Filling a combobox, getting a value from combobox

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C#

Hi,

I am building a software in visual C# 2005 (it's my first experience). I use this code to fill a combobox:

DataSet ds = new DataSet();
SqlDataAdapter adapter = new SqlDataAdapter("Select CUSTOMER_ID,NAME from CUSTOMERS group by CUSTOMER_ID,NAME", conn);
adapter.Fill(ds);
comboBox1.DataSource = ds.Tables[0].DefaultView;
comboBox1.DisplayMember = "NAME";
comboBox1.BindingContext = this.BindingContext;

Everything is fine. The combobox is filled and only the name of the customer is shown. That's what I wanted.
But when I implement a search button, I want to put as a part of query the CUSTOMER_ID. So the combobox of the customers is clicked and after the search button is clicked I want to produce all the data that correspond to the customer name which was clicked but taking in consideration not the name that was shown in the combobox, but the customer_ID of that name.

May you help me?
Thank you