Best practice for sharing variables across forms in VB.NET

Question

I need to share variables across two forms in VB.NET. One of them is the main form and the other is a child form.

I have been searching, and I have found a few metho

Answer 1

Create two forms. Add 3 radio buttons and 1 button to form1. Add a label to form2. In the code for form1 type

    Public rdb As Integer = 1

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
     Form2.Show()
If RadioButton1.Checked Then
            rdb = 1
        ElseIf RadioButton2.Checked Then
            rdb = 2
        ElseIf RadioButton3.Checked Then
            rdb = 3
        End If
End Sub

Then in form2's code

Private Sub Form2_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Label1.Text = Form1.rdb
    End Sub