Bind a DataTable to ComboBox

Hi, I am trying to bind a DataTable as the DataSource of a ComboBox control. But it doesn't display the contents in my DataTable.
// cbWsRatePlans and cbWsPrefixes are two ComboBox controls
// wsRatePlans.Table and wsPrefixes.Table are two DataTable as DataSource
// In the Load event, I bind the DataSource

cbWsRatePlans.DataSource = wsRatePlans.Table;
cbWsRatePlans.DisplayMember = wsRatePlans.DisplayMember;
cbWsPrefixes.DataSource = wsPrefixes.Table;
cbWsPrefixes.DisplayMember = wsPrefixes.DisplayMember;

//........
// After that, I read the data from database and fill the data to wsRatePlans.Table and wsPrefixes.Table
// After the data loading, in the debug mode, I can see wsRatePlans.Table and wsPrefixes.Table has the data, so I try to update the combobox control in the Shown event.

cbWsRatePlans.Update();
cbWsPrefixes.Update();

I cannot see any data display in the combobox. Seems the data was not updated after I change the data table.

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please have a look into this

1. http://www.scriptslibrary.net/c-sharp/108-bind-an-adonet-datatable-to-a-combobox-in-c

2. http://www.akadia.com/services/dotnet_databinding.html

void FillComcoBox()
02.        {
03.            DataTable dt = new DataTable();
04.            String strconn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\Users\\Power\\Desktop\\db.mdb";
05.            OleDbConnection conn;
06.            OleDbDataAdapter da;
07.            try
08.            {
09.                conn= new OleDbConnection(strconn);
10.                da= new OleDbDataAdapter("Select * from Positions",conn);
11.                dt.Clear();
12.                da.Fill(dt);
13.                conn.Close();
14.                this.cbPositions.DataSource =dt;
15.                this.cbPositions.DisplayMember = "Position";
16. 
17.                this.cbPositions.ValueMember="ID";
18.            }
19.            catch ( Exception ex)
20.            {
21.                MessageBox.Show(ex.Message);
22. 
23.            }
24.        }
 
 
 
 
private void frm_Load(object sender, EventArgs e)
2.        {
3.            FillComcoBox();
4.        }

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Bind a DataTable to ComboBox

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