you have to do it manually like this : if(textbox1.text == "") { MessageBox.show("SomeThing...."); return; } and there is some controls in Devexp ... الإطلاع على المزيد
There are two levels of validation one might want to implement. 1) Field level Validation should control what characters are valid as input to the field, and what would ... الإطلاع على المزيد
Well if you are considering minimizing the hassle you can always use the MaskedTextBox control, you can add your own validation rules to it, so that it fits your need, if ... الإطلاع على المزيد