Adding a Button to Calculate Days Between

• Add a new column called DaysBetween, and set it's format to "5CN" - for more info on formating see:formatting

public class DemoLocalColumns : UIControllerBase
{
    public readonly DateColumn FromDate = new DateColumn("From Date");
    public readonly DateColumn ToDate = new DateColumn("To Date");
    public readonly NumberColumn DaysBetween = new NumberColumn("Days Between","5CN");

    public DemoLocalColumns()
    {
    }
  ...
} 

• Add the "DaysBetween" column to the screen
• Add a button called "Calc Days Between"
• Double click it to handle it's Click event

namespace Northwind.Training.SimpleScreen.Views
{
    partial class DemoLocalColumnsView : Shared.Theme.Controls.Form
    {
        DemoLocalColumns _controller;
        public DemoLocalColumnsView(DemoLocalColumns controller)
        {
            _controller = controller;
            InitializeComponent();
        }

        private void button1_Click(object sender, ButtonClickEventArgs e)
        {
            _controller.DaysBetween.Value = _controller.ToDate - _controller.FromDate;
        }
    }
} 

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