How do I update a binded textbox from C# code

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C#

Binding

I am working on a small WinForm project in VS 2010 C#, I created a Customer class with two properties (CusID & CusNm). And, I drew a ComboBox and a TextBox on a panel container drawn on the Form, (ComboBox for CusNm & TextBox from the CusID). I used two binding objects to bind the customer1.CusNm & customer1.CusID properties with the ComboBox and TextBox respectively, the two bindings went well, and the values of the customer.CusID and customer1.CusNm normally appear on the TextBox and the Combobox. But when I try to assign a value for the customer1.CusID in the code ( like:
customer1.CustID = 100; ) , the new value doesn't get reflected on the TextBox, and the old value (which is: 0 ) still stays in the TextBox. So, how can I make the TextBox get updated with the new value, when I assign it using C# code?

Thank you so much

What I have tried:

I reviewed the binding, but everything seems fine..

<br />
binding bdCusID = new binding ("Text", customer1,"CusID");<br />
TextBox1.bindings.add(bdCusID);<br />
customer1.CustID = 100; <br />
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