Commented Unassigned: CheckComboBox mvvm problem [20774]

hi

this is my sample

when checked multiple item in CheckComboBox

but only one checked item CheckComboBox save to database

how to save All checked items CheckComboBox to database?

thanks
Comments: ** Comment from web user: md110 **

hi
Thank you for your attention
All Right , Thse 3 Properties shouldn't be used together
Unused the SelectedMemberPath And SelectedItem in this sample
i forget Remove this tags from Xaml code

i am using SelectedValue And binding To Documentdata.PersonID and save PersonID value to Document Table
but only one item checked save.

i am understand use SelectedItemsOverride="{Binding SelectedItemPersons}" but i Do not know
how to use SelectedItemPersons in view model and save values to database

when

private void DoAddNew()
{
Documentdata = Documentdata ?? new Document();
Documentdata.Person = SelectedItemPersons ;
RaisePropertyChanged("Persondata");
RaisePropertyChanged("Documentdata");
}

in line 2 exeption error:

cannot convert type observablecollection to target type ............................

please edit my sample and help me to resolve this problem And submit

thank you