DOUBT IN CONSOLE APPLICATION.

try this

using System;
using nsClearConsole;

namespace ConsoleApplication1
{
///

/// Summary description for Class1.
///

class Class1
{
///

/// The main entry point for the application.
///

[STAThread]
static void Main(string[] args)
{
ClearConsole ClearMyConsole = new ClearConsole();
Console.WriteLine("THIS IS FIRST LINE"); // Some text
Console.WriteLine("THIS IS SECOND LINE"); // Some text
Console.WriteLine("THIS IS THIRD LINE"); // Some text
Console.WriteLine("THIS IS FOURTH LINE"); // Some text
Console.WriteLine("THIS IS FIFTH LINE"); // Some text
Console.WriteLine("Hit Enter to Clear"); // Some text
Console.ReadLine(); // Wait for user input
ClearMyConsole.Clear(); // Clear the screen
Console.WriteLine("THE CONSOLE WAS CLEARED"); // Some text to clear console
Console.WriteLine("Hit Enter to Terminate"); //Some text
Console.ReadLine(); // Wait for user input

}
}
}


and this is the class that contain the nsClearConsole namespace ::

using System;
using System.Runtime.InteropServices;

namespace nsClearConsole
{
///

/// Summary description for ClearConsole.
///

public class ClearConsole
{
private const int STD_OUTPUT_HANDLE = -11;
private const byte EMPTY = 32;

[StructLayout(LayoutKind.Sequential)]
struct COORD
{
public short x;
public short y;
}

[StructLayout(LayoutKind.Sequential)]
struct SMALL_RECT
{
public short Left;
public short Top;
public short Right;
public short Bottom;
}

[StructLayout(LayoutKind.Sequential)]
struct CONSOLE_SCREEN_BUFFER_INFO
{
public COORD dwSize;
public COORD dwCursorPosition;
public int wAttributes;
public SMALL_RECT srWindow;
public COORD dwMaximumWindowSize;
}

[DllImport("kernel32.dll", EntryPoint="GetStdHandle", SetLastError=true, CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]
private static extern int GetStdHandle(int nStdHandle);

[DllImport("kernel32.dll", EntryPoint="FillConsoleOutputCharacter", SetLastError=true, CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]
private static extern int FillConsoleOutputCharacter(int hConsoleOutput, byte cCharacter, int nLength, COORD dwWriteCoord, ref int lpNumberOfCharsWritten);

[DllImport("kernel32.dll", EntryPoint="GetConsoleScreenBufferInfo", SetLastError=true, CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]
private static extern int GetConsoleScreenBufferInfo(int hConsoleOutput, ref CONSOLE_SCREEN_BUFFER_INFO lpConsoleScreenBufferInfo);

[DllImport("kernel32.dll", EntryPoint="SetConsoleCursorPosition", SetLastError=true, CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]
private static extern int SetConsoleCursorPosition(int hConsoleOutput, COORD dwCursorPosition);

private int hConsoleHandle;

public ClearConsole()
{
//
// TODO: Add constructor logic here.
//
hConsoleHandle = GetStdHandle(STD_OUTPUT_HANDLE);
}

public void Clear()
{
int hWrittenChars = 0;
CONSOLE_SCREEN_BUFFER_INFO strConsoleInfo = new CONSOLE_SCREEN_BUFFER_INFO();
COORD Home;
Home.x = Home.y = 0;
GetConsoleScreenBufferInfo(hConsoleHandle, ref strConsoleInfo);
FillConsoleOutputCharacter(hConsoleHandle, EMPTY, strConsoleInfo.dwSize.x * strConsoleInfo.dwSize.y, Home, ref hWrittenChars);
SetConsoleCursorPosition(hConsoleHandle, Home);
}
}
}

It's not possible at all in VS 2003.

They promised to add that capability to VS 2005, but don't know if they did.