C#

Ennis Ray Lynch, Jr. wrote:

Especially since subtracting hours may not work on days with leap seconds or 25 hours.

Ennis Ray Lynch, Jr. wrote:

A correctly implemented DateTime class should require subtracting 25 hours on the switchover date or 23 depending on the Calender. Which is why one should subtract days and not hours.

Ennis Ray Lynch, Jr. wrote:

My original comment was in jest suggesting that a good programmer would subtract a day instead of 24 hours; hoping that the parody would drive the point home.

Your original comment:

Especially since subtracting hours may not work on days with leap seconds or 25 hours.

Ennis Ray Lynch, Jr. wrote:

My reply to you was to point out that it is entirely possible to come across a 23 or 25 hour day in an implementation.

Your reply:

A correctly implemented DateTime class should require subtracting 25 hours on the switchover date or 23 depending on the Calender. Which is why one should subtract days and not hours.

Ennis Ray Lynch, Jr. wrote:

Of course, your reply will once again ignore the point I was trying to make so I don't know why I bother.

teknolog123 wrote:

something is missing

private void button1_Click(object sender, EventArgs e)
{
  //accessing with this
  MainForm frm = new MainForm();
  frm.buttontext="sample";
} 

using System;
using System.Drawing;
using System.Windows.Forms;

public partial class FormMain : Form
{
    // These will probably already be in the .Designer.cs file
    MyControl myControl;
    Button button;

    public FormMain()
    {
        InitializeComponent();
        // Creating instance of control, this will probably be done for you already in InitializeComponent.
        myControl = new MyControl();
        // Event subscription
        myControl.SetTextRequest += myControl_SetTextRequest;
        button = new Button();
        Controls.Add(button);
        button.Click += button_Click;
    }

    void button_Click(object sender, EventArgs e)
    {
        myControl.PerformSetTextRequest("Button");
    }

    void myControl_SetTextRequest(object sender, EventArgs<string> e)
    {
        // Respond to event
        button.Text = e.Value;
    }
}

public class MyControl : Control
{
    public event EventHandler<EventArgs<string>> SetTextRequest;

    protected virtual void OnSetTestRequest(EventArgs<string> e)
    {
        EventHandler<EventArgs<string>> eh = SetTextRequest;
        if (eh != null)
            eh(this, e);
    }

    // This method is for convenience only, event should be raised as required
    public void PerformSetTextRequest(string text)
    {
        OnSetTestRequest(new EventArgs<string>(text));
    }
}

// Custom event args - create your own class that does what you need!
public class EventArgs<T> : EventArgs
{
    public EventArgs(T value)
    {
        Value = value;
    }

    public T Value
    {
        get;
        private set;
    }
}