How to call javascript function in HTML helper that is @html.dropdownlistfor?

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MVC5

hi all,

As i am new in this technology. i'm facing some obstacles.

i have code but that is not working :
@Html.DropDownListFor(m => m.CountryId, Model.CountryId,null, new { @onchange = "ChangeCulture();" })


i'm getting error over here : Model.CountryId,null,


please help me with the explaination

What I have tried:

@Html.DropDownListFor(m => m.CountryId, Model.CountryId,null, new { @onchange = "ChangeCulture();" })

@Html.DropDownListFor(m => m.CountryId, Model.LanguageSelector, new { onchange = "ChangeCulture();" })

@Html.DropDownList(a => a.CountryId, "Select Your Country", new { @class = "form-control", onchange = "clickMe()" })

@Html.DropDownListFor(a => a.CountryId, Model.CountryName,null, new {@onchange="clickMe()"});