Nullable Types in c# 2.0
Nullable types are instances of the System.Nullable struct, which helps value type (int , float etc..) to hold null value. This scenario comes when you are dealing with database and database software support null under value type but not front end language(c#, vb.net). c# 2.0 introduce nullable types to enable value types to hold null value;
Syntax:
int num1 = null; // Invalid
int? num1 = null; // Valid
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