Question: I have a Checkbox and a Dropdownlist (with a 'All' as first element) like so :

```
<td style="width: 15px">
   <asp:CheckBox ID="isAdvertiserFilter" runat="server" AutoPostBack="false"/>
</td>
<td style="width: 330px">
    <asp:DropDownList ID="AdvertiserFilterList" runat="server" DataTextField="Name" DataValueField="Id" AutoPostBack="true" Enabled="false"/>
</td>

```

The checkbox enable/disable the dropdownlist.

When enabled, the user can select any item in the list (All, Item1, Item2...) The event is handled in the code behind :

```
this.AdvertiserFilterList.SelectedIndexChanged += new EventHandler(SearchFilter);

```

So, when the user Uncheck the checkbox I want the dropdownlist to be set to 'All' and be disabled. In my javascript when I set to "All" (value -1, index 0) It doesn't trigger the event of the code behind to call my SearchFilter function.

```
$(document).on({
click: function (event) {
    if ($(event.target).is('#isAdvertiserFilter'))
    {
        // Enable or disable the dropdowlist
        $('select[id*="AdvertiserFilterList"]').attr("disabled", !$('input[id*="isAdvertiserFilter"]').prop("checked"));
        // When UNcheck
        if (!$('input[id*="isAdvertiserFilter"]').prop("checked")) {
            // Set to the dropdownlist to All
            $('select[id*="AdvertiserFilterList"]').val("-1");
            // Trying to fire the event
            $('select[id*="AdvertiserFilterList"]').trigger("change");

        }
    }
},
});

```

How to call my codebehind or trigger the event as if the user did it ? 

I want to PostBack only when the checkbox is UNcheck (and not check) or when the dropdowlist 'SelectIndexChanged'

Answer: 
```
object GameDao {
    fun hereGoesYourFunctions()
}

```

calling hereGoesYourFunctions will initialize the GameDao class.
You may try even better approach :

```
class SingletonClass private constructor() {

init {
    println("This ($this) is a singleton")
}

private object Holder {
    val INSTANCE = SingletonClass()
}

companion object {
    val instance: SingletonClass by lazy {
        Holder.INSTANCE
    }
}

```