You should create a struct which can hold your product info like this:
struct Product
{
public string Name;
public int ProductID;
}
Then you can create a list of your product like this
List<Product> products = new List<Product>(){new Product () {Name="a", ProductID=1}, new Product(){Name="b", ProductID=2}};
comboProducts.DataSource = products;
comboProducts.DisplayMember = "Name";
comboProducts.ValueMember = "ProductID";
Hope this helps