c# - how to update other columns after select from DataGridComboBoxColumn when the row is still editing? -

i searching solution quite time without luck , hope can expert here.

for example, have product class:

public class productmodel : observableobject {     private int id;     public int id     {         { return id; }         set { id = value; onpropertychanged("id"); }     }      private string name;     public string name     {         { return name; }         set { name = value; onpropertychanged("name"); }     }      private decimal unitprice;     public decimal unitprice     {         { return unitprice; }         set { unitprice = value; onpropertychanged("unitprice"); }     } } 

and have class called order:

public class order : observableobject {     sportsentities db;      private int id;     public int id     {         { return id; }         set { id = value; onpropertychanged("id"); }     }      private int productid;     public int productid     {         { return productid; }         set         {             productid = value;             unitprice = db.products.first(x => x.id == value).unitprice;             onpropertychanged("productid");             onpropertychanged("unitprice");         }     }      private decimal unitprice;     public decimal unitprice     {         { return unitprice; }         set { unitprice = value; onpropertychanged("unitprice"); }     }      public order()     {         db = new sportsentities();     } } 

in view, have bound observablecollection viewmodel datagrid 2 columns - "product" , "unit price". 'product' column datagridcomboboxcolumn itemssource binding observablecollection.

i can select product , unit price once finish row editing. however, want unit price column updated after select product while still updating row.

can please advise? thank you.

added:

view

        <datagrid itemssource="{binding orders}" autogeneratecolumns="false">             <datagrid.columns>                 <datagridcomboboxcolumn width="120" header="product" selectedvaluebinding="                  {binding productid}"                                         displaymemberpath="name" selectedvaluepath="id">                     <datagridcomboboxcolumn.elementstyle>                         <style targettype="combobox">                             <setter property="itemssource" value="{binding datacontext.products, relativesource={relativesource mode=findancestor, ancestortype={x:type window}}}" />                         </style>                     </datagridcomboboxcolumn.elementstyle>                     <datagridcomboboxcolumn.editingelementstyle>                         <style targettype="combobox">                             <setter property="itemssource" value="{binding datacontext.products, relativesource={relativesource mode=findancestor, ancestortype={x:type window}}}" />                         </style>                     </datagridcomboboxcolumn.editingelementstyle>                 </datagridcomboboxcolumn>                 <datagridtextcolumn width="80" header="unit price" binding="{binding unitprice}" />             </datagrid.columns>         </datagrid> 

viewmodel

public class mainviewmodel : viewmodelbase {     private sportsentities db;      private observablecollection<productmodel> products;     public observablecollection<productmodel> products     {         { return products; }         set { products = value; onpropertychanged("products"); }     }      private observablecollection<order> orders;     public observablecollection<order> orders     {         { return orders; }         set { orders = value; onpropertychanged("orders"); }     }      public mainviewmodel()     {         initialized();     }      private void initialized()     {         db = new sportsentities();         products = new observablecollection<productmodel>();          foreach (product p in db.products)         {             products.add(new productmodel { id = p.id, name = p.name, unitprice = p.unitprice });         }          orders = new observablecollection<order>();     } }