C#

<br />
public class ConsumerClass<br />
{<br />
    public ConsumerClass(ProviderClass Provider)<br />
    {<br />
        // calls the Protected internal function of any ProviderClass-derived class<br />
        Console.WriteLine(Provider.getProtIntVal());<br />
    }<br />
}<br />
public abstract class ProviderClass<br />
{<br />
    protected internal abstract string getProtIntVal();<br />
}<br />

<br />
public class DerivedProviderClass:ProviderClass<br />
{<br />
    public DerivedProviderClass()<br />
    {<br />
    }<br />
    protected override string getProtIntVal()<br />
    {<br />
        return "this is a string";<br />
    }<br />
}<br />
public class StartupClass<br />
{<br />
    [STAThread]<br />
    public static void Main(params string[] args)<br />
    {<br />
        DerivedProviderClass c = new DerivedProviderClass();<br />
        // Next will cause a compiler - Error<br />
        console.WriteLine(c.getProtIntVal());<br />
        // Next will work<br />
        ConsumerClass cons = new ConsumerClass(c);<br />
    }<br />
}<br />

<br />
<br />
using System;<br />
using System.Collections.Generic;<br />
using System.Text;<br />
<br />
namespace InternalAssembly<br />
{<br />
    public class BasicTaskClass<br />
    {<br />
        string str=null;<br />
<br />
<br />
        protected virtual void DoTask()<br />
        {<br />
            return;<br />
        }<br />
<br />
        internal void DoJob()<br />
        {<br />
         //codes for control and ...<br />
         this.DoTask();<br />
        }<br />
<br />
        protected internal string Data<br />
        {<br />
            get<br />
            {<br />
                //codes for other task and controls<br />
                return this.str;<br />
            }<br />
            set<br />
            {<br />
                //code for other tasks and controls<br />
                this.str = value;<br />
            }<br />
        }<br />
 <br />
     }<br />
<br />
<br />
   public sealed class DoTaskClass<br />
    {<br />
       public string Go(string str, BasicTaskClass tsk)<br />
       {<br />
           tsk.Data = str;<br />
           tsk.DoJob();<br />
           return tsk.Data;<br />
       }<br />
<br />
    }<br />
<br />
}<br />

</code>
using System;
using System.Collections.Generic;
using System.Text;

namespace InternalProtectedDemo
{
    class UpperCaseTask:InternalAssembly.BasicTaskClass
    {
        protected override void DoTask()
        {
            this.Data=this.Data.ToUpper();
        }
    }



    class Program
    {
        static void Main(string[] args)
        {
            InternalAssembly.DoTaskClass doTaskClass = new InternalAssembly.DoTaskClass();

            InternalAssembly.BasicTaskClass basicTask = new InternalAssembly.BasicTaskClass();

            basicTask.DoJob(); //produce error [comment it]

            Console.WriteLine(doTaskClass.Go("hello", new InternalAssembly.BasicTaskClass())); //output= hello
            Console.WriteLine(doTaskClass.Go("hello", new UpperCaseTask())); //output= HELLO

            Console.ReadKey();
        }
    }
}
</code>

SELECT * FROM yourtable WHERE Gender = 'M'
SELECT * FROM yourtable WHERE Gender = 'F'

<br />
public delegate void MidiCallBack(sometype someParameter);<br />

<br />
[DllImport("winmm.dll")]<br />
public static extern int midiInOpen(ref int lphMidiIn, int uDeviceID, [MarshalAs(UnmanagedType.FunctionPtr)]MidiCallBack dwCallback, int dwInstance, int dwFlags);<br />

<br />
private void MidiCallbackFunction(sometype someParameter)<br />
{<br />
    //doStuff<br />
}<br />

<br />
midiInOpen(ref hMidiIn, mMPU401IN, 0, new MidiCallBack(MidiCallbackFunction),0,0);<br />