Getting new line in wpf - wpf

Question

i am having arraylist.let say it contains 15 elements. I am adding these to stack panel. I need to add 3 elements per line. my code is below. I am getting either horizontal or verrtical.Let me know how to do this.
MainWindow w;
public ShopCart(MainWindow m,ArrayList _list)
{
InitializeComponent();
w = m;
int i = 1;
foreach (string cartitems in _list)
{
mystackpanel.Orientation = Orientation.Horizontal;
mystackpanel.Margin.Left.Equals(150);
Label lbl = new Label();
lbl.Name = "Label" + i;
lbl.Height = 30;
lbl.Width = 200;
lbl.Margin.Left.Equals(150);
//lbl.Margin.Top.Equals(150);
lbl.Content = cartitems.ToString();
mystackpanel.Children.Add(lbl);
i++;
int str = mystackpanel.Children.Count;
MessageBox.Show(Convert.ToString(str));
if (str%3 == 0)
{
Button btndelete = new Button();
btndelete.Content = "Delete";
btndelete.Width = 120;
btndelete.Height = 35;
mystackpanel.Children.Add(btndelete);
mystackpanel.Margin.Top.Equals(500);
}
}

Answer 1

Here is some sample code(assuming you already have a list of buttons, and will add outer stack panel to your main control) you can try, you may need to change few things as per your need:
List<Button> buttons = new List<Button>();
StackPanel panel = new StackPanel();
panel.Orientation = Orientation.Horizontal;
int count = 0;
StackPanel innerPanel = new StackPanel();
innerPanel.Orientation = Orientation.Vertical;
foreach (Button button in buttons)
{
innerPanel.Children.Add(button);
++count;
if (count % 3 == 0 && count != 0)
{
panel.Children.Add(innerPanel);
innerPanel = new StackPanel();
innerPanel.Orientation = Orientation.Vertical;
}
}
if (panel.Children.Contains(innerPanel) == false)
{
panel.Children.Add(innerPanel);
}
Although in my opinion the best way will be to have a Grid with n*n row and columns and add your buttons to respective row, columns.