title: How to differentiate two instances of same form control in .net
body: <p>I have 2 Treeview in one form  as below.</p>
  
  <pre><code>left_treeview_node1  | right_treeview_node1 
  left_treeview_node2  | right_treeview_node2 
  left_treeview_node3  | right_treeview_node3
  left_treeview_node4  | right_treeview_node4
  </code></pre>
  
  <p>here we can drag and drop left treenode on right for mapping.</p>
  
  <p>now user has opened 2 instances of same form and he is dragging <code>left_treeview_node1</code> from first instance and dropping it to <code>right_treeview_node4</code> of another instance of same form.</p>
  
  <p>so how to differentiate the another instance and stop supporting drag and drop from one instance to another instance.</p>
  
  <p>are there different GUID for each instance of same form?</p>
  
  <p>can we use Mutex to differentiate between 2 instances of same form?</p>
  
  <p>Thanks in advance...</p>