使用泛型类型System.Collections.Generic.List 需要1个类型参数

i upgraded my application .Net Framework version from 3.5 to 4.5.1 and also i changed the targeted version from 3.5 to 4.5.1. my application using Linq to SQL.. in my application i am using Class Library and in class library i need to pass multiple parameters in Generic list...i upgraded my application .Net Framework versio