tx.cs

private bool RemoveEmptyFieldLines()
{
    foreach (IFormattedText obj in serverTextControl1.TextParts)
    {
        foreach (ApplicationField field in obj.ApplicationFields)
        {
            // check, if character next to empty field is a carriage return
            if (obj.TextChars[field.Start + field.Length].Char == '\n')
            {
                bool bCompleteLine =
                    (field.Start == obj.Lines.GetItem(field.Start).Start)
                    ? true : false;

                // if yes, remove the field
                obj.Selection.Start = field.Start;
                obj.ApplicationFields.Remove(field, false);

                // if the field is the only text in the line
                // remove the CR
                if (bCompleteLine)
                {
                    obj.Selection.Length = 1;
                    obj.Selection.Text = "";
                }

                // call RemoveEmptyFieldLines recursively
                return true;
            }
            else
                field.Text = "";
        }
    }

    return false;
}