C # interaction with uncontrolled statements

Using System;
Using System. Runtime. InteropServices;
Namespace FastCSharp
{
Class Class1
{

[STAThread]
Unsafe static void Main (string [] args)
{
// ComInvoke ();
// HelloWorld ();
// StructInvoke ();
// ClassInvode ();
// PointerInvoke ();
UnsafeMethod ();
}
// Call a com component
// Tlbimp tool
Public static void comInvoke ()
{
// String fileName = "c: windowsclock. avi ";
String fileName = @ "C: Documents and settingsadministratorwebwebapplication1中 dgdgdgmz.wma ";
QuartzTypeLib. FilgraphManager graphManager = new QuartzTypeLib. FilgraphManagerClass ();
QuartzTypeLib. IMediaControl mc = (QuartzTypeLib. IMediaControl) graphManager;
Mc. RenderFile (fileName );
Mc. Run ();
Console. WriteLine ("Hello World ");
Console. ReadLine ();
}
Public static void helloWorld ()
{
Win32Invoke. MessageBox (0, "Hello World", "Platform Invoke Sample", 0 );
}
// Transfer the structure variable
Public static void StructInvoke ()
{
Point p = new Point ();
P. x = 1;
P. y = 1;
Rect r = new Rect ();
R. left = 0;
R. bottom = 2;
R. right = 2;
R. top = 0;
Bool B = Win32Invoke. PtInRect (ref r, p );
System. Console. WriteLine ("Point [] is int Rect [,]? "+ B );
}
// Pass an object
Public static void classInvode ()
{
MySystemTime t = new MySystemTime ();