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Definition of DL. 1  DL is short for down-low, which basically means to keep things under-wraps, to keep a secret or lay low. 2  I'll tell you this, but, you gotta promise to keep it on the DL. D.L. means down low. it means that something is not known to all. if you keep something on the D.L... 2  you don't share it with others. 3  I don't want my Dad to find out, so keep it on the D.L. 4  She like me but keep that on the DL.
Generic Types. Generics are the most powerful feature of C# 2.0. It allows defining type-safe data structures, without committing to actual data types. In C# 1.0 we can either declare reference type or value type. But in most of the application we come across situation where we need type that can hold both reference & value type.