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Convert.ToBoolean Method (Object)

Converts the value of a specified object to an equivalent Boolean value.

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

public static bool ToBoolean(
	Object value


Type: System.Object
An object that implements the IConvertible interface, or null.

Return Value

Type: System.Boolean
true or false, which reflects the value returned by invoking the IConvertible.ToBoolean method for the underlying type of value. If value is null, the method returns false.


value is a string that does not equal TrueString or FalseString.


value does not implement the IConvertible interface.


The conversion of value to a Boolean is not supported.

The following example converts an array of object values to Boolean values.

object[] objects = { 16.33, -24, 0, "12", "12.7", String.Empty, 
                     "1String", "True", "false", null, 
                     new System.Collections.ArrayList() };

foreach (object obj in objects)
   Console.Write("{0,-40}  -->  ", 
                 obj != null ? 
                 String.Format("{0} ({1})", obj, obj.GetType().Name) : 
   try {
      Console.WriteLine("{0}", Convert.ToBoolean(obj));
   catch (FormatException) {
      Console.WriteLine("Bad Format");
   catch (InvalidCastException) {
      Console.WriteLine("No Conversion");
// The example displays the following output:
//       16.33 (Double)                            -->  True
//       -24 (Int32)                               -->  True
//       0 (Int32)                                 -->  False
//       12 (String)                               -->  Bad Format
//       12.7 (String)                             -->  Bad Format
//        (String)                                 -->  Bad Format
//       1String (String)                          -->  Bad Format
//       True (String)                             -->  True
//       false (String)                            -->  False
//       null                                      -->  False
//       System.Collections.ArrayList (ArrayList)  -->  No Conversion

.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.