Passing variables between windows forms in VS 2010

Question

I have two forms. Form 1 allows the user to pick an employee from a dropdown combo box. That employee is then passed onto Form 2 where the user enters additional information

Answer 1

Change your code in Form2.vb for the New sub to this:

Public Sub New(ByVal Employee As String)

    ' This call is required by the designer.

    InitializeComponent()

    ' Add any initialization after the InitializeComponent() call.

    MsgBox(Employee)

End Sub

If you don't call InitializeComponent(), your complete GUI is not going to render.

Answer 2

I am late but I think this answer can help.

For example, Form1 named "menu" opens and passes variable to Form2 named "ordine". The variable to pass is "hotel"

In menu on button_click

Dim ordinef As New Ordine()

If ordinef Is Nothing Then
    'control that form is not opened yet if open close before
    ordinef = New Ordine()
Else
    ordinef.Close()
    ordinef = New Ordine()
End If

ordinef.hotel = hotel

ordinef.Show()

In Form2 (Ordine):

Private Sub Ordine_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

public hotel as string

msgbox hotel

That's it!!

Answer 3

You don't even have to use the InitializeComponent or New functions.

I have made an example to show how easily this can be done.

Clicking "Show Form" results in the below:

Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
    Form2.Show()
End Sub

which is simply used to display the second form.

By clicking "Pass Data" results in the following code:

Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click
    Form2.Label1.Text = TextBox1.Text
End Sub

As shown above you can pass the data directly from control to control. The same idea can be used with variables too.