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Microsoft .NET: Implement a Custom Common Language Runtime Host for Your Managed App

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

While most application developers may not need to write a custom host, understanding what is involved provides a great deal of insight into the architecture of the CLR. After covering how the CLR is started and loaded into a process, how to set the available configuration options, and how a host defines application domains, this article explains how to design a custom host. Important concepts include making the right decisions about the application domain boundaries for the host, configuring them correctly, loading and executing user code, and resolving references to assemblies. Setting security policy and unloading application domains as the application shuts down are also explained.

Steven Pratschner

MSDN Magazine March 2001

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More Related Resource Links

.NET Remoting: Design and Develop Seamless Distributed Applications for the Common Language Runtime


Prior to the advent of .NET, DCOM was the underlying technology for remote communications between Windows-based applications. But DCOM is quirky to set up and configure and not as interoperable as it should be. In .NET, XML Web Services and .NET Remoting are a seamless and effective answer to the demand for tools to build distributed applications.This article provides a primer on .NET Remoting with insights into the internal plumbing. Important aspects of remoting, such as channels, object lifetime management, and clients for remote objects are discussed. In addition, some practical examples are provided.

Dino Esposito

MSDN Magazine October 2002

Security in .NET: Enforce Code Access Rights with the Common Language Runtime


Component-based software is vulnerable to attack. Large numbers of DLLs that are not tightly controlled are at the heart of the problem. Code access security in the Common Language Runtime of the Microsoft .NET Framework addresses this common security hole. In this model, the CLR acts as the traffic cop to assemblies, keeping track of where they came from and what security restraints should be placed on them. Another way the .NET Framework addresses security is by providing preexisting classes which have built-in security. These are the classes that are invoked in .NET when performing risky operations such as reading and writing files, displaying dialog boxes, and so on. Of course, if a component calls unmanaged code, it can bypass code access security measures. This article covers these and other security issues.

Keith Brown

MSDN Magazine February 2001

Common Language Runtime Debugging Services


Application has generated a exception that could not be handled.

Process id=0xb0c (2828), Thread id=0x910 (2320).

Click OK to terminate the application

Click CANCEL to debug the application.

Now ive dont all of that, when i click OK the message just disapears all the way, but when I click CANCEL a differnt message appears. It says,

No Debugger found.

Registered JIT debugger is not avilable. An attempt to launch a JIT debugger with the following command resulted in a error code of 0x2 (2). Please heck computer settings.

Cordbg.exe !a 0b0c

Click on retry to have the proess wait while attaching a debugger manually.

Click on Cancel to ab

Ajax toolkit error : System.InvalidProgramException: Common Language Runtime detected an invalid pro


I have website that uses .NET 3.5 and Ajax tool kit.  The strange thing is it works fine in two environments but it errors with the following error on production site:


Server Error in '/UPS' Application.

Common Language Runtime detected an invalid program.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidProgramException: Common Language Runtime detected an invalid program.

Source Error:

Line 13:     <aj:ComboBox ID="ComboBox1"  runat="server">
Line 14:     </aj:ComboBox>
Line 15:     <aj:MaskedEditExtender MaskType="Number" ID="MaskedEditExtender1" Mask="(###)" TargetControlID="txt1" runat="server">
Line 16:     </aj:MaskedEditExtender>
Line 17:   

Source File: d:\Search\UPS\TestAjax.aspx    Line: 15

Stack Trac

Common Language RunTime Debugging Service

     We have built application in C#. This exe works fine with small Reports. But failed and give following error message whenever we try to run a big reports/processes:

              ReportGenerator.exe Common Language Runtime Debugging Services
              Application has generated an exception that could not be handled.
              Process ID=0x14 (1300), Thread Id=0xe8(232)

               Click OK to terminate the application.
               Click CANCEL to debug the application.

Any help will be grate appriciated...


Microsoft's Collaborative Application Markup Language (CAML) Loop

discovered an interesting error recently while working with Microsoft's Collaborative Application Markup Language (CAML) that, surprisingly, had received no ink. Partly what surprises me about this is that the error may require you to rewrite large sections of your code if you haven't previously considered this SharePoint limitation. I'll start with some context, but first of all the error is:

How to Localize Windows Forms and Change the Language at Runtime

Localization is the process of customizing your application to a particular language, culture or locale. Visual Studio provides support for localizing Windows Forms with much ease. In this article, we will see how to localize windows forms and give the user the ability to change to his preferred language at runtime.
When you run a localized application, the appearance is determined by two culture values. The UICulture property is used to specify which resource files will be loaded for the form. The Culture property, on the other hand, determines how strings such as dates, numerals, and currency amounts are formatted.
Let us see the steps required to create a localized form. You can then expand this example and adopt the same approach for the rest of the forms in your project

How to implement custom HttpContext for each request under class that implements IHTTPHandler


Hello All,

I created an application and implemented IHTTPHandler for all incoming request ending with ".aspx" extension.

Under "ProcessRequest" module, I am creating an instance of HttpContext (with URL attributes different from my application's URL i.e. if I am working on localhost then speciying Yahoo.com as its URL) and assigning it to "context" which comes as method argument.

After redirection, an error is generated. Also, the custom HTTPContext is not passed to the requested page (default.aspx, in my case.)

Code is as follows.

    Public Sub ProcessRequest(ByVal context As System.Web.HttpContext) Implements System.Web.IHttpHandler.ProcessRequest
            Dim requestedUrl As String
            Dim targetUrl As String
            Dim urlLength As Integer
            'Save settings which will be used while redirecting to appropriate page
            requestedUrl = context.Request.RawUrl
            If requestedUrl.IndexOf("?") >= 0 Then
                targetUrl = requestedUrl.Substring(0, requestedUrl.IndexOf("?"))
                targetUrl = requestedUrl
            End If
            If targetUrl = Nothing Or targetUrl.Length = 0 Then
                targetUrl = requestedUrl
            End If

System.Runtime.InteropServices.COMException (0x800A03EC): Microsoft Excel cannot open or save any mo


Hello good people, 

I have this beast as an error. Did my research and found some posts here as well but did not do any good for me. 

Here is what I did. I had an error regarding issue rights with COM objects so I gave access rights under component services for Microsoft Excel application now I am getting this error. 

Here is some information regarding this

1. Gave rights to ASPNET and network service to my web app directory to try to fix this error. 

2. The exact same process works on my Windows 2003 server and my Windows 7 development machine. I am trying to get this going on a different windows 2003 machine that is outside of our domain.

3. Developing on windows 7 64 bit with office 2010 installed. Also excel 2010 is installed on my Web server

4. Here is the code that is causing the error: The last line is causing the error.:

            MyXl = new Microsoft.Office.Interop.Excel.Application();
            MyXl.Visible = false;
            MyWb = (Microsoft.Office.Interop.Excel._Workbook)(MyXl.Workbooks.Add(Missing.Value));
            int test = 0; 
            MySheet = (Microsoft.Office.Interop.Excel._Worksheet)MyXl.ActiveSheet;
            if (reader.HasRows)
                int InRow = 2; 
                for (int i = 0; i < Nu

CLR Inside Out: IronPython and the Dynamic Language Runtime


This column uses the .NET version of the Python programming languages IronPython to demonstrate the value of dynamic languages and the new Dynamic Language Runtime.

Bill Chiles

MSDN Magazine October 2007

Inside MSBuild: Compile Apps Your Way With Custom Tasks For The Microsoft Build Engine


Learn how you can use MSBuild to customize your builds. Since it ships as a part of the .NET Framework, you don't even need to have Visual Studio installed on your machine.

Sayed Ibrahim Hashimi

MSDN Magazine June 2006

The Perfect Host: Create And Host Custom Designers With The .NET Framework 2.0


The .NET Framework 2.0 introduces a set of classes that can be used to host designers right out of the box. With the understanding of designers you'll glean from this article, you'll be ready to host them in your own apps.

Dinesh Chandnani

MSDN Magazine March 2006

Cutting Edge: Implement Custom Cache Dependencies in ASP.NET 1.x


One of the most compelling improvements that ASP. NET brought to ASP programming was the Cache object. The Cache has some similarities to the Application object and is a container of global data (as opposed to session-specific data) that features a fair number of innovative characteristics.

Dino Esposito

MSDN Magazine July 2004

Error Handling: Throwing Custom Exception Types from a Managed COM+ Server Application


Exception handling semantics in .NET are based on type, so you can create custom exceptions that have their own properties and methods. In .NET, exceptions are first-class citizens, and since they're the built-in error handling mechanism, all .NET-compliant languages must support exceptions. In addition, COM+ services are available to .NET code as Enterprise Services, so you can leverage exceptions in your Enterprise Services design.In this article the author describes custom exceptions, throwing exceptions across COM interop boundaries, and working with Enterprise Services.

Bob DeRemer

MSDN Magazine March 2004

Office 2003: Host an Interactive Visio Drawing Surface in .NET Custom Clients


Microsoft Office Visio 2003 introduces a new drawing component that allows you to embed an interactive drawing surface into your application's user interface. You can drive the Visio drawing component from events in your host application or with data from a Web Service and an ADO.NET data adapter. The Visio drawing component supports the rich Visio application programming model, giving you control over how graphics are used and displayed on the drawing surface. This article explains how to embed the Visio drawing component into a C#-based Windows Forms client app that retrieves data from the Fabrikam 2.0 Web Service.

Mai-lan Tomsen Bukovec and Blair Shaw

MSDN Magazine December 2003

DCOM Interop: Generate Custom Managed C++ Wrappers for Easier COM Interoperation Using DCOMSuds


Now that you're writing managed code, you'll certainly want to use your existing COM components, but you can't simply call them directly. Instead, you have to wrap the COM component in a runtime-callable wrapper that acts as a proxy between the component and your managed code. While the CLR provides wrapper classes for this purpose, there will be times when you'll want custom objects to wrap your COM components. One way to get the low-level access you need to precisely control resource cleanup, pass security information, and get access to CLR features is to write your own wrapper class in managed C++. This article shows you how.

Vishwas Lele

MSDN Magazine August 2003

DHTML and .NET: Host Secure, Lightweight Client-Side Controls in Microsoft Internet Explorer


In the past, Web developers often used ActiveX controls if they wanted customized client-side functionality incorporated into their Web applications. Now, they can build objects supported by the Microsoft .NET Framework which are more compact, lightweight, secure, and seamlessly integrated. By hosting .NET Windows Forms controls in Internet Explorer, developers can realize many of their client-side Web development goals. This article adapts ActiveX concepts for use with Windows Forms, and builds a multifile upload application that demonstrates these techniques.

Jay Allen

MSDN Magazine January 2002

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