>>>>>>OTOH maybe just setting the TextBox.Multiline = true ?
>>>>>
>>>>>Bingo!
>>>>>That was the answer, Viv.
>>>>>I tried that and it gave me what I needed.
>>>>>It's interesting that when Multiline is set to false, the carriage returns disappear, but they're preserved when it's set to true. I'm sure that there's some logic there, but it escapes me.
>>>>>That gave me me what I needed to separate the amounts.
>>>>>Thanks, Viv
>>>>
>>>>Glad it was so easy :-}
>>>
>>>
>>>Here's another question, Viv
>>>
>>>

>>>string[] moneylines = Regex.Split(frmCounting.textBoxDemoninations.Text, "\r\n");
>>>workingprocessds.depdetail[0].ones = Convert.ToDecimal(moneylines[0].TrimEnd().TrimStart());
>>>workingprocessds.depdetail[0].twos = Convert.ToDecimal(moneylines[1].TrimEnd().TrimStart());
>>>workingprocessds.depdetail[0].fives = Convert.ToDecimal(moneylines[2].TrimEnd().TrimStart());
>>>workingprocessds.depdetail[0].tens = Convert.ToDecimal(moneylines[3].TrimEnd().TrimStart());
>>>workingprocessds.depdetail[0].twentys = Convert.ToDecimal(moneylines[4].TrimEnd().TrimStart());
>>>workingprocessds.depdetail[0].fiftys = Convert.ToDecimal(moneylines[5].TrimEnd().TrimStart());
>>>workingprocessds.depdetail[0].hundreds = Convert.ToDecimal(moneylines[6].TrimEnd().TrimStart());
>>>workingprocessds.depdetail.AcceptChanges();
>>>

>>>This code successfully parses the text into the 7 correct denominations.
>>>
>>>For testing, I activate this code by pressing a command button.
>>>Is there any way that I can force this code to be activated automatically after the multiline textbox is filled?
>>
>>What type of TextBox - Winforms, Web, WPF ?
>>How does it get populated ?
>
>It's a Winform textbox.
>
>It is populated when someone puts the cursor in the upper lefthand corner and runs a currency counting machine attached to a serial port on the PC.
>The serial stream is read by proprietary software that converts it into simulated keystrokes.
>When reading the stream the textbox behaves exactly as it would if a human keyed in a quantity and hit Enter, and repeated that keystroke combination 6 more times.
>
>The appearance of the screen is identical and so is the value to the text.property of the textbox.
>
>If there is no quantity for a denomination, it sends a zero followed by Enter, so there are always 7 quantities and 7 Enters.

Maybe watching OnTextChanged would work ? e.g:

protected override void OnTextChanged(EventArgs e)
        {
            if (this.Text.Count(t => t == '\n' ) == 7)
            {
                DoConversion(this.Text);
                this.Text = String.Empty;
            }

            base.OnTextChanged(e);
        }

You could create a custom control sub-classed from Textbox if you are using it in more than one place.....