C#

openFileDialog1.InitialDirectory = "c:\\" ;
openFileDialog1.Filter = "CSharp files (*.cs)|*.cs" ;
if (openFileDialog1.ShowDialog() == DialogResult.OK)
    {
       // do your work here
       //OpenFileDialog have properties and method that    wil let yo work with file like get file name,opern it..etc

    }
For More info look at <a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemwindowsformsopenfiledialogclasstopic.asp" rel="nofollow">OpenFileDialog Class</a>[<a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemwindowsformsopenfiledialogclasstopic.asp" target="_blank" rel="nofollow" title="New Window">^</a>]

const int WM_SYSCOMMAND  = 0x0112;
const int SC_CLOSE    =    0xF060;

protected override void WndProc(ref Message m)
{
	if(m.Msg==WM_SYSCOMMAND)
	{
		if(m.WParam.ToInt32()==SC_CLOSE)
		{
		      MessageBox.Show("Application will be close");
                       // call the default after you handle it			
                       base.WndProc(ref m);
		}
	}
	else
	{
		base.WndProc (ref m);
	}
}

protected override void WndProc(ref Message m)
{
	if(m.Msg==WM_SYSCOMMAND)
	{
		if(m.WParam.ToInt32()==SC_CLOSE)
		{
		      MessageBox.Show("Application will be close");
                }
			
	}
        base.WndProc (ref m);
}

Set objWMIServices=GetObject("winmgmts:{impersonationLevel=impersonate}!\\" & machineName & "\root\CIMV2")
 
set objSink = WScript.CreateObject("WbemScripting.SWbemSink","SINK_")
 
WScript.Echo "Starting Listeners... Win32_Process"
objWMIServices.ExecNotificationQueryAsync objSink, "SELECT * FROM __InstanceCreationEvent WITHIN 60 WHERE TargetInstance ISA 'Win32_Process'"
 
Sub SINK_OnObjectReady(wmiObject, wmiAsyncContext)
	Set objTargetInstance = objWMIServices.Get(wmiObject.Properties_("TargetInstance").Value.Path_.Path)
	WScript.Echo Now() & " - " & objTargetInstance.GetObjectText_()
	WScript.Echo objTargetInstance.CreationClassName
	If objTargetInstance.CreationClassName = "Win32_Process" Then
		Rtn = objTargetInstance.GetOwner(strNameOfUser, strDomain)
		If Rtn <> 0 Then
			Wscript.Echo "Could not get owner info for process " & objTargetInstance.Name & VBNewLine & "Error = " & Rtn
		Else 
			Wscript.Echo "Process launched by " & strDomain & "\" & strNameOfUser & "."
		End If
	End If
End Sub

private void ListDatabases_Click(object sender, System.EventArgs e)
{
using(SqlConnection cn=new SqlConnection("Server=localhost;Initial Catalog=master;Integrated Security=SSPI;"))
{
	cn.Open();
	SqlCommand cmd=new SqlCommand("sp_databases",cn);
	cmd.CommandType=CommandType.StoredProcedure;
	SqlDataReader dr=cmd.ExecuteReader();
	while(dr.Read())
	{
		Debug.WriteLine(dr.GetString(0));

	}
	dr.Close();
	cmd.Dispose();	

}

}

protected override void OnPaint(PaintEventArgs pea) {
MyDrawLine(pea.Graphics, 89, 76);
MyDrawLine(pea.Graphics, 32, 45);
}

private void MyDrawLine(Graphics g, int x, int y) {
g.DrawLine(somePen, 20, 20, x, y);
}

MyClass{
    // by default the fixed (x,y) coordinates are set to (0,0)
    private int _x = 0;
    private int _y = 0;

    // by default no line will be drawn
    private bool drawLineA = false;  
    private bool drawLineB = false;

   // should be called on each instance of the class to
   // set values for the fixed x and y parameters for the
   // draw line functions
   public void setInitialXY(int x,int  y)
   {
      _x = x;
      _y = y;
   }

   // helper function to demonstrate the concept
   private void  MyDrawLine(Graphics pg, int x,int y)
   {
        pg.DrawLine(_x,_y, x, y);
   }

   // the paint function examines the settings for each line
   // and draws the line if necessary. the values for x and y\
   // for each line have been picked arbitrary
   protected override void  OnPaint(PaintEventArgs pe)
   {
        if(drawLineA)
              MyDrawLine(pe.Graphics, 87, 67);
        if(drawLineB)
              MyDrawLine(pe.Graphics, 55, 94);
   }

    // the following two functions can be called on an instance of this class
    // to toggle the drawing of either of the functions
    //  a call to ToggleLineA/B can be made inside a button click event handler
   public void ToggleLineA()
   {
       drawLineA = !drawLineA;  // this toggles whether or not Line A is drawn
       this.Invalidate();       // after the change, make sure the object will be redrawn
   }

   public void ToggleLineB()   
   {
       drawLineB = !drawLineB;  // this toggles whether or not Line B is drawn
       this.Invalidate();       // after the change, make sure the object will be redrawn
   }
}