c# - Windows Form. Limit User input to a certain range -

i creating windows form program class , trying limit input 'weight' textbox 1-1000. got user input parse double reason error message created not popup @ right time intended. (the error message popup if enter digits passed 5 digits... can enter 2222 or 10000 without error)

private void weight_keypress(object sender, keypresseventargs e) { var sourcevalue = weight.text; double doublevalue; if (double.tryparse(sourcevalue, out doublevalue)) {     if (doublevalue > 1000 )     {         messagebox.show("cannot greater 1000");     } } } 

instead of using keypress should use textchanged event because if use keypress new char not part of control text yet.

private void inputtextbox_textchanged(object sender, eventargs e)         {             var inputtextbox = sender textbox;             var sourcevalue = inputtextbox.text;             double doublevalue;             if (double.tryparse(sourcevalue, out doublevalue))             {                 if (doublevalue > 1000)                 {                     messagebox.show("cannot greater 1000");                 }             }         }