event handling for composite controls

Hi Experts,

I am trying to build a windows form composite control. As of now the composite control only has one text box. In the contianing client (another windows form) I would like to be able to access the value entered in the textbox.

Should I create a event to be triggered when focus leaves the composite control (the text box for now). How do I do that?

Is there any other way to deal with this?

thanks in advance
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ol muserTechnology GeneralistAsked:
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Mike TomlinsonMiddle School Assistant TeacherCommented:
You either directly publicly expose the TextBox (not recommended), or create a Public property to access the Text() property of the TextBox contained within.  So you just basically "wrap" the Text() property of the TextBox in your own Property at the UserControl level.
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ol muserTechnology GeneralistAuthor Commented:
Hi @idle_mind, thanks. I am sorryif I was not clear, but I am able to access the text box value as a public property of the composite control, but my current challenge is this. If it were a regular text box I would use the leave event of the control to check if the value has changed or not and update the underlying business model. Here I need a event to do the same. This is thinking along the lines of what I currently have. What other option is there with a composite control? thanks
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ol muserTechnology GeneralistAuthor Commented:
Come to think of it, I could use some events like, when the form is closed or when the save button is clicked, for now, but I would like to understand how events are done in composite controls, thanks
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Mike TomlinsonMiddle School Assistant TeacherCommented:
Not sure what you're after here...

This is an example of raising a custom "leave" event for the UserControl when the TextBox's Leave() event fires:
    public partial class UserControl1 : UserControl
    {

        public delegate void TextBoxLeaveDelegate(Object sender);
        public event TextBoxLeaveDelegate TextBoxLeave;

        public string TextBoxValue
        {
            get { return textBox1.Text; }
        }

        public UserControl1()
        {
            InitializeComponent();
        }

        private void textBox1_Leave(object sender, EventArgs e)
        {
            if (TextBoxLeave != null)
            {
                TextBoxLeave(this);
            }
        }

    }

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