通过另一种形式更新文本文件中的一行

Question

I have a form that has MenuScripts (top-levels and second-levels).

The problem that I am having is one of the second-levels is "Add" which brings you to another form . This form has a button 'Record' and textboxes . This form allows the user to input data and when the record button is clicked, the inputted data is written to a text file.

Back to the first form. Another second-level MenuScript is "Update" which brings the user to the same form as "Add"; but first, the user has to click an item within a listbox to proceed.

How do I get the data from the selected item to appear in the appropriate textboxes and how do I get the 'Record' button to update data instead of thinking it is only an add-data button?

Also, if someone can give me some pointers on making sure the user selects an item within the listbox would definitely be a plus!

Unfortunately, I cannot add images since my reputation is too low.

Here is a visual representation of my ultimate goal

Answer 1

To access the control in another form, you could prefix the formname to the control name(name of the control in the other form).

Example:

Form2.TextBox1.Text = "Hey, this is the second form"

To check whether an item is selected, you could do this way:

    If ListBox1.SelectedItems.Count = 0 Then
        MessageBox.Show("Please select an item")
    Else
        MessageBox.Show("Thanks for selecting an item")
    End If

Or, this way:

    If ListBox1.SelectedIndex = -1 Then
        MessageBox.Show("Please select an item")
    Else
        MessageBox.Show("Thanks for selecting an item")
    End If