C#

// Case.cs
public enum Case
{
    None,
    Upper,
    Lower,
    Proper
}

// FormChild.cs
using System;
using System.Drawing;
using System.Windows.Forms;

public partial class FormChild : Form
{
    #region Events

    public event EventHandler SelectedCaseChanged;

    #endregion

    #region Fields

    private Case selectedCase;

    /* Would normally be in the Designer.cs file */
    private RadioButton radioUpper;
    private RadioButton radioLower;
    private RadioButton radioProper;
    private Button buttonOK;
    private Button buttonCancel;

    #endregion

    #region Constructors

    public FormChild()
    {
        InitializeComponent();
        CustomInitialize();

        selectedCase = Case.None;
        radioUpper.Tag = Case.Upper;
        radioLower.Tag = Case.Lower;
        radioProper.Tag = Case.Proper;
    }

    #endregion

    #region Properties

    /* Public read only public property */
    public Case SelectedCase
    {
        get { return selectedCase; }
        private set
        {
            if (selectedCase != value)
            {
                selectedCase = value;
                OnSelectedCaseChanged(EventArgs.Empty);
            }
        }
    }

    #endregion

    #region Methods

    private void RadioButton_CheckedChanged(object sender, EventArgs e)
    {
        RadioButton selectedRadio = sender as RadioButton;
        if (sender != null)
            SelectedCase = (Case)selectedRadio.Tag;
    }

    protected virtual void OnSelectedCaseChanged(EventArgs e)
    {
        EventHandler eh = SelectedCaseChanged;
        if (eh != null)
            eh(this, e);
    }

    /* Creates all controls and sets properties
     * Would normally be in the Deisgner.cs file */
    private void CustomInitialize()
    {

        radioUpper = new RadioButton();
        radioLower = new RadioButton();
        radioProper = new RadioButton();
        buttonOK = new Button();
        buttonCancel = new Button();

        Text = "Child";
        Size = new Size(196, 152);
        FormBorderStyle = FormBorderStyle.FixedDialog;
        MaximizeBox = false;
        MinimizeBox = false;
        StartPosition = FormStartPosition.CenterParent;

        radioUpper.Text = "&Upper";
        radioLower.Text = "&Lower";
        radioProper.Text = "&Proper";
        radioUpper.Location = new Point(12, 12);
        radioLower.Location = new Point(12, 35);
        radioProper.Location = new Point(12, 58);

        buttonOK.Text = "OK";
        buttonCancel.Text = "Cancel";
        buttonOK.Location = new Point(93, 81);
        buttonCancel.Location = new Point(12, 81);

        Controls.AddRange(new Control[]{
                radioUpper,
                radioLower,
                radioProper,
                buttonOK,
                buttonCancel });

        CancelButton = buttonCancel;
        AcceptButton = buttonOK;
        buttonOK.DialogResult = DialogResult.OK;

        radioUpper.CheckedChanged += RadioButton_CheckedChanged;
        radioLower.CheckedChanged += RadioButton_CheckedChanged;
        radioProper.CheckedChanged += RadioButton_CheckedChanged;
    }

    #endregion
}

// FormParent.cs
using System;
using System.Drawing;
using System.Globalization;
using System.Windows.Forms;

public partial class FormParent : Form
{
    #region Fields

    FormChild formChild;

    /* Would normally be in the Designer.cs file */
    private TextBox textBox;
    private Button buttonSetCase;

    #endregion

    #region Constructors

    public FormParent()
    {
        InitializeComponent();
        CustomInitialize();
    }

    #endregion

    #region Methods

    private void buttonSetCase_Click(object sender, EventArgs e)
    {
        /* Normally you would use either read the property or
         * subscribe to the event, NOT both! */

        formChild = new FormChild();
        // Subscribe to the event in the child form.
        formChild.SelectedCaseChanged += new EventHandler(formChild_SelectedCaseChanged);
        if (formChild.ShowDialog(this) == DialogResult.OK)
            // Read property before disposing of the form.
            CaseText(formChild.SelectedCase);
        formChild.Dispose();
        formChild = null;
    }

    private void formChild_SelectedCaseChanged(object sender, EventArgs e)
    {
        FormChild childForm = sender as FormChild;
        if (childForm != null)
            CaseText(childForm.SelectedCase);
    }

    private void CaseText(Case selectedCase)
    {
        TextInfo textInfo = CultureInfo.CurrentCulture.TextInfo;
        switch (selectedCase)
        {
            case Case.Upper:
                textBox.Text = textInfo.ToUpper(textBox.Text);
                break;
            case Case.Lower:
                textBox.Text = textInfo.ToLower(textBox.Text);
                break;
            case Case.Proper:
                textBox.Text = textInfo.ToTitleCase(textBox.Text);
                break;
        }
    }

    /* Creates all controls and sets properties
     * Would normally be in the Deisgner.cs file */
    private void CustomInitialize()
    {
        textBox = new TextBox();
        buttonSetCase = new Button();

        Text = "Parent";
        Size = new Size(221, 83);

        textBox.Location = new Point(12, 14);
        buttonSetCase.Location = new Point(118, 12);
        buttonSetCase.Text = "&Set Case";

        Controls.AddRange(new Control[] {
            textBox,
            buttonSetCase });

        AcceptButton = buttonSetCase;
        buttonSetCase.Click += buttonSetCase_Click;
    }

    #endregion
}

for (int i=0; i<MatchCollection1.Count; i++) {
    Console.WriteLine(matchCollection1[i].Value);
    Console.WriteLine(matchCollection2[i].Value);
}

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