How to Invoke Function from Form through Controls event?

[manju 3]

Hi Team, How can i call function from Forms through any of the controls? Suppose i have function Validate() in FrmTest.cs under Global\Forms\ FrmTest.cs private void Validate() { } And control TestControl.cs under Global\Control\ TestControl.cs For any drop down event changed,i need to invoke the function Validate() from FrmTest.cs. Any suggestions will be great helpful Thanks in advance Manju

[Lost User]

You need a reference to the class that contains the Validate method. But without some more details of your application it is difficult to be more specific.

[Dave Kreskowiak]

You're doing this backwards. The control shouldn't know anything about the form it's on. It might not even be in the Controls collection of a Form. It may be a few levels deep in other control containers. The control should validate it's own content, not the form.

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Dave Kreskowiak

[Lost User]

Add a (public) "delegate" or Func instance to your target control that is automatically called by the event in question; the "default" response / behaviour of the delegate can be whatever you want (like a NotImplementedException). Otherwise, you pass in a reference to "Validate()" and initialize the delegate with that reference when the target control(s) are created. That's a generic way for attaching extra / new behavior to an object. Depending on the development context (Windows Forms; WPF; MVVM; blah, blah), you would probably adopt some other technique (like "command binding"!).