How to clear treeview node in c#

Question

In my project Am I using multiple treeview. Here I used tab control for load the data in treeview . I want to move all the tabs in tabcontrol. based on this treeview also changed. Here I want to clear the tree view node . Because It was showing one data into multiple times .I want only one data in treenode nodes. How can I do this????????????please help me.

 

 

Thanks .