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CLR Inside Out: Managing Object Lifetime

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

Although the .NET Framework provides a managed execution environment, it is important to consider object lifetime management and write code that uses and releases resources correctly. The CLR team shows you how.

Tim Fischer

MSDN Magazine November 2007

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Remoting: Managing the Lifetime of Remote .NET Objects with Leasing and Sponsorship


Leasing and sponsorship is the solution for managing the lifecycle of a remote object in .NET. Each object has a lease that prevents the local garbage collector from destroying it, and most distributed applications rely upon leasing. There are several ways in which objects and clients can extend the lease, including dedicated sponsor objects. In this article, the author explains leasing, shows how to configure it, and how it relates to the various remoting activation models. He then discusses design guidelines and options, along with their impact on throughput and performance. Additionally, he introduces a helper class used to automate the management of lease sponsors.

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Cannot access Label inside Repeater - "Object reference not set..."


I have a button on a page with a Repeater and an ObjectDataSource. To give credit where credit is due, the Repeater's paging functionality is courtesy of ScottGu. (However, I'm using ASP.NET 4.0 and SQL Server 2008, as opposed to ASP.NET 2.0 and SQL Server 2005.)

Anyway, in the button's click event, I need to access the Text property of a Label that's inside the Repeater because it's used as an input parameter in a stored procedure. I'm getting a NullReferenceException when trying to access the Label's Text property. I have researched this error and have tried a few different solutions (involving FindControl and the Repeater's ItemDataBound event), but I haven't been able to get it to work. Any suggestions, in VB or C#, would be greatly appreciated. The code is below.


<asp:Repeater ID="rptText" runat="server" DataSourceID="tbsDataSource">
<table width="100%" cellspacing="1">
<%-- some rows removed for brevity --%>

How to: Serialize Hashtable contained inside another object that is serialized as an array of object

Update:  I've added the entire program in a single block of C# text near the end of these posts that can be placed into a C# Program.cs file of a console project.   I have a class called MyHashtable that inherits from Hashtable and implements IXmlSerializable.  MyHashtable is contained inside another object called MyObject and I need to xml serialize an array of MyObject[].  Whenever I xml deserialize, the hashtable is deserialized, but only 1 of MyObjects from the MyObject[] array is deserialized.  The ReadXml uses "while (reader.NodeType != XmlNodeType.EndElement)" so I don't think the reader is consuming all of the xml internally.   Does anyone know why this is happening?  Thanks.    

Managing business object locks on application level

Today I worked out simple application side object locking solution for one server scenario. My motivation came from ASP.NET architecture forum thread How to solve concurrent site issue where one user asks for locking solution that works without changing database. Here is my simple and primitive solution that should help this guy out. I added also sample solution to this posting. My solution is simple: Create class for locked items. Create manager class that holds locks and manages them. Clear locks when session ends. Create page to release all locks. If you need something more serious then you should keep locks information in database or better than that - use some lock server. Also you may consider developing WCF service. LockItem class As a first thing let's create class that keeps lock information. I call this class as LockItem. This class doesn't hold references to locked objects - only type and ID as there are many business layers that doesn't use globally unique identifiers for objects. public class LockItem {     public Type ObjectType { get; set; }     public int ObjectId { get; set; }     public string SessionId { get; set; }     public DateTime LockedAt { get; set; } } LockItem class also contains property for session because otherwise it is not possible to kno

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page inside update panel doesn't refresh the session object after postback of any control



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Is there anyway where I could put all the controls in update panel and still refresh the session after any postback(dropdown selection)

Any help is greatly appreciated.

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Object Value lost in script component inside for loop container

Hi All,

I need your expert advice here,

I have 5000 records to transform into csv file and due to the application limitation, the upload module to upload those 5000 records only can be done by batch of 100-200 record at one time.

Because of this, i try to use for loop to split the records into a few files e.g EE_1.csv, EE_2.csv.

The records was retrieved and saved into an object variable (ResultSet) before entering the For Loop flow

The issue i encounter, when it was on the 1st loop everything was fine, it is manage to generate X Records i specified but when it go for 2nd loop, the ResultSet is returning 0 Records..when the actual total records is 5000

Anyone can help this newbie what are the mistakes i made ?

The logic is something like

Public Overrides Sub CreateNewOutputRows()
oledbAdapter = New OleDb.OleDbDataAdapter
dataTable = New DataTable

oledbAdapter.Fill(dataTable, Me.Variables.resultset)
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EndPoint = (StartPoint + Me.Variables.MaxRecord) - 1

If dataTable.Rows.Count - 1 < EndPoint Then
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lock an object to multithreads by using lock inside the object's class..



I have a main program that holds static object.

The program launches multi-threads. all of this threads access the same static objec.

Problem is that I don't wish to allow access the same object at the same time for multuiple threads.

I wish to use LOCK inside the object....inside the class....and not write LOCK in the threads. this is frustrating.

is it possible?

How do I do that?

Thinking about new C# method prototypes: object as dictionary

I recently had to write a small Flickr API. I know many .Net API for Flickr already exist but I needed one for a Silverlight application. Whatever, it's only about building some querystrings so I did it by myself. It's been an opportunity to think again about a classical question: how to pass parameters to a method ?

Imagine you have a generic method to call some Flickr functions.

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C# Object Oriented Programming

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Using ATLAS PopUp Control with Calendar inside the GridView Control

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