How to check custom control's property value at design time

Question

Hi,

i notice that every web server controls have a property runat='server', when i chenge the value of this property at design time, a warming will be shown like this:

this is a very good feature.

now i want use this feature into my custom control developed by my self.

my control  like this:

i just want my control check the property Old not large than 130 and not less than 0 at design time , what can i do?

thank you very much.

Answer 1

The web form forum is on forums.asp.net. The designer is not an IE feature but a feature of Visual Web Developer.

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