How to write to a text file in VB.NET

We can StreamWriter class to write to a file. The Write method is used to write to a text file.

In the StreamWriter constructor, the first parameter is the file name and second parameter is optional, boolean type. If second parameter is true, an existing file will be appended with new text. Otherwise it will erase old text and start with new text.

Module Module1

    Sub Main()

        Dim fileName As String = "C:\Mahesh\McTextFile.txt"

        Using reader As New System.IO.StreamReader(fileName)

            While Not reader.ReadLine() Is Nothing

                Console.WriteLine(reader.ReadLine())

            End While

        End Using

        Try

            Using writer As New System.IO.StreamWriter(fileName, True)

                writer.WriteLine("New text")

                writer.WriteLine("New text line goes here")

            End Using

        Catch ex As Exception

        End Try

        Console.ReadKey()

    End Sub

End Module