Unhandled Error in Silverlight Application, code 2103 when changing the namespace

Link：Unhandled Error in Silverlight Application,code 2103 when changing the namespace

I have a simple silverlight 3 solution with one xaml file. The solution is called creditclient and has the same namespace in App:

namespace CreditClient {

publicpartialclassApp :Application

and in xaml:

<Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns : x ="http://schemas.microsoft.com/winfx/2006/xaml"

x:Class="CreditClient.App">

 I need to change this namespace,for example to:

in App.xaml.cs

namespace MyCompany.Applications.CreditClient {

publicpartialclassApp :Application

and in App.xaml

<Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

x:Class="MyCompany.Applications.CreditClient.App">

 as soon as I do this,the application will not run-->

onSilverlightError throws the following error:

Unhandled Error in Silverlight Application

Code: 2103

Category: InitializeError

Message: Invalid or malformed application: Check manifest

 I cleand and rebuild the solution several times,but it dosen't help. Why shouldn't I be able to change the namespace?

I found the solution,application startup object in project properties was still set to the old namespace!