Configuration cfg = new Configuration();
cfg.AddAssembly("QuickStart");

NHibernate.MappingException was unhandled
  Message="Could not compile the mapping document: QuickStart.user.hbm.xml"
  Source="NHibernate"
  StackTrace:
       at NHibernate.Cfg.Configuration.LogAndThrow(Exception exception) in c:\DATA\Projects\nhibernate\2.0.x\copy1\nhibernate\src\NHibernate\Cfg\Configuration.cs:line 262
       at NHibernate.Cfg.Configuration.AddValidatedDocument(NamedXmlDocument doc) in c:\DATA\Projects\nhibernate\2.0.x\copy1\nhibernate\src\NHibernate\Cfg\Configuration.cs:line 436
       at NHibernate.Cfg.Configuration.ProcessMappingsQueue() in c:\DATA\Projects\nhibernate\2.0.x\copy1\nhibernate\src\NHibernate\Cfg\Configuration.cs:line 1557
       at NHibernate.Cfg.Configuration.AddDocumentThroughQueue(NamedXmlDocument document) in c:\DATA\Projects\nhibernate\2.0.x\copy1\nhibernate\src\NHibernate\Cfg\Configuration.cs:line 1548
       at NHibernate.Cfg.Configuration.AddXmlReader(XmlReader hbmReader, String name) in c:\DATA\Projects\nhibernate\2.0.x\copy1\nhibernate\src\NHibernate\Cfg\Configuration.cs:line 1541
       at NHibernate.Cfg.Configuration.AddInputStream(Stream xmlInputStream, String name) in c:\DATA\Projects\nhibernate\2.0.x\copy1\nhibernate\src\NHibernate\Cfg\Configuration.cs:line 506
       at NHibernate.Cfg.Configuration.AddResource(String path, Assembly assembly) in c:\DATA\Projects\nhibernate\2.0.x\copy1\nhibernate\src\NHibernate\Cfg\Configuration.cs:line 544
       at NHibernate.Cfg.Configuration.AddAssembly(Assembly assembly) in c:\DATA\Projects\nhibernate\2.0.x\copy1\nhibernate\src\NHibernate\Cfg\Configuration.cs:line 615
       at NHibernate.Cfg.Configuration.AddAssembly(String assemblyName) in c:\DATA\Projects\nhibernate\2.0.x\copy1\nhibernate\src\NHibernate\Cfg\Configuration.cs:line 601
       at QuickStart.Form1.button1_Click(Object sender, EventArgs e) in C:\data\pkoster\Projekte\Visual C#\IssueTracker\QuickStart\QuickStart\Form1.cs:line 29
       at System.Windows.Forms.Control.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
       at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ButtonBase.WndProc(Message& m)
       at System.Windows.Forms.Button.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.Run(Form mainForm)
       at QuickStart.Program.Main() in C:\data\pkoster\Projekte\Visual C#\IssueTracker\QuickStart\QuickStart\Program.cs:line 17
       at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: System.Collections.Generic.KeyNotFoundException
       Message="The given key was not present in the dictionary."
       Source="mscorlib"
       StackTrace:
            at System.ThrowHelper.ThrowKeyNotFoundException()
            at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
            at NHibernate.Dialect.Dialect.GetDialect(IDictionary`2 props) in c:\DATA\Projects\nhibernate\2.0.x\copy1\nhibernate\src\NHibernate\Dialect\Dialect.cs:line 173
            at NHibernate.Cfg.Configuration.AddValidatedDocument(NamedXmlDocument doc) in c:\DATA\Projects\nhibernate\2.0.x\copy1\nhibernate\src\NHibernate\Cfg\Configuration.cs:line 428
       InnerException:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section
      name="nhibernate"
      type="System.Configuration.NameValueSectionHandler, System, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
    />
  </configSections>

  <nhibernate>
    <add
      key="hibernate.connection.provider"
      value="NHibernate.Connection.DriverConnectionProvider"
    />
    <add
      key="hibernate.dialect"
      value="NHibernate.Dialect.MsSql2000Dialect"
    />
    <add
      key="hibernate.connection.driver_class"
      value="NHibernate.Driver.SqlClientDriver"
    />
    <add
      key="hibernate.connection.connection_string"
      value="Server=localhost;initial catalog=nhibernate;Integrated Security=SSPI"
    />
  </nhibernate>
</configuration>

user.hbm.xml
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
  <class name="QuickStart.user, QuickStart" table="Device">
    <id name="Id" column="LogonId" type="Int32" length="20" >
      <generator class="assigned">
      </generator>

    </id>
      <property name="UserName" column="Name" type="String" length="40"></property>
      <property name="Password" type="String" length="20"></property>
      <property name="EmailAddress" type="String" length="40"></property>
      <property name="LastLogon" type="DateTime"></property>
   
  </class>
</hibernate-mapping>