Passing Variables into User Control

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I have a custom user control, and in it is a gridview. I need to perform a database query and bind data to that gridview based on what is on the page I loaded the control onto. I'm dynamically creating the controls, so I'm wondering if I can overload the constructor or something? Or do I have to call a postback or something? The user controls are being instantiated in an overloaded OnInit() method on the page. Thanks!

Posted 24-Mar-13 16:43pm

Jack R. Schaible

Updated 24-Mar-13 16:44pm

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Sergey Alexandrovich Kryukov · Accepted Answer · 2013-03-24T17:09:00

If you pass some data to an instance of some class and use it somewhere beyond just this passing method, it cannot be a "variable"; it has to be a class member, a field, a property, or both (property backed by a field).

Yes, you can add a constructor with appropriate parameters, but this will allow you to modify some value of some (instance) member(s) only once. And this is not the intended approach for the design of use control classes.

The "standard" design is using parameterless constructors only. To solve your problem, you need to add an internal or (more usually) public read-write property. Note that using an internal or public field is considered a bad style, by some good reasons.

—SA