Question

I use this code for select two field

     public ViewModelList(CRMEntities crm)
    {
       var cus = (from c in crm.Customer
                  select new 
                  { c.Name, c.Family });
        AllCustomer = new ObservableCollection<Custom>(cus.ToList());
     }
     public ObservableCollection<Custom> AllCustomer
    {
        get;
        set;
    }


    }

    public class Custom
   {
     public  string Name{get;set;}
    public string Family { get; set; }

   }

, but gives the following error

cannot convert from ‘System.Collections.Generic.List’ to ‘System.Collections.Generic.List’

Answer 1

In your ObservableCollection you are specifying that the element is of type Custom.
When you perform the select you are creating an anonymous type. Using new { … } will create an anonymous type.

What you probably want to do is

select new Custom { Name = c.Name, Family = c.Family };