Dynamic buttons in vb.net using for loop - vb.net

Question

I want to deal with the arrangement of the buttons. for example i have 10 buttons, i want that after 5 buttons the next 5 buttons will go to the nextline.
Here is the code that i have used:
For i = 1 To 10
Dim btn As New Button
btn.Width = 40
btn.Height = 30
btn.TextAlign = ContentAlignment.MiddleCenter
If i.ToString.Length = 1 Then
btn.Text = "B" & "0" & i
Else
btn.Text = "B" & i
End If
btn.Visible = True
btn.Tag = "Button" & i
Panel1.Controls.Add(btn)
If i <= 5 Then
btn.Location = New Point(10 * 1 + ((i - 1) * btn.Width), 10)
Else
btn.Location = New Point(10 * 1 + ((i - 1) * btn.Width), 10 * 1 + ((i - 1) * btn.Height))
End If
i get the wrong positioning of the buttons. kindly help me on this.
i always get this kind of position. ex:
* * * * *
*
*
*
*
*
What i want is this:
* * * * *
* * * * *
additional: How can i do it with backgroundworker...?

Answer 1

Assuming you are using winforms, instead of trying to position your buttons by hand, I would suggest you use a FlowLayoutPanel control instead of a straight up panel. Then you can just add them and let the panel manage their positions.
For i = 1 to 10
Dim btn As New Button
btn.Width = 40
btn.Height = 30
btn.TextAlign = ContentAlignment.MiddleCenter
If i.ToString.Length = 1 Then
btn.Text = "B" & "0" & i
Else
btn.Text = "B" & i
End If
btn.Visible = True
btn.Tag = "Button" & i
FlowLayoutPanel1.Controls.Add(btn)
Next
If you must have 5 per line (assuming your panel is wide enough), you can use SetFlowBreak:
For i = 1 to 10
'.....
FlowLayoutPanel1.Controls.Add(btn)
'Use this line if you must have only 5 buttons per line.
if i Mod 5 = 0 Then FlowLayoutPanel1.SetFlowBreak(btn, true)
Next

Answer 2

Try this:
If i <= 5 Then
btn.Location = New Point(10 * 1 + ((i - 1) * btn.Width), 10)
Else
btn.Location = New Point(10 * 1 + ((i - 6) * btn.Width), 10 + btn.Height)
End If
EDIT:
If you wanted to change the loop so that you wanted to multiple lines of buttons then look at this:
Dim noOfButtonsPerLine As Integer = 5
Dim buttonIndex As Integer = 0
Dim y As Integer = 10
For i = 1 To 15
Dim btn As New Button With {.Height = 40, .Width = 30}
If buttonIndex = noOfButtonsPerLine Then
buttonIndex = 1
y += btn.Height
Else
buttonIndex += 1
End If
btn.TextAlign = ContentAlignment.MiddleCenter
If i.ToString.Length = 1 Then
btn.Text = "B" & "0" & i
Else
btn.Text = "B" & i
End If
btn.Visible = True
btn.Tag = "Button" & i
Panel1.Controls.Add(btn)
btn.Location = New Point(10 * 1 + ((buttonIndex - 1) * btn.Width), y)
Next
Change the variable noofButtonsPerLine to what suits you. I've gone for 5 as per the question but you can change it and it should adapt.