How to read the text file in C#.NET or VB.NET Windows Forms || StearmReader

Hi friends, in the previous article I explained about How to Create Text File or notepad file using C# and VB.NET.In this article I will explain about how to read the text file in C#.NET or VB.NET.

                         For this we are using StreamReader.StreamReader is a class.It reads the text. It found in System.IO namespace.
Let I explain using the examples.

1. The first program explain how to read the first line in the text file.

VB.NET:

Imports System.IO Imports System.Text Public Class Form2     Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load         Dim line As String         ' Create new StreamReader instance.         Dim reader As StreamReader = New StreamReader("c:\\temp\cid.txt")         ' Read one line from file         line = reader.ReadLine         ' Write the line we read from "cid.txt"         MessageBox.Show(line)     End Sub End Class

C#.NET:

using Microsoft.VisualBasic; using System; using System.Collections; using System.Collections.Generic; using System.Data; using System.Diagnostics; using System.IO; using System.Text; Public Class Form2 {      private void Form2_Load(System.Object sender, System.EventArgs e)      {                     // Create new StreamReader instance.           StreamReader reader = new StreamReader("c:\ temp\cid.txt");           // Read one line from file           line = reader.ReadLine();           // Write the line we read from "cid.txt"           MessageBox.Show(line);      }     Public Form2()      {           Load += Form2_Load;      } }

The above code will show the first line in the cid.txt as an alert.

2. The second program explain how to read all lines in the text file.

VB.NET:

Imports System.IO Imports System.Text Public Class Form2     Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load         Dim line As String, i As Integer         For Each line In File.ReadAllLines("c:\temp\column.txt")             ' Split line on comma             Dim parts As String() = line.Split(" ")             Dim swriter As StreamWriter             swriter = File.AppendText("c:\temp\CID.txt")             swriter.WriteLine(parts(0))             swriter.Close()             i += 1         Next     End Sub End Class

C# Code:

using Microsoft.VisualBasic; using System; using System.Collections; using System.Collections.Generic; using System.Data; using System.Diagnostics; using System.IO; using System.Text; Public Class Form2 {      private void Form2_Load(System.Object sender, System.EventArgs e)      {           string line = null;           int i = 0;           foreach (string line_loopVariable in File.ReadAllLines("c:\temp\column.txt")) {               line = line_loopVariable;               // Split line on comma               string[] parts = line.Split(" ");               StreamWriter swriter = null;               swriter = File.AppendText("c:\temp\CID.txt");               swriter.WriteLine(parts[0]);               swriter.Close();               i += 1;           }      }     Public Form2()      {           Load += Form2_Load;      } }

The above example shows how to read all the lines from the text file.

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