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You can receive the chosen value from a field and use this value in a variable in the controller?
This is my field:
<div class="form-group  hidden" id="idnome" > 
    <label>NOME </label>
    <div class="qlyAutoComplete">
        @Html.TextBox("NOME", null, new { @class = "form-control AutoCompletar", 
        maxlength = 50, urlAC = "/RecursosHumanos/PopularPessoa", hidAc = "" })
        @Html.ValidationMessage("NOME", new { @class = "CorVermelhoNegativo" })
    </div>
</div>