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June 28, 2016

Why is null not allowed for DateTime in C#?

DateTime is a value-type (struct), where-as string is a reference-type (class etc). That is the key difference. 

A reference can always be null; a value can't (unless it uses Nullable<T> - i.e. DateTime?), although it can be zero'd (DateTime.MinValue), which is often interpreted as the same thing as null 

C# that causes null DateTime error

using System;

class Program
    static void Main()
 DateTime current = null;


error CS0037: Cannot convert null to 'DateTime'
because it is a non-nullable value type

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