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    <p>You can use events for that.</p> <p>Booking action will fire an event that will indicate that a facility is booked.<br> Form1 will have an event handler registered to it and change the button's image to reflect the state of the facility.</p> <p><strong>Edit</strong> (how to do this with events):</p> <pre><code>public class FacilityStateChangeEventArgs : EventArgs { public FacilityStateChangeEventArgs(bool booked) { this.Booked = booked; } public bool Booked { get; protected set; } // ... other properties if you need them } public class Facility { private bool booked = false; public bool Booked { get { return this.booked; } protected set { if (this.booked == value) return; // Changes the state and fires the event. this.booked = value; FireChange(); } } public event EventHandler&lt;FacilityStateChangeEventArgs&gt; StateChange; // You will use this method when booked gets changed public void FireChange() { if (this.StateChange != null) this.StateChange(this, new FacilityStateChangeEventArgs(this.Booked)); } } // The form with the image button. public class FormWithButton { Button button1 = new Button(); public void Whatever() { // You will get the facility from your bussiness instances. Facility facility = new Facility(); facility.StateChange += new EventHandler&lt;FacilityStateChangeEventArgs&gt;(facility_StateChange); } void facility_StateChange(object sender, FacilityStateChangeEventArgs e) { if (e.Booked) button1.Image = null; // booked image else button1.Image = null; // free image } } </code></pre>
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    1. POChanging Button Image
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    1. USJaroslav Jandek
    1. USJaroslav Jandek
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    1. COThanks for the reply, how do i go about using this events and event handler?
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      1. USpacheco
    2. CO@pacheco: I have added code to my answer 3 weeks ago, you may have missed it.
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