C#

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;
    }
}

Saba Minhas wrote:

like PIA flight Information System,or any shop or school or railway system

Saba Minhas wrote:

This is not my degrees final project,this is semester project.So it should be little smaal

Christian Graus wrote:

but people who ask clueless questions, then don't answer when people try to help them.