I don't know when and how it happened, maybe when I installed VS 2010 side-by-side with VS 2008, but my VS 2010 default language was set to Visual Basic and I don't use "that thing" anymore. I ignored it for a while since I have been just converting from VS 2008 but it got annoying because every time I created a new project it was created with Visual Basic so I had to delete it and recreate it.

Finally I decided to change the setting but I was looking on the wrong place Tools -> Options. After a while I found this eggheadcafe posting and as it said it is Tools -> Import and Export Settings.:

Save your current settings in case you change your mind later: (not me :-))

Then select Visual C# Development Settings and click Finish:

While installing Silverlight 4 Tools v1.0 for Visual Studio I ran into the following screen sometimes after the installation hanged for a while:

I had found that problem before while trying to install SQL Server 2008 so I located the following registry key:

and removed this from the PendingFileRenameOperations

After doing that I ran the installation again and it completed successfully.

Let the source code speak: (This is from a real application not "Demoware")

          
            using System; using System.Collections.Generic; using System.ComponentModel; using System.ComponentModel.DataAnnotations; using System.Linq; using System.ServiceModel.DomainServices.Hosting; using System.ServiceModel.DomainServices.Server; using CBSI.GL.Application; using CBSI.NHibernate.DomainServices; using CBSI.GL.Domain; using CBSI.GL.DA; using CBSI.TAE.Dashboard.RIAServices.Web.Properties; namespace CBSI.TAE.Dashboard.RIAServices.Web.Services
{ [EnableClientAccess()] public
class AccountCategoryDomainService : GLDomainService<AccountCategoryRepository, 
          
            AccountCategory, long>
{ IAccountCategoryService _AccountCategoryService; public AccountCategoryDomainService(IAccountCategoryService accountCategoryService)
: base(accountCategoryService.Repository) { _AccountCategoryService
= accountCategoryService; } public IEnumerable<AccountCategoryModel>
Categories() { return from c in
this.Repository.All where (c.GLSetup.ID==this.GLSetup.ID) orderby c.Name select
new AccountCategoryModel(c); } public
void Insert(AccountCategoryModel model)
{ if (this.Exists(model.Name)) throw
new ApplicationException(string.Format(Resources.AlreadyExistEntityWithName, Resources.Entity_Name_Category,
model.Name)); AccountCategory accountCategory
= new AccountCategory(this.GLSetup);
accountCategory = model.ToDomain(accountCategory); SaveTransaction(accountCategory); this.ChangeSet.Associate(model,
accountCategory, MapToModel); } public void Update(AccountCategoryModel model)
{ AccountCategory accountCategory = this.Repository.Get(c
=> c.ID == model.ID); if (accountCategory==null) throw
new ApplicationException(string.Format(Resources.UpdatingNonExistingEntity, Resources.Entity_Name_Category));
accountCategory = model.ToDomain(accountCategory); SaveTransaction(accountCategory); this.ChangeSet.Associate(model,
accountCategory, MapToModel); } public void Delete(AccountCategoryModel model)
{ AccountCategory accountCategory = this.Repository.Get(c
=> c.ID == model.ID); if (accountCategory == null) throw
new ApplicationException(string.Format(Resources.DeletingNonExistingEntity, Resources.Entity_Name_Category));
DeleteTransaction(accountCategory); } bool Exists(string name)
{ var ac = this.Repository.Get(
c => c.Name == name); return (ac != null);
} void MapToModel(AccountCategoryModel acm, AccountCategory ac
) { acm = new AccountCategoryModel(ac);
} } } 
        

When talking about the Model View ViewModel (MVVM) , Model View Controller (MVC) or any other presentation patterns Model some people refer to it as the Database Model, others as the Domain Model. Well, it is actually referred as a Presentation Data Model.

Your database or domain types could have many properties that the View does not care about and it will be a waste of resources as well as a security risk to have all that data traveling back and fourth the network even if it is an intranet.

Another problem with using Database or Domain data in your MVVM is that any change to the database or domain will require to update all the clients and that could be very costly.

Let's assume for example that we have the following very simple Domain Model:

and the following Database Model:

Note: I created the Database Model using the following NHibernate mapping:

                  <?
                  xml 
                  version
                  ="1.0" encoding="utf-8"?>
<!--Generated with CyberBizSoft's NHibernate
Helper on 12/16/2009 11:30:06 PM --> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="CyberBizSoft.SSL.Domain" 

                  namespace
                  ="CBSI.SSL.Domain">
<class name="Store" table="SSLStores" lazy="false" >
<id name="ID" unsaved-value="0" column="ID" type="System.Int64">
<generator class="identity" />
</id> <property name="Name"/>
<property name="Description"/>
<component name="Contact" class="CBSI.Common.Domain.SingleContact, 

                  CyberBizSoft.Domain" >
<component name="Address" class="CBSI.Common.Domain.Address,
CyberBizSoft.Domain"> <property name="Street" column="Street" />
<property name="City" column="City" />
<property name="State" column="State" />
<property name="ZipCodeNumber" column="ZipCodeNumber" />
<property name="Country" column="Country" />
</component>
<component name="Phone" class="CBSI.Common.Domain.Phone,
CyberBizSoft.Domain"> <property name="FullNumber" column="PhoneNumber"/>
</component>
<component name="Fax" class="CBSI.Common.Domain.Phone,
CyberBizSoft.Domain"> <property name="FullNumber" column="FaxNumber"/>
</component>
<component name="EMail" class="CBSI.Common.Domain.Url,
CyberBizSoft.Domain"> <property name="URL" column="EMailAddress"/>
</component>
<component name="Web" class="CBSI.Common.Domain.Url,
CyberBizSoft.Domain"> <property name="URL" column="WebAddress"/>
</component>
</component>
</class>
<!--Copyright (c) 2001 - 2009 by CyberBizSoft,
Inc. All rights reserved.--> </hibernate-mapping 

Let's say that we have to create an interface only to change the Name and Description of this Store. Why would we have to bring all the other information into the client if we only need the Store's ID, Name & maybe Description?

Preferably we could create a very simple presentation data model (StoreNameModel) which we could adorn with presentation specific attributes,

          class 
          StoreNameModel {
[Key] public long ID
{ get; set; } [Required] public
string Name { get; set;
} public string Description { get; set;
} }

map the data from the Domain Store in the service to the StoreNameModel

            public 
            IQueryable<StoreNameModel>
Stores() { return from c in Repository.All orderby (c.Name) select
new StoreNameModel() { ID = c.ID, Name
= c.Name, Description = c.Description }; }

If you create a Silverlight application using the WCF RIA Services Class library and with the following walkthrough when you try to access the Context for the RIA application (WebContext) it is not there.

Since we did not enabled the WCF RIA Services for the Silverlight application the WebContext class is not generated in the client.

You can verify this by selecting the Silverlight application in the Solution Explorer, click the Show All Files button in the Solution Explorer toolbar and then inspecting the hidden "Generated_Code" folder.

The workaround is to right click on the Silverlight application in the Solution Explorer, select Properties and  temporarily enable the WCF RIA Services by selecting the web project in the WCF RIA Service link.

Then rebuild the solution find and copy the WebContext class in the file [YourServerAssemblyName].g.cs in the afore mentioned folder to a new file WebContext.cs somewhere in the Silverlight application project.

Now right click on the Silverlight application in the Solution Explorer again and select <No Project Set> in the WCF RIA Service link and rebuild again. "Generated_Code" folder content will be removed.

This is kind of a hack and I believe it could be solved if the WCF RIA Services Class Library template will check if the WebContext exists in the Silverlight application and if not exist it will generate it.

Update (4/26/2010)

If you move the WebContext.cs file to the WCF RIA Services library client make sure to update your app.xaml with the following:

              <
              app
              :
              WebContext
              >
<
              app
              :
              WebContext.Authentication
              >
<
              appsvc
              :
              FormsAuthentication
            

              
              
              DomainContextType
              ="[TheNamespaceOfYourRIALibrary].AuthenticationContext,
            

              [TheNameOfYourRIAClassAssembly ], Version=
[X].0.0.0"/> 
              <!--<appsvc:WindowsAuthentication/>--> 
              </
              app
              :
              WebContext.Authentication
            

              
              
               </
              app
              :
              WebContext 
            

Digging through my old backups I found the following application that was one of the first I built using Visual Studio for a private investigation firm way back in 1997:

It has been a long love-hate relationship with Visual Studio. Happy Birthday Visual Studio!

I completed the upgrade to VS 2010 but with some warnings. Apparently nothing important.

[04/16/10,16:44:37] Microsoft Visual Studio 2010 Professional - ENU: [2] WARNING:Warning 1946.Property 'System.AppUserModel.ExcludeFromShowInNewInstall' for shortcut 'WinDiff.lnk' could not be set.

[04/16/10,16:44:37] Microsoft Visual Studio 2010 Professional - ENU: [2] WARNING:Warning 1946.Property 'System.AppUserModel.ExcludeFromShowInNewInstall' for shortcut 'OLE-COM Object Viewer.lnk' could not be set.

[04/16/10,16:44:38] Microsoft Visual Studio 2010 Professional - ENU: [2] WARNING:Warning 1946.Property 'System.AppUserModel.ExcludeFromShowInNewInstall' for shortcut 'Manifest Generation and Editing Tool.lnk' could not be set.

[04/16/10,16:44:38] Microsoft Visual Studio 2010 Professional - ENU: [2] WARNING:Warning 1946.Property 'System.AppUserModel.ExcludeFromShowInNewInstall' for shortcut 'Install Microsoft FXCop.lnk' could not be set.

***EndOfSession***

Here is my list: (I removed Visual Studio 2005 but not 2008)

UPDATE

Later today (4/17/2010) I noticed the following entries in the Application Event Log:

Error in Template (C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\ItemTemplates\Web\VisualBasic\1033\AdoNetEntityDataModelVB_ASPNET.zip), file (ModelObjectItemVB_ASPNET.vstemplate). Invalid template element (TemplateID) value (Microsoft.Data.Entity.Design.VSTemplate.ModelObjectItemVB_ASPNET).

Error in Template (C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\ItemTemplates\Web\CSharp\1033\AdoNetEntityDataModelCSharp_ASPNET.zip), file (ModelObjectItemCS_ASPNET.vstemplate). Invalid template element (TemplateID) value (Microsoft.Data.Entity.Design.VSTemplate.ModelObjectItemCS_ASPNET).

Error in Template (C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\ItemTemplates\Web\VisualBasic\1033\AdoNetDataServiceVBWebsite.zip), file (WebDataService.vstemplate).  Unknown attribute (_locID).

Error in Template (C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\ItemTemplates\Web\VisualBasic\1033\AdoNetDataServiceVBWebsite.zip), file (WebDataService.vstemplate).  Unknown attribute (_locID).

Error in Template (C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\ItemTemplates\Web\CSharp\1033\AdoNetDataServiceCSharpWebsite.zip), file (WebDataService.vstemplate).  Unknown attribute (_locID).

Error in Template (C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\ItemTemplates\Web\CSharp\1033\AdoNetDataServiceCSharpWebsite.zip), file (WebDataService.vstemplate).  Unknown attribute (_locID).

Error in Template (C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\ItemTemplates\VisualBasic\Web\1033\AdoNetDataServiceVBWap.zip), file (WebDataService.vstemplate).  Unknown attribute (_locID).

Error in Template (C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\ItemTemplates\VisualBasic\Web\1033\AdoNetDataServiceVBWap.zip), file (WebDataService.vstemplate).  Unknown attribute (_locID).

Error in Template (C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\ItemTemplates\CSharp\Web\1033\AdoNetDataServiceCSharpWap.zip), file (WebDataService.vstemplate).  Unknown attribute (_locID).

Error in Template (C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\ItemTemplates\CSharp\Web\1033\AdoNetDataServiceCSharpWap.zip), file (WebDataService.vstemplate).  Unknown attribute (_locID).

Although all these Item Templates where present, I ran "DevEnv.exe /installvstemplates" from an Administrator Visual Studio Command Prompt (2010) just in case.

For professional health providers who need to concentrate on providing the best solution to patient's health problems, the Medical Facility Manager is a health information management system that provides a single point of access to the practice information to providers, patients and vendors. The system will store all internal and external transactions within the facility by keeping record of every interaction between patients and providers including accounting. The system will save facilities 40 percent of clerical costs in the first year of use by allowing patients to self-register, schedule appointments and retrieving tests results online. Furthermore it will allow facilities to save on accounting costs since it implements claims, billing, payroll and general accounting tasks by using The Accounting Engine. Unlike the current antiquated systems with poor security record and insecure slow manual systems, Medical Facility Manager implements state of the art security and backup sub-systems and will comply with federal and state government security and reporting requirements.

One of the advantages of open source software is that it assist in troubleshooting and solving errors in your application.

Recently I ran into the following problem with ASP.NET MVC 2.0 RC.

After some searching I found the following post:

ASP.NET MVC 2 problem with UpdateModel

I downloaded the ASP.NET MVC 2 RC source code, extracted the zip file, located the offending method and commented out the problem:

            public sealed class 
            FormCollection : NameValueCollection, IValueProvider { public FormCollection()
{ } public FormCollection(NameValueCollection collection)
{ if (collection == null)
{ throw new ArgumentNullException("collection");
} Add(collection); } public ValueProviderResult GetValue(string name)
{

            
              Commented Code
            
            //if
(String.IsNullOrEmpty(name)) { // throw new ArgumentException(MvcResources.Common_NullOrEmpty,
"name"); //} 
            string[] rawValue =
GetValues(name); if (rawValue == null)
{ return null; } string attemptedValue
= this[name]; return new ValueProviderResult(rawValue,
attemptedValue, CultureInfo.CurrentCulture); } public IValueProvider ToValueProvider()
{ return this; } #region IValueProvider
Members bool IValueProvider.ContainsPrefix(string prefix)
{ return ValueProviderUtil.CollectionContainsPrefix(AllKeys,
prefix); } ValueProviderResult IValueProvider.GetValue(string key)
{ return GetValue(key); } #endregion
private sealed class FormCollectionBinderAttribute : CustomModelBinderAttribute { //
since the FormCollectionModelBinder.BindModel() method is thread-safe, we only need
to keep // a single instance of the binder around private
static readonly FormCollectionModelBinder _binder
= new FormCollectionModelBinder(); public
override IModelBinder GetBinder() { return _binder;
} // this class is used for generating a FormCollection
object private sealed class FormCollectionModelBinder : IModelBinder { public
object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
{ if (controllerContext == null)
{ throw new ArgumentNullException("controllerContext");
} return new FormCollection(controllerContext.HttpContext.Request.Form);
} } } } }

After the solution was built,  I copied the output to the Libraries folder of the application:

Removed the existing reference to System.Web.Mvc from the MVC Application and created a reference the the System.Web.Mvc in the Libraries folder.

Then I commented out the  System.Web.Mvc GAC-version reference from web.config:

          
            <
            compilation 
            debug
            ="true"
          
            >
<
            assemblies
          
          
            >
<
            add 
            assembly
            ="System.Core,
Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" 
          
            />
<
            add 
            assembly
            ="System.Web.Extensions,
Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" 
          
            />
<
            add 
            assembly
            ="System.Web.Abstractions,
Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" 
          
            />
<
            add 
            assembly
            ="System.Web.Routing,
Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" 
          
            />
<!--
            <add assembly="System.Web.Mvc, Version=2.0.0.0,
Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL"
/>
          
          
            --> <
            add 
            assembly
            ="System.Data.DataSetExtensions,
Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" 
          
            />
<
            add 
            assembly
            ="System.Xml.Linq,
Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" 
          
            />
<
            add 
            assembly
            ="System.Data.Linq,
Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" 
          
            />
<
            add 
            assembly
            ="Microsoft.ReportViewer.WebForms,
Version=9.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" 
          
            />
<
            add 
            assembly
            ="Microsoft.ReportViewer.Common,
Version=9.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" 
          
            />
</
            assemblies
          
          
            >
<
            buildProviders
          
          
            >
<
            add 
            extension
            =".rdlc" type="Microsoft.Reporting.RdlBuildProvider,
Microsoft.ReportViewer.Common, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" 
          
            />
</
            buildProviders
          
          
            >
</
            compilation
            >
          
        

and updated the /Views/web.config: (Replaced PublicKeyToken=31bf3856ad364e35 with PublicKeyToken=null)

          
            <
            pages 
            validateRequest
            ="false" pageParserFilterType="System.Web.Mvc.ViewTypeParserFilter,
System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null, processorArchitecture=MSIL" pageBaseType="System.Web.Mvc.ViewPage,
System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null, processorArchitecture=MSIL" userControlBaseType="System.Web.Mvc.ViewUserControl,
System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null, processorArchitecture=MSIL"
          
            >
<
            controls
          
          
            >
<
            add 
            assembly
            ="System.Web.Mvc,
Version=2.0.0.0, Culture=neutral, PublicKeyToken=null, processorArchitecture=MSIL" namespace="System.Web.Mvc" tagPrefix="mvc" 
          
            />
</
            controls
          
          
            >
</
            pages
          
          
            >
<!--
          
          
            <pages validateRequest="false"
pageParserFilterType="System.Web.Mvc.ViewTypeParserFilter, System.Web.Mvc, Version=2.0.0.0,
Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL"
pageBaseType="System.Web.Mvc.ViewPage, System.Web.Mvc, Version=2.0.0.0, Culture=neutral,
PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL" userControlBaseType="System.Web.Mvc.ViewUserControl,
System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35,
processorArchitecture=MSIL"> <controls> <add assembly="System.Web.Mvc,
Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL"
namespace="System.Web.Mvc" tagPrefix="mvc" /> </controls>
</pages>
            -->
          
        

This morning when I turned on my development computer I had the intention to re-factor some WPF user controls but every time I tried to open any of them in the designer Visual Studio 2008 will crash without any warning.

When I opened the Application error log I found the following message: 

Log Name:      Application
Source:        .NET Runtime
Date:          3/26/2009 11:07:53 AM
Event ID:      1023
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      SRV.Dev.CyberBizSoft.com
Description:
.NET Runtime version 2.0.50727.3074 - Fatal Execution Engine Error (70FC5FC0) (80131506)
Event Xml:
<Eventxmlns="http://schemas.microsoft.com/win/2004/08/events/event">
    <System>
        <ProviderName=".NET Runtime" />
        <EventID Qualifiers="0">1023</EventID>
        <Level>2</Level>
        <Task>0</Task>
        <Keywords>0x80000000000000</Keywords>
        <TimeCreated SystemTime="2009-03-26T15:07:53.000Z" />
        <EventRecordID>186149</EventRecordID>
        <Channel>Application</Channel>
        <Computer>SRV.Dev.CyberBizSoft.com</Computer>
        <Security/>
    </System>
    <EventData>
        <Data>.NET Runtime version 2.0.50727.3074 - Fatal Execution Engine Error (70FC5FC0) (80131506)

          </
          Data
          >
</
          EventData
          >
</
          Event
          >
        

After some online searching I found the following thread with this link to a hotfix to this problem.