For Each Statement doesn't access all controls

[WomanPro]

Hello everyone,
I am having a picture box on my form named pb and I am adding buttons through runtime, however I need a process for removing all buttons that belong to the pb collection, but for each statement removes one less object-button. Any suggestions please??? Any help would me much appreciated. Thank you so much in advanced.

Public Class Form1
Dim Btn1 As New Button
Dim btn2 As New Button
Dim btn3 As New Button
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Btn1.SetBounds(100, 200, 76, 27)
Btn1.Name = "button1"
btn2.BackColor = Color.Aqua
btn2.SetBounds(50, 100, 76, 27)
btn2.Name = "button2"
btn3.BackColor = Color.Green
btn3.SetBounds(300, 100, 76, 27)
btn3.Name = "button3"
pb.Controls.Add(Btn1)
pb.Controls.Add(btn2)
pb.Controls.Add(btn3)
End Sub

Private Sub Remove_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Remove.Click
For Each obj As Button In Me.pb.Controls
pb.Controls.Remove(obj)
Next

End Sub

 

[jebenson]

This will remove all the buttons in the picture box:

For i As Integer = PictureBox1.Controls.Count - 1 To 0 Step -1

    If TypeOf PictureBox1.Controls(i) Is Button Then

        PictureBox1.Controls.Remove(PictureBox1.Controls(i))

    End If

Next

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[Jasen]

The problem with the original code was that "pb.Controls" is a collection. You want to avoid modifying a collection as you're walking through it in a for/each loop or you end up with unexpected results, as you saw.