C# > System.Security

C# > System.Security

• NET Framework security system
• provide access to authentication
• provide crytographic services
• control access to operations based on policy
• rights management of application-created content

Classes

• AccessControl

Dynamic Type C# Example

C# > Types > dynamic

The dynamic enables bypass compile-time type checking. These operations are resolved at run time. 

Example

dynamic dyn = 1;

object obj = 1;

var dyn_type = dyn.GetType(); // System.Int32

var obj_type = obj.GetType(); // System.Int32

dyn = dyn + 1; //Ok

obj = obj + 1; // Error    1      Operator '+' cannot be applied to operands of type 'object' and 'int'

Object Type C# Example

C# > Types > object

 You can assign values of any type to variables of type object. 

Example

object obj;

obj = 1; 

string type =  obj.GetType().Name; //Int32

   

obj = "string";

type = obj.GetType().Name; //String

Dns Get Host By Name C# Example

C# > System.Net > Dns

Retrieves information about a specific host from the Internet Domain Name System (DNS).

Example

  IPHostEntry hostInfo = Dns.GetHostByName("www.microsoft.com");

  string hostName = hostInfo.HostName;

  IPAddress[] addressList = hostInfo.AddressList;

  foreach (IPAddress ipAddress in addressList)

  {

              

  }

C# System.Net

C# > System.Net

Provides  programming interface for:

• network protocols
• cache policies
• e-mail
• network traffic data and network address information
• networking functionality

Classes:

• Dns

Namespaces

• NetworkInformation

STR SQL Server Example

SQL Server > Built-in Functions > STR

Converts number to varchar.

STR ( expression , length , decimal )

Example:

SELECT STR(123.45, 6, 1);

GO

result
 123.5

Assembly Class C# Example

C# > System > Reflection > Assembly

Assembly class:

• load assemblies
• explore the metadata 
• find the types contained in assemblies and to create instances of those types.

Example

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Reflection;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace WindowsFormsApplication27

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

            Assembly a = typeof(Form1).Assembly;

            MessageBox.Show(a.FullName);

        }

    }

}