mvvm how to pass data from one view model to another view model - silverlight

Question

I have One View which has one Data grid with radio Button , onchecking radio Box , the selected row should go to other View Screen Textbox
here is my first ViewModel
public class CampaignSearchResultsViewModel : ViewModelBase
{
public CampaignSearchResultsViewModel(List<Lead> obj)
{
foreach(Lead lead in obj)
{
SelectedLead = lead;
}
}
public CampaignSearchResultsViewModel()
{
this.Commands.Add("CheckedCommand", new ActionCommand<Lead>(CheckIt));
Commands.Add("OutboundSelect", new ActionCommand<Object>(OutboundSelection));
_leads = new ObservableCollection<Lead>();
}
public ICommand OutboundSelect
{
get
{
return Commands["OutboundSelect"];
}
}
public void OutboundSelection(Object obj)
{
}
private void CheckIt(Lead lead)
{
SelectedLead = lead;
LeadViewModel lmv = new LeadViewModel(this);
}
#region Private
private ObservableCollection<Lead> _leads;
public bool IsChecked { get; set; }
private ICommand _checkedCommand;
private object _testProperty;
private Lead _selectedLead;
private ICollectionView icv;
#endregion
private ICommand _checkedRadioCommand;
private bool _inboundChecked;
#region Properties
public ObservableCollection<Lead> Leads
{
get { return _leads; }
set
{
_leads = value;
FirePropertyChanged("Leads");
}
}
public Lead SelectedLead
{
get { return _selectedLead; }
set { _selectedLead = value; }
}
public ICommand CheckedCommand
{
get
{
return Commands["CheckedCommand"];
}
}
public bool InboundChecked
{
get
{
return _inboundChecked;
}
private set
{
if (_inboundChecked != value)
{
_inboundChecked = value;
FirePropertyChanged("InboundChecked");
}
}
}
#endregion
}
i have to map SelectedLead to the other view model i have pass info to SearchCampaignMembers() method , how
public partial class LeadViewModel : ViewModelBase
{
public void SearchCampaignMembers()
{
_service.Load(_service.SearchCampaignMembersQuery(Entity.FirstName, Entity.LastName), lo =>
{
if (!lo.HasError)
{
ListLead = lo.Entities.ToList();
_savedLeadStatusId = Entity.LeadStatusId;
EntitySet = _service.Leads;
if (ListLead.Count == 1)
{
if (Entity != null)
{
IsVendorLead = Entity.LeadTypeId == Lookups.LeadType.VendorLead;
//Lead Update History
EntityQuery<LeadUpdateHistory> historyquery = null;
historyquery = _service.GetLeadUpdateHistoryByLeadIdQuery(Entity.LeadId);
_service.Load(historyquery, l =>
{
if (!l.HasError)
{
EntityHistory = _service.LeadUpdateHistories;
}
}, null);
//Lead Assignment
EntityQuery<LeadsAssignment> assignmentquery = null;
assignmentquery = _service.GetLeadsAssignmentByLeadIdQuery(Entity.LeadId);
_service.Load(assignmentquery, l =>
{
if (!l.HasError)
{
EntityAssignment = _service.LeadsAssignments;
}
}, null);
if (Entity.LeadTypeId == Lookups.LeadType.PhoneLead)
{
IsInboundLead = Entity.VendorId == null;
IsOutboundLead = Entity.VendorId != null;
}
else
{
IsInboundLead = false;
IsOutboundLead = false;
}
//SelectTimeToCall(Entity);
if (IsOutboundLead)
SelectedCampaign = Entity.LeadCampaigns.FirstOrDefault().Campaign;
else
SelectCampaign(Entity);
OperationsListener listener = new OperationsListener();
listener.Completed += (s, args) =>
{
CompleteInitializing();
//SwitchTab(param.InitialTab);
Action action = () =>
{
SelectDealer(Entity);
};
//GetDealerRecommendation(Entity.Address.ZipCode, action);
SelectStatus(Entity);
//if (callback != null)
// callback();
};
LoadLookupData(listener);
listener.Start();
}
}
else if (ListLead.Count >= 1)
{
CampaignSearchResultsViewModel vm = new CampaignSearchResultsViewModel();
foreach (Lead lead in ListLead)
{
vm.Leads.Add(lead);
ObservableCollection<Lead> abc;
abc = new ObservableCollection<Server.DataAccess.Lead>();
}
ViewController.OpenDialog("SearchCampaignResults", vm, r =>
{
});
}
else if (ListLead.Count == 0)
{
ViewController.OpenDialog("NoResults", (r) =>
{
});
}
}
else
{
//if (callback != null)
// callback();
}
}, null);
}
}

Answer 1

If you use MVVM Light Toolkit, see Messenger class see this answer for sample.