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Returns the smallest integral value that is greater than or equal to the specified double-precision floating-point number.

**Namespace:**System

**Assembly:**mscorlib (in mscorlib.dll)

#### Parameters

- d
- Type: System..::..Double

A double-precision floating-point number.

#### Return Value

Type: System..::..DoubleThe smallest integral value that is greater than or equal to d. If d is equal to NaN, NegativeInfinity, or PositiveInfinity, that value is returned. Note that this method returns a Double instead of an integral type.

The behavior of this method follows IEEE Standard 754, section 4. This kind of rounding is sometimes called rounding toward positive infinity. In other words, if d is positive, the presence of any fractional component causes d to be rounded to the next highest integer. If d is negative, the rounding operation causes any fractional component of d to be discarded. The operation of this method differs from the Floor(Double) method, which supports rounding toward negative infinity.

- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see dd66cd4c-b087-415f-9c3e-94e3a1835f74.