private SterlingLib.STIOrderMaint stOrdMaint=new SterlingLib.STIOrderMaint();
private CancelSterlingOrder(string ClOrderId){
this.stOrdMaint.CancelOrder("MY_ACCOUNT", 0, ClOrderId, ClOrderId+"_Canceled");
}
Note: The "ClOrderId" is the ClOrderId of the order you want to cancel...