Hii,
you can add id attribute to both text boxes, then you can get their values in javascript or jQuery.
like,
@Html.TextBoxFor(model => model.value1, new { @class = "form-control control-text", @id= "txtBox1" })
and
@Html.TextBoxFor(model => model.value2, new { @class = "form-control control-text", @id= "txtBox2" })
Now in jQuery,
alert($('#txtBox1').val() + $('#txtBox2').val());