I've made something like that:

private void comboBox1_SelectedIndexChanged(object sender, System.EventArgs
e)

{

CurrencyManager cm = (CurrencyManager)
this.BindingContext[((ComboBox)sender).DataSource];

DataRow dr = ((DataRowView) cm.Current).Row;

MessageBox.Show( dr[0].ToString());

}

comboBox1 is binded like this:

DataTable dt = new DataTable("table");

DataColumn ix = new DataColumn("ix",System.Type.GetType("System.String"));

DataColumn iy = new DataColumn("iy",System.Type.GetType("System.String"));

DataRow dr ;

dt.Columns.Add(ix);

dt.Columns.Add(iy);

dr = dt.NewRow();

dr[0] = "asterix";

dt.Rows.Add(dr);

dr = dt.NewRow();

dr[0] = "abladabla";

dt.Rows.Add(dr);

comboBox1.DataSource = dt;

comboBox1.DisplayMember = "ix";

The result is that if I choose abladabla from combobox, the sterix value is
displayed in a messagebox -> The last selected row is returned by the code
in SelectedIndexChanged. Don't know how to make this work "normal". Simply:
I choose asterix -> it displays asterix, I choose abladabla or whatsoever,
it displays it.