有人帮我解释vb.net的一段代码吗?!!!!
Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
SaveFileDialog1.ShowDialog()
savefile()
End Sub
Sub savefile()
SaveFileDialog1.Title = "文件保存"
SaveFileDialog1.Filter = "Rich Textfile|*.rch" & "Text.file|*.txt"
If SaveFileDialog1.ShowDialog = DialogResult.OK Then
If Trim(SaveFileDialog1.FileName) <> "" Then
RichTextBox1.SaveFile(SaveFileDialog1.FileName)
End If
End If
End Sub