How do I read line by line using visual basic?

Written by jaime avelar
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How do I read line by line using visual basic?
(Pixland/Pixland/Getty Images)

Knowing how to read a text file is almost a requirement in the programming world. Microsoft Visual Basic is a programming language that can be used to develop programs and manipulate data in files. It’s useful to know how to read a text file line-by-line when you need to transfer the data to another file or display it in your program. In a few steps, you can write Visual Basic code to read all the lines in a text file.

Skill level:
Easy

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Instructions

  1. 1

    Start Microsoft Visual Basic 2010 Express and click the “File” menu then select “New Project…”. Click “Windows Forms Application” and select “OK.”

  2. 2

    Open Notepad and type the following:

    this is line 1 this is line 2 this is line 3 this is line 4 this is line 5

    Save the file to “C:\” as “readLines.txt.”

  3. 3

    Click “Toolbox” and double-click “Button” to add a new button to “Form 1.” Double-click “Button 1” to open the “Form1.vb” module.

  4. 4

    Type “Imports System.IO” in the very first line of “Form1.vb.” Type the following to declare your variables inside “Private Sub Button1_Click”:

    Dim text File As File Dim file Reader As System.IO.StreamReader Dim line Read As String

  5. 5

    Type the following to open the “readLines.txt” file:

    file Reader = textFile.OpenText("C:\readLines.txt")

  6. 6

    Type the following to loop through all the lines in “readLines.txt” and display the results in a message box:

    While fileReader.Peek <> -1 line Read = fileReader.ReadLine() MsgBox(lineRead) End While

  7. 7

    Type the following to close the file:

    fileReader.Close()

    Press “F5” to run your program and click “Button 1” to execute your code.

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