.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

Workflow or DataModel is caching objects somehow.

Posted By:      Posted Date: September 20, 2010    Points: 0   Category :ASP.Net

Hey there!

A just wanted to ask one really awkward question.

As you can see from my post title, my question is - can workflow or DataModels context cache data somehow, when it isn't necessary?

Let me explain a little bit better:
My projects consists of client side (asp web forms) and services (DataModel and some workflows).
Steps what i'm making to reproduce that wierd bug:
1.When i open browser data is immediately filling some textBoxes with data from DB.
2.After that, i'm changing one of the values in my DB.
3.Refresh browser (F5)

4.Click button which will launch workflow in services
5.Realize that workflows processed data with OLD values, which i have been changes recently in DB.

How could it be?
I'm taking "fresh" values all the time from DB (thry my .edmx datamodel), but getting an old value!
Thank you!

View Complete Post

More Related Resource Links

Can you persist objects inside a workflow?

Can an object used inside a workflow be persisted?

Caching data to share between workflow instances


I have a wf4 workflow that correlates an SMS message to an internal input channel. For part of the workflow I have a code activity that uses LINQ to SQL to load up a bunch of input channels (rows from a table) from a SQL db. For each workflow instance, the query is run each time against the db.

Is there a mechanism or model people use to cache this sort of stuff (table data) so that each workflow instance can use that instead of re-querying?

Free Series of SharePoint Workflow How-to Videos

This is the series of "How to" Document Workflow with SharePoint using Visual Studio 2008 (using the .NET Framework 3.0 for backward compatibility to Visual Studio 2005). I have created video's that show the most common requests that I have seen around MOSS/SharePoint 2007 workflow & document workflow.

ASP.Net Caching problem ??


I'm having a problem with an asp.net 3.0 application using a gridview to display data.  The problem seems to be that despite a brand new .selectCommand being sent to the sqlDataSource, the gridview starts displaying data from *someone else's* query.  For example, user A is logged in and will be working fine until a few page submissions later when the gridview data starts suddenly showing information that belongs to another user. 

This is my first asp.net application, though I've been working with classic asp and ADO for years so I'm used to sending a SQL string and getting back the results from that string.  Apparently there is a complex caching system which is interferring which I do not at all understand so at this point I just want to stop the server from caching any data whatsoever.  Is this possible?

Any and all help will be much appreciated!!

Need help with objects and arrays


I have an objuct that I declared like this:

    Class DailyStats
        Dim _day As String
        Dim _hour As String
        Dim _impressions As String
        Dim _clicks As String
        Property Day() As String
                Return _day
            End Get
            Set(ByVal value As String)
                _day = value
            End Set
        End Property
        Property Hour() As String
                Return _hour

is the page caching?


I am just trying to understand the basics flow to the MVC framework by putting in some breakpoints in the beginning of the actions of a couple of controllers.

One break point is at the HomeController/Index action where it just returns View() of the "Welcome to MVC".  The Second break point is at a SecondController/Index action where it uses the Entity Framework and returns a View() of a list from the db.

When I run this in debug, it breaks at the points I expected when I go from Home page to the Second page controller and back to Home.  However, when I go to the Second page again, it doesn't break at all?  Is the results of the Second page being cached and how and where?  How do you trigger for it to get check if data is old?

I check to see if the persistence is done on the db, by changing the value of a field on the db side and it still did not cause it to break on that action and displays old information in the view.  I am concerned because it is displaying incorrect values on the UI.  I do not have the OutputCache attribute above this action or specified any cache on my web.config.

Thanks in advance for your time :)

How to check for null/empty strings on dynamic objects?


What is the proper way to check for null or empty strings on dynamic objects? This is the only solution I've found so far:

if (admin.PasswordHash.GetType() == typeof(DBNull) || admin.PasswordHash == string.Empty)

If the field is null, the object returned is DBNull.Value, but if the field is empty string, it's return as a System.String object. This makes it impossible to do regular "admin.PasswordHash == DBNull.Value" check, as that will fail whenever the field has been set to empty string. Is my example the right (and only) way to go?

Data caching c#.net


Hi Friends,


I have a large SQL Database in the server from which I can create a dataset of about 10000 rows. My question is about caching this data. Which type of data caching should I choose (Server side or Client side)? Which one will provide better performance?


Thanks in advance

how to serialize objects ??


Is there any way or process to serialize the the objects?? i am trying to store the instance of few control in viewstate but it shows error msg that it is not a serialized object. should i perform some steps to serialize the objects ???

Class which contains an array of objects of type "Class2"



1  Partial Class _Default
2  Inherits System.Web.UI.Page

3 Public Function Ohjoy(ByVal X As Integer) As Integer
4 Dim theClass As New Class1 '= New Class1()
5    theClass.ReSize(0)
6    theClass.myBaby(0).GetName(0) = "Hello" 'Property Chars is read only'
7    Return 1
8 End Function
I have a first class named "Class1". I have a second class named "Class2" Class2, is a member of class 1,
and is implemented as an array of objects of type Class 2.

If I try and call the Accessor GetName() my hard coded value "Hello" in my accessor is not returned? Only
an alpha character like "T"

Also if I try and assigne a value using the setter GetName() it does not work, and the compiler gives me
an error message "property Chars is ReadOnly? Does anyone know what is wrong in my code? Line 6 above


Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
End Sub
End Class

Public Class Class1
    Dim bs As Integer
    Public myBaby() As Class2
    Public myB As Class2
    Public Function ReSize(By

Cutting Edge: Expando Objects in C# 4


The .NET Framework 4 introduces some new features that enable you to go beyond static types. We explore dynamically expando objects and demonstrate how they can be used like dynamically updatable dictionary objects.

Dino Esposito

MSDN Magazine July 2010

SOA Tips: Address Scalability Bottlenecks with Distributed Caching


SOA makes application scalability easier, but getting the best performance out of your SOA means paying close attention to the details. We'll give you some tips for coding your app more effectively and using distributed caching to remove data access bottlenecks.

Iqbal Khan

MSDN Magazine June 2010

Workflow Services: Visual Design of Workflows with WCF and WF 4


The .NET Framework 4 makes it easier than ever to implement WCF services using WF. We'll demonstrate just how easy it is by modeling a long-running, durable and instrumented workflow based on a real-world business case without having to write any code.

Leon Welicki

MSDN Magazine May 2010

Workflow Essentials: Collaborative Workflow Improvements in SharePoint 2010


In this article, the author covers the new features in SharePoint 2010 geared for workflow developers and then walks the reader through a couple of new user scenarios.

Paul Andrew

MSDN Magazine November 2009

Foundations: Workflow Services for Local Communication


This month's column describes how to use WCF for communication between a workflow and a host application in Windows Workflow Foundation 3. This knowledge should help developers with their efforts using WF3 and prepare them for WF4, where WCF is the only abstraction over queues (referred to as "bookmarks" in WF4) that ships with the framework.

Matthew Milner

MSDN Magazine November 2009

Toolbox: Distributed Caching, Object-Object Mapping, Blogs and More


This column covers Web application performance with distributed caching, a utility for object-object mapping, and a look at interesting blogs.

Scott Mitchell

MSDN Magazine September 2009

Cutting Edge: Pros and Cons of Data Transfer Objects


After a brief refresher on procedural and object based patterns for organizing the business logic layer, the author focuses on data transfer objects and the impact they have on the development of the software project.

Dino Esposito

MSDN Magazine August 2009

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