null (C# Reference)
Visual Studio 2005
The null keyword is a literal that represents a null reference, one that does not refer to any object. null is the default value of reference-type variables.
C# 2.0 introduces nullable types, which are data types that may be set to an undefined value. See Nullable Types (C# Programming Guide).
For more information, see the following sections in the C# Language Specification:
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2.4.4.6 The null literal
Reference
C# KeywordsLiteral Keywords (C# Reference)
Concepts
C# Programming GuideOther Resources
C# ReferenceDefault Values Table (C# Reference)