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DoubleIsNaN Method
Returns a value indicating whether the specified number evaluates to a value that is not a number (NaN).

Namespace: System
Assembly: mscorlib (in mscorlib.dll) Version: 4.0.0.0
Syntax
C#
public static bool IsNaN(
	double d
)

Parameters

d
Type: SystemDouble
A double-precision floating-point number.

Return Value

Type: Boolean
true if d evaluates to NaN; otherwise, false.
See Also