("The file could not be read:");             Console.WriteLine(e.Message);          }          Console.ReadKey();       }    } }

Output

The file could not be read: Could not find a part of the path "/home/cg/root/4281363/d:/new.txt".

Reading binary file −

Example

using System.IO; namespace BinaryFileApplication {    class Program {       static void Main(string[] args) {          BinaryWriter bw;          BinaryReader br;          int i = 25;          double d = 3.14157;          bool b = true;          string s = "I am happy";          //create the file          try {             bw = new BinaryWriter(new FileStream("mydata", FileMode.Create));          } catch (IOException e) {             Console.WriteLine(e.Message + "
 Cannot create file.");             return;          }          //writing into the file          try {             bw.Write(i);             bw.Write(d);             bw.Write(b);             bw.Write(s);          } catch (IOException e) {             Console.WriteLine(e.Message + "
 Cannot write to file.");             return;          }          bw.Close();          //reading from the file          try {             br = new BinaryReader(new FileStream("mydata", FileMode.Open));          } catch (IOException e) {             Console.WriteLine(e.Message + "
 Cannot open file.");             return;          }          try {             i = br.ReadInt32();             Console.WriteLine("Integer data: {0}", i);             d = br.ReadDouble();             Console.WriteLine("Double data: {0}", d);             b = br.ReadBoolean();             Console.WriteLine("Boolean data: {0}", b);             s = br.ReadString();             Console.WriteLine("String data: {0}", s);          } catch (IOException e) {             Console.WriteLine(e.Message + "
 Cannot read from file.");             return;          }          br.Close();          Console.ReadKey();       }    } }