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Customer cust = new Customer("Joe", null);

/* Add null value */

DataRow row = statesTable.NewRow();

/* Enter a null row (ComboBox will show blank) */

row["Name"] = "";

row["Code"] = DBNull.Value;

/* Add the row to DataTable */

statesTable.Rows.Add(row);

/* Bind the States ComboBox to the states DataTable */

this.statesCB.DisplayMember = "Name";

this.statesCB.ValueMember = "Code";

this.statesCB.DataSource = statesTable;

/* Bind the ComboBox SelectedValue to the customer */

/* business object */

this.statesCB.DataBindings.Add("SelectedValue", cust, "StateID", true);