winforms - c# lock a windows forms control -

i'm programming winforms app, , have encountered problem:

i have, example, numeric updown control, , when pressing up/down button, don't want change, want access new value, without changing number on control itself.

i need able unlock under condition, that:

 private void numericupdown1_valuechanged(object sender, eventargs e)     {         if (!canchange)         {             int newvalue = get_expected_new_value();             dosomestuff(newvalue);             //some_code_to_cancel_the_value_change;         }         else         {             //allow change             dosomeotherstuff();         }     } 

how can thins thing?

you can use tag property of numericupdown1 store last value. although it's not particulary elegant solution.

credit to: c# numericupdown.onvaluechanged, how changed?

in case can this:

        private void numericupdown1_valuechanged(object sender, eventargs e)         {             var o = (numericupdown) sender;             int thisvalue = (int) o.value;             int lastvalue = (o.tag == null) ? 0 : (int)o.tag;             o.tag = thisvalue;              if (checkbox1.checked) //some custom logic             {                 //remove event handler it's not fired when change value in code.                 o.valuechanged -= numericupdown1_valuechanged;                 o.value = lastvalue;                 o.tag = lastvalue;                 //now add                 o.valuechanged += numericupdown1_valuechanged;             }             //otherwise allow normal         } 

basicaly store last known value in tag property. check condition , set value last value.