Wash asparagus and snap off ends.
Place asparagus in steamer and steam for 5 minutes. Set aside.
For Sauce, melt butter in saucepan over medium high heat.
Slowly add in flour and mix until there are no lumps.
Add milk to flour mixture and whisk until combined.
Cook over medium heat until thick, stirring constantly.
Add in wine and dry mustard and continue stirring.
Add cheese and remove from heat.
Place asparagus in serving dish and top with cream sauce.