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Convert.ToDouble Method (Single)

Converts the value of the specified single-precision floating-point number to an equivalent double-precision floating-point number.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public static double ToDouble(
	float value


Type: System.Single
The single-precision floating-point number.

Return Value

Type: System.Double
A double-precision floating-point number that is equivalent to value.

The following example converts a Single value to a Double value.

		public void CovertDoubleFloat(double doubleVal) {	
			float floatVal = 0;

			// Double to float conversion cannot overflow.
				floatVal = System.Convert.ToSingle(doubleVal);
				System.Console.WriteLine("{0} as a float is {1}",
					doubleVal, floatVal);

			// Conversion from float to double cannot overflow.
			doubleVal = System.Convert.ToDouble(floatVal);
			System.Console.WriteLine("{0} as a double is: {1}",
				floatVal, doubleVal);

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.