Update value from a model with one from another model

Question

Hello, I have a project for school to make an auction website.

 

I managed to make the controller to Add Bids for Auction, but now I don't know how to update the "Start Price" from Auction with value from bidders:

 

 

 

 

I don't know exactly but it can be done in the view only? 

 I tried to do that, but without success.

 

<dd>
          @Html.DisplayFor(model => model.DataIncheiere)
      </dd>

      <dt>
          @Html.DisplayNameFor(model => model.PretInitial)
      </dt>

      <dd>
          @Html.DisplayFor(model => model.PretInitial== model.PretInitial + model.Oferte.LastOrDefault(b =>(b.ValoareBid).ToString()))
      </dd>

      <dt>
          @Html.DisplayNameFor(model => model.Produse.NumeProdus)
      </dt>