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SecureString Constructor

Initializes a new instance of the SecureString class.

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

public SecureString()

ExceptionCondition
CryptographicException

An error occurred while encrypting or decrypting the value of this instance.

NotSupportedException

This operation is not supported on this platform.

Windows 2000 Platform Note: SecureString is only supported on Windows 2000 Service Pack 3 and later.

The following example uses the default (or parameterless) constructor to instantiate a new SecureString object. It then calls the AppendChar method to add an array of characters to it.

using System;
using System.Security;

public class Example
{
   public static void Main()
   {
      // Define the string value to assign to a new secure string. 
      char[] chars = { 't', 'e', 's', 't' };
      // Instantiate the secure string.
      SecureString testString = new SecureString();
      // Assign the character array to the secure string. 
      foreach (char ch in chars)
         testString.AppendChar(ch);      
      // Display secure string length.
      Console.WriteLine("The length of the string is {0} characters.", 
                        testString.Length);

   }
}
// The example displays the following output: 
//      The length of the string is 4 characters.

The following example creates a SecureString object from the value of a String object.

using System;
using System.Security;

public class Example
{
   public static void Main()
   {
      // Define the string value to be assigned to the secure string. 
      string initString = "TestString";
      // Instantiate the secure string.
      SecureString testString = new SecureString();
      // Use the AppendChar method to add each char value to the secure string. 
      foreach (char ch in initString)
         testString.AppendChar(ch);

      // Display secure string length.
      Console.WriteLine("The length of the string is {0} characters.", 
                        testString.Length);
   }
}
// The example displays the following output: 
//      The length of the string is 10 characters.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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