Delegate Event

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Introduction

This is one simple example for handling delegate events. Delegate event one of the advance concept in c#.net. We can pass the values between two control by using delegate events.

In this artical we have to controls. one is top control and another one is bottom control. Below we can see, how to pass the values between two controls by using delegate events.

Top Control :

This control having one text box and one sibmit button. Now, we are going to create a event in the control to pass the text box value to another control.

Firest we have to create a event handler before the declaration of the class.

public delegate void TextEventHandler(Object sender, TextEventArgs e);

Second we have to create event args to pass these value.

public class TextEventArgs : EventArgs
{
private string text;
public TextEventArgs(string textValue)
{
text = textValue;
}
public string Text
{
get { return text; }
}
}
Third passing the value to the args.

TextEvent(this, new TextEventArgs(textBox1.Text));

Now, we can see. how to access these values from another control.

Bottom Control : In this control, just we have to initialize the event. how to initialize the event...

TopControl.TextEvent += new TextEventHandler(SetTextBox);

private void SetTextBox(object sender, DelegateEvents.TextEventArgs e)
{
textBox1.Text = e.Text;
}