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ADO.NET: Tackle Data Concurrency Exceptions Using the DataSet Object

Posted By:      Posted Date: August 21, 2010    Points: 0   Category :ASP.Net

ADO.NET provides many techniques for improving the performance of data-intensive applications and for making them easier to build. The DataSet, the hallmark of the ADO.NET object model, serves as a miniature, disconnected facsimile of a data source. While using the DataSet improves performance by reducing expensive trips to the database server, it also introduces the possibility of multiple users attempting to change the same data simultaneously, thereby generating data concurrency exceptions. This article examines the common causes behind data concurrency exceptions and presents techniques for overcoming them.

David Burgett

MSDN Magazine April 2003

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Unable to cast object of type 'System.Data.DataSet' to type 'DataSet'.

Specifications : VS 2008 & SQL 2005 Express
Unable to cast object of type 'System.Data.DataSet' to type 'DataSet'.
I'm getting this error in cliend app, while passing values to the wcf service(iis),
WCF Sevice code
  public DataSet ListofAccounts(string custidno)
    SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ConStrWestSideBank"].ConnectionString);
    SqlDataAdapter da = new SqlDataAdapter("select * from AccountDetails where vCustIdentityNo ='" + custidno + "'", con);
    DataSet ds = new DataSet();
    da.Fill(ds, "AccountDetails");
    return ds;
I'm unable to get this, i tried in many ways but no use, please help me. Follwing is the code,of button click event 
   ServiceReference1.ServiceClient svcobj = new

Posting data to ASMX and return Object for jQuery


I am using fluent NHibernate with WebForms and I am trying to build a page where I allow a user to post a status update on their profile page and I a using a .asmx WebService to post the data to the database and then returnig a StatusUpdate instance to the page to be used by jQuery. I have a couple problems.

1) First off when I return a string from the WebService(i was testing) the textbox where the user enters their status doesnt empty the contents. And since the page doesnt refresh even if I manally clear out the textbox and put in something else, it still posts the previous status to the database again. How do I fix this?

2) Secondly, when I return the StatusUpdate Object from the Webservice I cant the results to display anything. Like I sad, Im using jQuery to make an AJX call to the WebService.

Here is my code:

User Profile Page:

Status: <asp:Label ID="status" runat="server"></asp:Label><span style="font-size:.7em;"><asp:Label ID="statustime" runat="server"></asp:Label></span><br />
<textarea id="statusBox" rows="3" cols="40"></textarea><br />
<input type="button" value="Update Status" onclick="SetStatus(); return false;

Data Points: DataSet and DataTable in ADO.NET 2.0


ADO. NET 2. 0 sports some exciting enhancements to the core classes found in ADO. NET 1. x and introduces a variety of new classes, all of which promise to improve performance, flexibility, and efficiency.

John Papa

MSDN Magazine November 2005

Data Points: Handling Data Concurrency Using ADO.NET, Part 2


Enterprise development has been moving towards a discon-nected model in recent years and ADO. NET development is no exception. While the disconnected model of the ADO. NET DataSet offers great flexibility, that adaptability also means looser control over data updates than you get with a connected data access model.

John Papa

MSDN Magazine October 2004

Data Points: Handling Data Concurrency Using ADO.NET


One of the key features of the ADO. NET DataSet is that it can be a self-contained and disconnected data store. It can contain the schema and data from several rowsets in DataTable objects as well as information about how to relate the DataTable objects-all in memory.

John Papa

MSDN Magazine September 2004

.NET Exceptions: Make the Transition from Traditional Visual Basic Error Handling to the Object-Orie


If you're used to Visual Basic 6.0 and you're making the transition to Microsoft .NET, you will find that error handling is quite different from what you've used for years. Visual Basic .NET uses a more object-oriented solution to signaling and responding to unexpected problems while your program is running. This approach, called structured exception handling, has a number of advantages over the On Error statements provided in previous versions of Visual Basic. For instance, exceptions give you lots more information about exactly what went wrong in your app. To help you take advantage of this modern error handling paradigm, this article will show you how to raise and respond to exceptions, as well as how to create your own custom exception classes.

Jesse Liberty

MSDN Magazine November 2002

Building a Custom Data Grid: Performing Ad Hoc Web Reporting with a VBScript 5.0 Class Object


A flexible, customizable grid for displaying data is a useful tool for ASP developers. It allows Web visitors to customize their view of your data. This article takes the data grid presented in "Ad Hoc Web Reporting with ADO 2.0" by John Papa and Charles Caison (MIND, December 1998) and adds handy features such as a finds feature that supports multiple finds and a mode for adding and editing records. This version also improves response time by allowing asynchronous record download and it componentizes the code so it can be used as a standalone VBScript class object that can be reused in other pages.

Randall Kindig

MSDN Magazine July 2000

send data in class object from one page to another using session


hello everybody

now i hav stored all data like user name, data fatched from database of that user

and i stored that data and user name such as:

string strUserName="user name"

dataset ds =new dataset();// data of that user

now i wan yo send d whole data from my login page to user profile page

can anybody help me for that...................

and plz tell me that how much is this way is benifitial to send data from one page to another page

plz........kindly waiting for positive rply

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How to assign data from 1 DataReader into Parent/Child object??

Hi I have a parent & child table. Parent - User UserID UserName Status 1 Shallin A 2 How A   Child - UserAccess UserID Country Default 1 US 0 1 UK 0 1 MY 1 2 SG 0 2 HK 0 2 MY 1   I also have parent & child object class.       I would like to use 1 C# function and 1 SP to handle the retrieve portion but I have 1 problem. I'm not sure how to assign the value from Reader to the object.   I do something like this but I only get 1 country which is the last country. if (dr.HasRows) {     while (dr.Read())     {         User objUser = new User();         objUser.UserID = dr["User_ID"].ToString().Trim();         objUser.UserName = dr["UserName"].ToString().Trim();         objUser.UserStatus = dr["Status"].ToString().Trim();         UserAccess objUserAccess = new UserAccess();         objUserAccess.Country = dr["Country"].ToString().Trim();         objUserAccess.Default = dr["Default"].ToString().Trim();         objUser.UserAccessCollection = new UserA

Calling a method with a class object as parameter data type.

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Hi.How I can to transfer data from object to parameter?

Hi to All. I have class with object wich populated with data from Users Interface  now I need to transfer the data to Store Procedure SQL but i can to transfer the data only using Parameters how I can to get the data from object and to put it in @parameter? Thanks/
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