Distinct Clause (Visual Basic)
Restricts the values of the current range variable to eliminate duplicate values in subsequent query clauses.
You can use the Distinct clause to return a list of unique items. The Distinct clause causes the query to ignore duplicate query results. The Distinct clause applies to duplicate values for all return fields specified by the Select clause. If no Select clause is specified, the Distinct clause is applied to the range variable for the query identified in the From clause. If the range variable is not an immutable type, the query will only ignore a query result if all members of the type match an existing query result.
The following query expression joins a list of customers and a list of customer orders. The Distinct clause is included to return a list of unique customer names and order dates.
Dim customerOrders = From cust In customers, ord In orders _ Where cust.CustomerID = ord.CustomerID _ Select cust.CompanyName, ord.OrderDate _ Distinct