If ComboBox equals an item on the list then do this? - vb.net

Question

I'm doing a program on Visual Basic Community 2017, that has a serious of ComboBoxes with various dropdown items. If there is a certain combination of the Comboboxes, then open this form. How would I implement this?
E.g
ComboBox1 items (string) = 1, 2, 3 ,4 ,5
ComboBox2 items (string) = a, b, c, d, e
ComboBox 3 items (string)= A, B, C, D, E
The user picks 1,a,A
Clicks a button
Then Show form 1
Thanks, I hope it makes enough sense.
The code I tried was
Public Class Form2
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
If ComboBox1.SelectedText.ToString() = "1" And ComboBox2.SelectedText.ToString() = "a" And ComboBox3.SelectedText.ToString() = "A" Then
Then
Form1.Show()
Else
MsgBox("Doesn't Work")
End If
End Sub
End Class

Answer 1

Following is example code based on your case. Hope this can help you.
Public Class Form2
Dim selectedItem1, selectedItem2, selectedItem3 As Object
Private Sub ComboBox2_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBox2.SelectedIndexChanged
showForm1()
End Sub
Private Sub ComboBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBox1.SelectedIndexChanged
showForm1()
End Sub
Private Sub ComboBox3_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBox3.SelectedIndexChanged
showForm1()
End Sub
Private Sub showForm1()
selectedItem1 = ComboBox1.SelectedItem
selectedItem2 = ComboBox2.SelectedItem
selectedItem3 = ComboBox3.SelectedItem
If selectedItem1 Is Nothing OrElse selectedItem2 Is Nothing OrElse selectedItem3 Is Nothing Then
Exit Sub
End If
If ((selectedItem1.ToString() = "1") AndAlso (selectedItem2.ToString() = "a") AndAlso (selectedItem3.ToString() = "A")) Then
Form1.Show()
End If
End Sub
Private Sub Form2_Load(sender As Object, e As EventArgs) Handles MyBase.Load
' your code to initialize items of ComboBox1, ComboBox2, ComboBox3
End Sub
End Class