Convert.ToBoolean Method (String)


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Converts the specified string representation of a logical value to its Boolean equivalent.

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

public static bool ToBoolean(
	string value


Type: System.String

A string that contains the value of either Boolean.TrueString or Boolean.FalseString.

Return Value

Type: System.Boolean

true if value equals TrueString, or false if value equals FalseString or null.

Exception Condition

value is not equal to TrueString or FalseString.

For a successful conversion to occur, the value parameter must equal either Boolean.TrueString, a constant whose value is True, Boolean.FalseString, a constant whose value is False, or it must be null. In comparing value with Boolean.TrueString and Boolean.FalseString, the method ignores case as well as leading and trailing white space.

If you prefer not to handle an exception if the conversion fails, you can call the Boolean.TryParse method instead. It returns a Boolean value that indicates whether the conversion succeeded or failed.

The following example uses the Convert.ToBoolean(String) method to convert various strings to Boolean values.

using System;

public class BooleanConversion
   public static void Main()
      String[] values = { null, String.Empty, "true", "TrueString", 
                          "False", "    false    ", "-1", "0" };
      foreach (var value in values) {
            Console.WriteLine("Converted '{0}' to {1}.", value,  
         catch (FormatException)
            Console.WriteLine("Unable to convert '{0}' to a Boolean.", value);
// The example displays the following output:
//       Converted '' to False.
//       Unable to convert '' to a Boolean.
//       Converted 'true' to True.
//       Unable to convert 'TrueString' to a Boolean.
//       Converted 'False' to False.
//       Converted '    false    ' to False.
//       Unable to convert '-1' to a Boolean.
//       Unable to convert '0' to a Boolean.

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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