how can i restrict the text in rich text box using c#.net

[Anil Veeraghattapu 4]

Hi I am developing a windows application using c#.net in my application i have two rich textbox controls if the user enters some text in the rich text box, after the rich text box is completed he should redirect to the second rich text box that is when ever the text in the first rich text box is completed scroll bar should not be visible instead he should be directed to second rich text box i have to achieve this by with out considering the number of lines and character count for a rich text box i have to limit the content in the rich text box to the text which is displayed to the user only. can any body suggest me how to achieve this ?? Thanks Anil Veeraghattapu