ToBoolean Method (Double)

# Convert.ToBoolean Method (Double)

.NET Framework 3.0
Converts the value of the specified double-precision floating point number to an equivalent Boolean value.

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

## Syntax

```public static bool ToBoolean (
double value
)
```
```public static boolean ToBoolean (
double value
)
```
```public static function ToBoolean (
value : double
) : boolean
```
```Not applicable.
```

#### Parameters

value

A double-precision floating point number.

#### Return Value

true if value is not zero; otherwise, false.

## Example

The following code sample illustrates the use of the ToBoolean method, taking a Double as a parameter.

```public void ConvertDoubleBool(double doubleVal) {
bool    boolVal;
// Double to bool conversion cannot overflow.
boolVal = System.Convert.ToBoolean(doubleVal);
System.Console.WriteLine("{0} as a Boolean is: {1}.",
doubleVal, boolVal);

// bool to double conversion cannot overflow.
doubleVal = System.Convert.ToDouble(boolVal);
System.Console.WriteLine("{0} as a double is: {1}.",
boolVal, doubleVal);
}

```
```public void ConvertDoubleBool(double doubleVal)
{
boolean boolVal;

// Double to bool conversion cannot overflow.
boolVal = System.Convert.ToBoolean(doubleVal);
System.Console.WriteLine("{0} as a Boolean is: {1}.",
System.Convert.ToString(doubleVal),
System.Convert.ToString(boolVal));

// bool to double conversion cannot overflow.
doubleVal = System.Convert.ToDouble(boolVal);
System.Console.WriteLine("{0} as a double is: {1}.",
System.Convert.ToString(boolVal),
System.Convert.ToString(doubleVal));
} //ConvertDoubleBool

```

## Platforms

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

## Version Information

#### .NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

#### .NET Compact Framework

Supported in: 2.0, 1.0

#### XNA Framework

Supported in: 1.0