Vb.net text reader

By: Issac

StreamReader and StreamWriter are actually derived from Textreader and TextWriter, they are another way to read and write to a file but they are not stream classes.

Imports System.IO

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, _

ByVal e As System.EventArgs) Handles Button1.Click

        Try

            Dim line As String

            Dim readFile As System.IO.TextReader = New _

	StreamReader("C:\TextReader.txt")

            While True

                line = readFile.ReadLine()

                If line Is Nothing Then

                    Exit While

                Else

                    MsgBox(line)

                End If

            End While

            readFile.Close()

            readFile = Nothing

        Catch ex As IOException

            MsgBox(ex.ToString)

        End Try

    End Sub

End Class

When you execute this program the TextReader read the file line by line.

The following code reads the entire content in a file into string using TextReader.

imports System.IO

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, _

		ByVal e As System.EventArgs) Handles Button1.Click

        Try

            Dim line As String

            Dim readFile As System.IO.TextReader = New _

					StreamReader("C:\Test1.txt")

            line = readFile.ReadToEnd()

            MsgBox(line)

            readFile.Close()

            readFile = Nothing

        Catch ex As IOException

            MsgBox(ex.ToString)

        End Try

    End Sub

End Class