Save a (.txt) File On Form Closing

Things You'll Need
1 RichTextBox [RichTextBox1]

Select The Form_Closing Event

Type The Following Code:

Code:

Dim reply
        reply = MsgBox("Do you want to Save before you Exit?", 52)
        If reply = 6 Then
            Dim SFD As New SaveFileDialog
            With SFD
                .Filter = "Text Files (.txt)|*.txt"
                If .ShowDialog = Windows.Forms.DialogResult.OK Then

                    Dim SW As New IO.StreamWriter(.FileName)
                    For Each line As String In RichTextBox1.Lines
                        SW.WriteLine(line)
                    Next
                    SW.Flush()
                    SW.Close()
                End If
            End With
        Else
        End If

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This is all you need to do to save a (.txt) file when your form is closing.
To test your program, debug it then go to the location where you saved your file.