how to implement a check/uncheck in datagrid

Question

hi,

  i have a datagrid with 3 columns first column i need a checkbox in header row and for the binded columns as well if i check header chckbox all the binded checkboxs should select if i unselect it shuld get uncheck and also if i check all the binded rows header checkbox  shuld be activate and viceversa .how to acheive this.thanks