c# - Default constructor being called during POST and I lose all model data -

c# - Default constructor being called during POST and I lose all model data -

i having problem form posting , model beingness lost. page posted .net calling default constructor of object though object exists.

i have 2 actions, 1 , 1 post

[httpget] public actionresult quote(string sku, string network, string grade ) { quotemodel qm = new quotemodel(); // build model here homecoming view("quote", qm); } [httppost] public actionresult quote(quotemodel qm, string grade, string network) { // update model homecoming view("quote",qm); }

the function works form posted, default constructor called , lose model data.

my view like:

@model pricecompare.models.quotemodel <div class="clarify"> @if (model.clarify == true) { using (html.beginform("quote", "home", formmethod.post)) { @html.dropdownlist("network", model.availablenetworks); @html.dropdownlist("grade", model.grades); <button type="submit">get quote</button> } } </div>

why default contructor beingness called when there existing model pass back?

i have tried specifying model in form like:

using (html.beginform("quote", "home", new { @qm = model}, formmethod.post)

if default constructor not beingness called qm null.

i've been going round in circles here trying figure out. can explain doing wrong?

c# razor asp.net-mvc-5