How do i get a field from a combo box

I have a c# application in which i need to get a field from a combo box.

See a table which i have loaded into a combo . (See table below)


What i want to grab are 2 fields  othercurrencycode   and  exchrate

Below is the script that does the Load and specifies the 2 fields  to get

  LoginDetails.exDataSource = GlobalConfig.Connection.GetExchRate_All();
  glTRANSCurrencyValue.DataSource = LoginDetails.exDataSource;
  glTRANSCurrencyValue.DisplayMember = "FullCodeName";
  glTRANSExchrateValue.DataBindings.Add(new System.Windows.Forms.Binding("Text", LoginDetails.exDataSource, "exchrate", true));
  glTRANSCurrencyValue.DataBindings.Add(new System.Windows.Forms.Binding("Text", LoginDetails.exDataSource, "othercurrencycode", true));

Below is short of the screen that shows the loaded Combo


The screen below shows that the Currency instaed is showing the ValueMember is showing the DisplayValue (see below)


what do i need to specify to get the USD  as the code at runtime and not the complete record

Thanks

Oluaky