Firing OnCheckedChanged event with ASP:RadioButton

Question

I have the following RadioButtons: ``` ``` And in the code behind I have this: ``` Protected Sub Check_Clicked(ByVal sender As Object, ByVal e As EventArgs) Handles rdoStandard.CheckedChanged, rdoExpress.CheckedChanged, rdoNextDay.CheckedChanged RaiseEvent DeliveryOptionChanged() End Sub ``` I have tried the above but also tried different ways, such as a click method for each of the `RadioButtons` and I never hit the `Check_Clicked` method. I do not want to `AutoPostBack`, and cannot see why you would want to if you were firing an event? Its been a while since I used `VB` and WebForms, Can someone help me with this?

Accepted Answer

You need to set `AutoPostBack` to true if you want to trigger the event immediately, default is `false`.

```
<asp:RadioButton id="rdoStandard" AutoPostback="true" runat="server" Checked="true" GroupName="delivery" OnCheckedChanged="Check_Clicked" />
```

Note that a `RadioButton` inherits from `CheckBox`, therefor it inherits the `AutoPostback` property therefrom

Edit: If you want to avoid a postback, this event is also raised on the next roundtrip to the server when you don't set `AutoPostback` to true. You could for example use a submit-button, both, the Button's and also the CheckBox' click events are raised successive.

Firing OnCheckedChanged event with ASP:RadioButton

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