vb.net中，读取和写入文件

Question

点击一个按钮，能实现读取和写入功能（读取（写入）txt文档），请高手给我详细代码！

Answer 1

写入：Dim sr As New IO.StreamWriter(Application.StartupPath & "/写入的文本.txt")
sr.WriteLine("写入的内容") sr.Close()读取：If (File.Exists(Application.StartupPath & "/msg.txt")) Then
Dim fm As New IO.FileStream(Application.StartupPath & "/读取的文本.txt", FileMode.Open)
Dim sr As IO.StreamReader = New IO.StreamReader(fm)
Do While sr.Peek() >= 0
TextBox1.Text = sr.ReadLine() （读取文本到文本框）
Loop end if