.NET Tutorials, Forums, Interview Questions And Answers
Welcome :Guest
Sign In
Win Surprise Gifts!!!

Top 5 Contributors of the Month
Gaurav Pal
Post New Web Links

UserControl Resouces Singleton Instance Question

Posted By:      Posted Date: September 22, 2010    Points: 0   Category :WPF

Given, a viewmodel referred to in a UserControl reource like this:

 <local:MainVM x:Key="VM"></local:MainVM>

Everything works great with respect to finding resources etc.

Now the usercontrol has bindings like this:

      DataContext="{Binding Sour

View Complete Post

More Related Resource Links

question regading sql name instance in ms sql


Hi ...

I have a question regading sql name instance ???

When ever i create new instance in sql server 2005 , it use to create the new instance along with my PC name.

For Eg :

My PC Name is Web and New instance name is Busiwork it use to create like Web\Busiwork.

But i need just the sql instance name of my server as Busiwork.

How to do so ?? plz help me ???

SQL Server 2008 instance question



Is it possible to install a SQL Server 2008 without giving it an instance name?  So that my dotnet applications' connection string won't need to change to "data source:dbServer\Instance;...", and still can use the "data source:dbServer;..."
Thanks for help.


Question About singleton class


Just wanted to know if a singleton class could be inherited and derived.


Singleton Design Pattern in C#, Vb.NET

Ensure a class has only one instance and provide a global point of access to it.

Singleton Design Pattern in Asp.net using C#

When we want to make a only one instance of a class and also making sure that there is a global access point to that object then the design pattern we user is called Singleton. The pattern ensures that the class is instantiated only once and that all requests are directed to that one and only object.

Singleton Pattern-Creational Patterns

The Singleton pattern is a specialist creational pattern as it's primary focus is to facilitate a single shared instance of our object rather than to decouple our client from the object's implementation as with the other creational patterns.

Some basic MVC question

  1. In regular asp net I can run (debug) the application but I can either "view in browser" that gives me the option to view the application and write code on same time.

In MVC I can't find this option.

  1. What is the basic DATA MODEL for working with SQL DB.

I mean with no any framework (entity framework, Sub sonic, Link to SQL etc')

I look for basic application that works with data but with no fw.

  1. What is the popular DB framework that working with data.
  2.  I am looking on  mvc series


C# Soup To Nuts  (the best series ever)


I watch some of the MVC video, seems that the music store is good but I have to wait to the other part.

Does any one know and recommend   a Microsoft MVC tutorial?





Web Site to Web Application Question


I've been building web sites and for my next project I will be creating a web application.  I use a 'BasePage' class in all my projects but, since web applications do not contain the 'App_Code' folder, what is the best place/practice for the 'BasePage' class?



connection string question from a newbie


when publishing  in the webmatrix dialogue it asks for "destination connection string" for my "database.mdf"

I was not sure what it was so I pasted this from my web.config file :

Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\database.mdf;Integrated Security=True;User Instance=True

it all published ok, but wont run, so I guess it has somthing to do with this connection string or some kind of configuration issue.

My question is this, What should go in the field for "Destination connection string"

Security Question Answer Retrieval


I know there is a method built in for retrieving the encrypted password, but how do I retrieve the encrypted security answer?

What I want to do is have a member profile update screen that the end user can update their password and security question and answer. However, when they get to this page, I want to already be showing the security question (the easy part) and its answer (the not so easy part).

I have updated web.config with passwordFormat=Encrypted and have added a machineKey with the generator (forgot the link, but located on eggheadcafe somewhere).

I haven't done ANYTHING yet, since I already have a user store with hashed information. I wanted to get some functionality done before publishing, wiping the store and recreating users (only a couple developers).


Very Basic Question - Error message running first page


Hi Everyone,

I am running Windows 7 and I have gone into Control Panel and activated all of the IIS Functions.

The web application I am running was downloaded from the net (and has worked on other machines previously).  Once I downloaded it, I moved it into C:/inetpub/wwwroot/code/main.asp

I am a bit of a novice at this!  But I am hoping someone can point me in the right direction!


I get the following error when I try and run the web application through IE:

"An error occurred on the server when processing the URL. Please contact the system administrator. If you are the system administrator please click here to find out more about this error."

(When i click the "click here" button it just goes to the IIS site).


Appreciate any help I can get!




C#, LINQ: (List<>) Question???


Hi Everyone,

I have a strange problem:


There is an entity (Table) called "Filters" in my .edmx which has all my tables and stuff in it (to use it for LINQ queries)

I have created a class called "CustomFilters" which inherits "Filters". So now my cutom class has all the properties of the original "Filters" class (table) and 1 more additional property that i wanted which is a List of "CustomFilters":

List<CustomFilters> children = new List<CustomFilters>();

Now i get all my records into:

List<CustomFilters> theOriginalList = new List<CustomFilters>();

NOTE: first all records are tken into a List<Filters> and then these are added into List<CustomFilters> where List<CustomFilters> for children of that record is added, and then children of the child records, and so on......

so now, every record is an instance of CustomFilters which has a property named "children" which is a list again; and each child again has instanaces of "CustomFilters", and each instance again has children...and on and on and on.....

(basiacally its a data source for a treeview in my silverlight control)

every thing is good and working as expected.


linqdatasource parameters question



I'm currently getting to know the linqdatasource control. What would happen if several WHERE parameters are added to the linqdatasource control declaritively in the aspx page but no WHERE clause is defined? 

1. is there any issue with setting up multiple WHERE parameters in the aspx markup for linqdatasource but then deciding which ones actually get used at runtime by setting the actual WHERE clause at run time? Would the unused parameters simply be ignored and cause no issues?

2. when you need to modify WHERE clause or WHERE parameters at runtime do you need to do so in an event handler? such as linqdatasource.selecting?
I see from the above link it is possible, but is that the standard way to handle controlling filtering in code behind for linqdatasource?

2b. if you use an event such as linqdatasource.selecting to add where parameters and/or modify the where clause in code will that also break the builtin sorting and paging support of the linqdatasource with a gridview? 

Singleton Pattern and Abstract Class


I know what Singleton Pattern means and Abstract class means.

What I wanted to know was how would this apply to real world.

Could anyone give me any good example or simple explanation.

Say I have a simple website, why would I use any of the above if any.

Why would it simplify my architechture.

Thanks in advace. 

database interface design question


For handy database interface, is it good to use SqldataSources exclusively intead of EntLib functions?

Thanks for any feedback.

Activation error occured while trying to get instance of type Database, key "DBName"


Im using Enterprise library 5.0
I have a scenario, where I have to access two different databases in my application.

Basically this application is a webservice,delployed on my local for testing purpose.
I'm trying to access this web method from diffent windows application, default connection works fine but the other database throw's exception.

Problem is only my defaultDatabase is works fine, if I change defaultDatabase="MYCON1" with "MYCON2" it works fine, if I try to access the other database which is not default, throws exception.

<dataConfiguration defaultDatabase="MYCON1" />
<add name="MYCON1" connectionString="Data Source=server1;Initial Catalog=dbName1;User Id=Username1;Password=password1;"

" />
<add name="MYCON2" connectionString="Data Source=Server2;Initial Catalog=dbName2;User Id=Username2;Password=password2;"
providerName="System.Data.SqlClient" />

Database myDB=EnterpriseLibraryContainer.Current.GetInstance<Database>(); --> works fine for the default database (MYCON1)

Database myDB=EnterpriseLibraryCo

SQL Server Express2008 R2 brings app down, instance problem


I have tried dozens of changes and modifications to many settings as I will outilne here and all to no avail.

The short answer here though is that I uninstalled SQL Sever Express 2008 R2 and went back to the "NON" 2008 R2 and got things working. But like the fool I am wanted to run on the more current rev and updated again, all problems returned....



Win Server 2003 R2 SP2


VWD2008 Express (removed)




XP Sp3

VWD2008 Express

SQL Server Express 2008


I was orginally getting this message after updating to SQL Sever Express 2008 R2, I removed VWD 2008 Express from the web server, no good, then uninstalled SQL Server 2008 Express R2 and reinstalled SQL Server 2008 Express. worked but had issues, couldn't install MGTM Studio. Then I removed SQL 2008, cleaned folders and reg. Reloaded SQL Server 2008 Express, still flaky, couldn't get the Management Studio to install. So I removed it again and used the Web Platform Installer, which worked but loaded 2008 R2 again. Which brought back the message.

Failed to genera

ASP.NetWindows Application  .NET Framework  C#  VB.Net  ADO.Net  
Sql Server  SharePoint  Silverlight  Others  All   

Hall of Fame    Twitter   Terms of Service    Privacy Policy    Contact Us    Archives   Tell A Friend