printing to a file in a windows forms application---Visual Basic - vb.net

Question

So I'm coding a program in Visual Basic that gets the user to input book details (ISBN Number, Author ........) and then prints the details to a file. I have the following code which displays the form and all the input boxes however I'm clueless on where I need to place the code to print to a file.
The code to print to the file is as follows
FileOpen(1, "C:\test\testbook.txt", OpenMode.Append)
PrintLine(1, ISBN & " " & Author & " " & Title & " " & PageCount)
FileClose()
I tried placing it in the sub for the form but that didn't work. My question is where do I have to put this code in order for it to print to a file
Full code:
Public Class createBookform
Public ISBN, Author, Title As String
Public PageCount As Integer
Private Sub Form2_Load(sender As Object, e As EventArgs) Handles MyBase.Load
FileOpen(1, "C:\test\testbook.txt", OpenMode.Append)
PrintLine(1, ISBN & " " & Author & " " & Title & " " & PageCount)
FileClose()
End Sub
Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles TextBox1.TextChanged
ISBN = TextBox1.Text
End Sub
Private Sub TextBox3_TextChanged(sender As Object, e As EventArgs) Handles TextBox3.TextChanged
Author = TextBox3.Text
End Sub
Private Sub TextBox4_TextChanged(sender As Object, e As EventArgs) Handles TextBox4.TextChanged
Title = TextBox4.Text
End Sub
Private Sub TextBox2_TextChanged(sender As Object, e As EventArgs) Handles TextBox2.TextChanged
PageCount = TextBox2.Text
End Sub
Private Sub OKbUTTON_Click(sender As Object, e As EventArgs) Handles OKbUTTON.Click
MessageBox.Show("New book entered successfully", "Book confirmation")
Close()
End Sub
End Class
windows form that opens when code is executed

Answer 1

Unless if I'm missing something, do you just mean to do:
Public Class createBookform
Public ISBN, Author, Title As String
Public PageCount As Integer
Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles TextBox1.TextChanged
ISBN = TextBox1.Text
End Sub
Private Sub TextBox3_TextChanged(sender As Object, e As EventArgs) Handles TextBox3.TextChanged
Author = TextBox3.Text
End Sub
Private Sub TextBox4_TextChanged(sender As Object, e As EventArgs) Handles TextBox4.TextChanged
Title = TextBox4.Text
End Sub
Private Sub TextBox2_TextChanged(sender As Object, e As EventArgs) Handles TextBox2.TextChanged
PageCount = TextBox2.Text
End Sub
Private Sub OKbUTTON_Click(sender As Object, e As EventArgs) Handles OKbUTTON.Click
FileOpen(1, "C:\test\testbook.txt", OpenMode.Append)
PrintLine(1, ISBN & " " & Author & " " & Title & " " & PageCount)
FileClose()
MessageBox.Show("New book entered successfully", "Book confirmation")
Close()
End Sub
End Class
?
Typically, you wouldn't bother with the variables or the TextChanged events at all, and you would just use this:
Public Class createBookform
Private Sub OKbUTTON_Click(sender As Object, e As EventArgs) Handles OKbUTTON.Click
FileOpen(1, "C:\test\testbook.txt", OpenMode.Append)
PrintLine(1, TextBox1.Text & " " & TextBox3.Text & " " & TextBox4.Text & " " & TextBox2.Text)
FileClose()
MessageBox.Show("New book entered successfully", "Book confirmation")
Close()
End Sub
End Class
And to make it clearer, you would rename your text boxes something that makes sense (e.g., txbISBN for the ISBN text box).