/// <summary>
    /// Specifies what security should be applied to messages exchanges during a Session.
    /// </summary>
    [Description("Specifies what security should be applied to messages exchanges during a Session.")]
    [Flags]
    public enum UAMessageSecurityModes
    {
        /// <summary>
        /// No security mode is specified.
        /// </summary>
        [Description("No security mode is specified.")]
        None = 0,
 
        /// <summary>
        /// No security is applied.
        /// </summary>
        [Description("No security is applied.")]
        SecurityNone = 1,
 
        /// <summary>
        /// All messages are signed but not encrypted.
        /// </summary>
        [Description("All messages are signed but not encrypted.")]
        SecuritySign = 2,
 
        /// <summary>
        /// All messages are signed and encrypted.
        /// </summary>
        [Description("All messages are signed and encrypted.")]
        SecuritySignAndEncrypt = 4,
 
        /// <summary>
        /// Any mode that is secure.
        /// </summary>
        [Description("Any mode that is secure.")]
        Secure = SecuritySign | SecuritySignAndEncrypt,
 
        /// <summary>
        /// All possible security modes, including no security.
        /// </summary>
        [Description("All possible security modes, including no security.")]
        All = SecurityNone | SecuritySign | SecuritySignAndEncrypt,
    }
 

// This example shows how to subscribe to changes of multiple monitored items and display the value of the monitored item with 
// each change.
using OpcLabs.EasyOpc.UA;
using System;
 
namespace UADocExamples
{
    namespace _EasyUAClient
    {
        class SubscribeMultipleMonitoredItems
        {
            public static void Overload1()
            {
                // Instantiate the client object and hook events
                var easyUAClient = new EasyUAClient();
                easyUAClient.MonitoredItemChanged += easyUAClient_MonitoredItemChanged;
 
                Console.WriteLine("Subscribing...");
                easyUAClient.SubscribeMultipleMonitoredItems(new[]
                    {
                        new EasyUAMonitoredItemArguments(null, "http://localhost:51211/UA/SampleServer", 
                            "nsu=http://test.org/UA/Data/;i=10845", 1000),
                        new EasyUAMonitoredItemArguments(null, "http://localhost:51211/UA/SampleServer", 
                            "nsu=http://test.org/UA/Data/;i=10853", 1000),
                        new EasyUAMonitoredItemArguments(null, "http://localhost:51211/UA/SampleServer", 
                            "nsu=http://test.org/UA/Data/;i=10855", 1000)
                    });
 
                Console.WriteLine("Processing monitored item changed events for 10 seconds...");
                System.Threading.Thread.Sleep(10 * 1000);
 
                Console.WriteLine("Unsubscribing...");
                easyUAClient.UnsubscribeAllMonitoredItems();
 
                Console.WriteLine("Waiting for 5 seconds...");
                System.Threading.Thread.Sleep(5 * 1000);
            }
 
            static void easyUAClient_MonitoredItemChanged(object sender, EasyUAMonitoredItemChangedEventArgs e)
            {
                // Display value
                // Remark: Production code would check e.Exception before accessing e.AttributeData.
                Console.WriteLine("{0}: {1}", e.Arguments.NodeDescriptor, e.AttributeData.Value);
            }
        }
    }
}

var client = new EasyUAClient
{
     Isolated = true,
     IsolatedParameters = 
     { 
         Session = { UserIdentity = { UserNameToken = { UserName = "usr", Password = "pwd" }}}
     }
};

     var client = new EasyUAClient
     {
          Isolated = true,
          IsolatedParameters =
          {
               Session = { UserIdentity = 
                   { 
                        X509CertificateToken = { FileName = "...", Password = "..." } 
                   }
               }
          }
      };

 easyUAClient.SubscribeMonitoredItem(
                    "http://localhost:51211/UA/SampleServer",
                    "nsu=http://test.org/UA/Data/;i=10853",
                    1000);

// Shows how to obtain references of all kinds to nodes of all classes, from the "Server" node in the address space.
using System;
using System.Diagnostics;
using OpcLabs.EasyOpc.UA;
 
namespace UADocExamples
{
    namespace _EasyUAClient
    {
        class BrowseNodes
        {
            public static void Main()
            {
                // Instantiate the client object
                var easyUAClient = new EasyUAClient();
 
                // Obtain nodes under "Server" node
                UANodeElementCollection nodeElementCollection = easyUAClient.BrowseNodes(
                    "http://localhost:51211/UA/SampleServer", // or "opc.tcp://localhost:51210/UA/SampleServer"
                    UAObjectIds.Server,
                    new UABrowseParameters(UANodeClass.All, new [] { UAReferenceTypeIds.References } ));
 
                // Display results
                foreach (UANodeElement nodeElement in nodeElementCollection)
                {
                    Debug.Assert(nodeElement != null);
                    Console.WriteLine();
                    Console.WriteLine("nodeElement.NodeId: {0}", nodeElement.NodeId);
                    Console.WriteLine("nodeElement.DisplayName: {0}", nodeElement.DisplayName);
                }
            }
        }
    }
}