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In this article. To use the new constraint the type cannot be abstract. Find Other Words There S Really No Other Option Most Shoppers Won T Go Past The First 3 5 Pages Of Search Results So That Really Only Words Sayings Keywords Apply the new constraint to a type parameter when a generic class creates new instances of the type as shown in the following example. . The new constraint specifies that a type argument in a generic class or method declaration must have a public parameterless constructor.