Custom Events |Modal and Modeless Forms|Steve Robinson

Creating Custom Events in C#:

//Great for Sending back values from modal forms

http://www.dreamincode.net/forums/topic/176796-quick-and-easy-custom-events/

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//Example application: Uses both Modal and Modeless Forms to show the use of Custom Events and Event Handlers.

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//I have just included the Partial Classes of Main form, FirstNameForm and LastNameForm.

//Form1.cs


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
            Form2 FirstNameForm = new Form2();
            FirstNameForm.FirstNameUpdated += new EventHandler<Form2.UpdatedArguments>(FirstNameForm_FirstNameUpdated);
            FirstNameForm.Show();
        }

        void FirstNameForm_FirstNameUpdated(object sender, Form2.UpdatedArguments e)
        {
            if (e != null)
                this.label4.Text = e.FirstName;
        }

        private void getlastname_Click(object sender, EventArgs e)
        {
            Form3 LastNameForm = new Form3();
            if (LastNameForm.ShowDialog() == DialogResult.OK)
                this.label3.Text = LastNameForm.LastName;
        }



    }
}

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//Form2.cs -Modeless
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

    //Creating of EventArgs for the custom Event
        public class UpdatedArguments : EventArgs
        {
            private string firstName;

            public string FirstName
            {
                get { return firstName; }
                set { firstName = value; }
            }
        }

    //Creation of Event
        public event EventHandler<UpdatedArguments> FirstNameUpdated;

    //Function that raises the Event and broadcasts it to the Classes or Forms
        private void eventRaiser(UpdatedArguments e)
        {

            if (FirstNameUpdated != null)
                FirstNameUpdated(this, e);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            UpdatedArguments newEvent = new UpdatedArguments();
            newEvent.FirstName = this.textBox2.Text;
            eventRaiser(newEvent);
        }
    }
}

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//Form3.cs -Modal
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }


    String Property that wraps the TextBox property.
        public string LastName
        {
            get { return this.textBox1.Text; }
        }

    //Sends OK Dialog Status
        private void button1_Click(object sender, EventArgs e)
        {
            this.DialogResult = DialogResult.OK;
        }
    }
}