how to display information from related t

hi
i have two table which has a one to many relationship.
one is Orders table and other Customer table.
Orders (fields) :OrderID(Key),OrderDate,....,CustomerID
Customers (fields) : CustomerID(key),CustomerName,...
and relation is in CustomerID column (CustomersTable Parent and Orders table child) .
i want to display orders in a datagrid and use a tamplate column which display some fields .
i use a label in template column to display Customer name from Customers table which is related to Current record.
plz help me how to do that which the labels have the related Customer name.
plzz help
thanks