C#

try
{
    Monitor.Enter();
    // Critical section
}
finally
{
    Monitor.Exit();
}

As you may have guessed, Monitor actually uses Windows events underneath it all.  Each CLR thread has a manual-reset event, allocated when it is created (or lazily when the thread first wanders into managed code).  When a Wait is issued, this per-thread event is stuck on the tail of a linked list associated with the target object’s sync block.  We can use a single event per thread since a thread can only ever be waiting for a single object at a given time.  (You can’t do a WAIT_ANY or WAIT_ALL on monitors.)  The thread then releases the lock on the object (accounting for any recursion), waits on this event, and then reacquires the lock on the object (again, accounting for any recursion).  When a Pulse is issued, the head of the object’s linked list of waiters is popped off and its associated event is signaled.  Similarly, PulseAll clears the entire linked list and signals all of the events.  Notice I said that Pulse operates on the head of the list: we use a strict FIFO ordering (as of 2.0)....

//your non critical code
System.Threading.Monitor.Enter(this);
 //do something critical
System.Threading.Monitor.Exit(this);
//remaining code

static int status = 0;

if (status == 0) {
   int prevStatus = status.SetNewAndGetPrevious(1);

   if (prevStatus == 0) {
      // we got it, do something
      status = 0;
   } else {
      // someone beat us to it
   }
}

if (listView1.SelectedItems.Count > 0)
            {
                int SelectedItemCount = listView1.SelectedItems.Count;
                int usableSelectedItemCount = SelectedItemCount - 1;
                if (MessageBox.Show("Are you sure you want to delete these "
                    + SelectedItemCount + " items?",
                    "Confirm Delete", MessageBoxButtons.YesNo,
                    MessageBoxIcon.Warning,
                    MessageBoxDefaultButton.Button2, 0) == DialogResult.Yes)
                {                    
                    foreach (ListViewItem item in listView1.SelectedItems)
                    {
                        listView1.Items.Remove(item);
                    }
                }
                else if (listView1.SelectedItems.Count == 1)
                {
                    if (MessageBox.Show("Are you sure you want to delete?",
                        "Confirm Delete", MessageBoxButtons.YesNo,
                        MessageBoxIcon.Warning,
                        MessageBoxDefaultButton.Button2, 0) == DialogResult.Yes)
                    {
                        // Apply as above
                        //listView1.Items.Remove(listView1.SelectedItems[0]);
                    }
                }
            }

Syed Muhammad Kamran wrote:

How can I get a reference of the calling Assembly at Runtime?

Regards

Assembly asm = Assembly.GetAssembly ( Type ( MyRestrictedAssembly ) );
byte[] b = asm.GetName ().GetPublicKey ();
this.GetType ().Assembly.GetName ().SetPublicKey ( b );
TypeFromRestrictedAssembly temp = new TypeFromRestrictedAssembly ( this.GetType ().Assembly );