How to prevent default selection (first item is selected by default after form posting) in listbox in ASP.NET MVC?

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jQuery

bootstrap

MVC5

ASP.NET5

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@Html.ListBoxFor(x => x.SelectedUsers, new MultiSelectList(Model.Users, "value", "text"), new { multiple = "multiple", @tabindex = "15", @class = "multiselect" })

if i have 4 users selected and these these four items no one is first item means first items of users list is unselected before form posting but when form is posted then the first item of usersDropdown list will be selected along with all old selected users . so i want to prevent default or autometcally selection of first item of listbox aftr form posting .
please help me.

What I have tried:

Nothing.