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

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

Unmanaged dll called from webservice

Posted By:      Posted Date: September 17, 2010    Points: 0   Category :ASP.Net
Hi there,I have a webservice that wraps an unmanaged C++ dll.  I'm wondering how I should handle state and multiple connections?  I'm thinking that the unmanaged dll will be shared across all connections...is this the case?  Note that I am using a shared host so I have limited abilities to modify IIS specifically.  If the unmanaged dll is not shared and will have a unique instance for every connection then I have nothing to worry about.  If it's the case it's shared then I guess I will have to persist the unmanaged state on a per-connection basis through a DB?Thanks!Craig Clayton

View Complete Post

More Related Resource Links

saving XML output from webservice


 I created a webservice that takes casenum as input and gives results as a dataset in an XML.

I could make a web client to display the resulting dataset in a grid view. Pls see my code copied below.

Now I want to create a console client that takes the casenum as input, to call the webservice and saves the resulting xml for further processing, but can't figure out how to just capture the xml to save. Here's the code for my web client. I would appreciate if you could help modify this tocapture the resulting xml to save file locally.

Thank You.

namespace ResultsWebServicesClient
    public partial class _Default : System.Web.UI.Page
        protected void Page_Load(object sender, EventArgs e)

        private void BindDataToGrid(string CaseNum)
            FG_Results results = new FG_Results();
            DataSet ds1 = new DataSet();
            ds1 = results.Get_FG_Results(CaseNum);
            GridView1.AutoGenerateColumns = true;
            GridView1.DataSource = ds1.Tables[0];

        protected void GetResults(object sender, EventArgs e)


HTTP Post and WebService


I am working on a application which will accept the data in the post request. My application also wants to expose a web service and want to call another web service. Considering all these 3 action that I want to do, can I create a single application which will have a web form which will accept the POST request and expose a web service at the same time.

Although it may be possible to achieve this, Is this a correct way of doing it?

Calling webservice from the server


I have a sample web service and aspx file. I deployed them to an existing website that contains classic asp files.

web-service: --- using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Services; [WebService(Namespace = "http://localhost/MyWebServices/")] public class MembershipRegisWebService : System.Web.Services.WebService { public MembershipRegisWebService () { //Uncomment the following line if using designed components //InitializeComponent(); } [WebMethod] public string HelloWorld() { return "Hello World."; } }

aspx.cs file: --- using System; using System.Collections.Generic; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.Services; public partial class CallWebService : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { MembershipRegisWebService mrWs = new MembershipRegisWebService(); Response.Write("Calling web service:" + mrWs.HelloWorld()); } }

It runs locally, but it shows an error when running it from the server:

Server Error in '/' Application. Compilation Error Description: An error occurred during the compilation of a resource required to service this request. Please review the follow

C# / Java webservice


I am writting a client applicatin that acesses a webservice written by another company.  I need to test against this webservice but since it is live I need another place to test with.  I don't have access to the code from the webservice but have added a reference to my project.  I would like to create a test platform using C# which will run on IIS and not Java.

I have created a basic webserive using both the NetBeans platform and the VS/C# platform.  The problem I am having is if I dynamically change the web address from one to the other my client application complains that the webservice is invalid.  I have verified all the calls are the same.

Are there any setting with VS/C# that allow me to configure it to behave more like the Java webservice?  I don't have the server support to host the Java application for full testing along with other problems using the Java version.

I have run both services in the "WCF Test Client" and can see where the WCF service uses the varibles for request and the Java uses body/request but can't get the WCF to follow that format.  I read somewhere about changing the OperationContract with SoapRpcMethod but then the mentod is not longer exposed. I also tried a Web Service in .NET 3.5 instead of a WCF server but that seems to be more trouble and does not

Printing crystal report from webservice



I am trying to print crystal repot directly from a C# application, which is calling webservice. I am able to display report in crystalreportviewer by passing the webservice call to datasource. However, is there anyway, I can print directly without showing the report?

Alternatively, I was trying return ReportDocument object from webservice, which would solve my problem, but I was unable to return the ReportDocument because of serialization issue. Is it even possible? Thank you


Use Unmanaged C++ class in .NET


Hi Everyone,

I have one project which is developed in unmanaged C++ code.

Now i want to use all unmanaged classes of C++ in .NET

I have one method called .NET wrapper in which i have to convert Unmanaged C++ class to managed C++ class which will then use as proxy class.

details for that are given in below link.


Is there any other solution for develop this?

CLR Inside Out: Marshaling between Managed and Unmanaged Code


Marshaling is an important part of .NET interop. It allows you to call into unmanaged code from managed code. This column will help you get started.

Yi Zhang and Xiaoying Guo

MSDN Magazine January 2008

.NET Internals: Examine Running Processes Using Both Managed and Unmanaged Code


There are plenty of times when you need to get information on running processes, not the least of which is during performance tuning. Using the techniques in this article and special .NET classes you'll see how to get a process' ID, name, priority, number of threads, kernel handle, and memory consumption, as well as its user-mode, kernel-mode, and total elapsed running time and put them to use in a custom app called AssemblyBrowser.

Christophe Nasarre

MSDN Magazine October 2004

Coroutines: Implementing Coroutines for .NET by Wrapping the Unmanaged Fiber API


Coroutines are a powerful feature of many programming languages including CLU, Scheme, Python, Ruby, and ICON. Coroutines can save processor overhead and reduce redundancy because they allow you to stop execution of a procedure midstream, return a value, and resume exactly where the procedure left off.This article shows how coroutines can be implemented for the .NET Framework by using the Fiber API and Managed Extensions for C++, and how they can be easily used with other .NET-compliant languages. This article also shows a sophisticated use of the runtime host for running multiple managed threads on a single OS thread.

Ajai Shankar

MSDN Magazine September 2003

Web Q&A: Who Called the Script?, Concatenating Binary Files, and More


This month find out which part of an HTML document has called a script, how to concatenate binary files, find a node, reference one script from another, build a GUI database front end in Access, and compare XML files.

Edited by Nancy Michell

MSDN Magazine August 2003

C++ and ATL: Use ATL Server Classes to Expose Your Unmanaged C++ Code as an XML Web Service


Throughout this issue, you'll read all about the promise of Web Services and how the .NET Framework enables Web Service development. Many people will also be building their Web Services atop C++ code and frameworks like ATL Server, particularly when performance is paramount. In this article, the authors show how fully functional Web Services are built using ATL Server and Visual Studio .NET. Beginning with unmanaged C++ classes, they add ATL attributes that make the code work over HTTP.

Kirk Fertitta and Chris Sells

MSDN Magazine December 2002

SOAP: Using ATL Server to Build an Asynchronous SOAP Client in Unmanaged C++


SOAP opens up a new world of Web Services, letting you make function calls across a network or the Internet. But this flexibility creates new problems when your app needs to wait for calls to return from halfway around the world. What you need is an asynchronous SOAP client that takes advantage of threading to continue execution while waiting for calls over the wire. This article covers the basics of building such a client with ATL.

Pranish Kumar and Bogdan Crivat

MSDN Magazine April 2002

Writing Data to database with jQuery Forms, ASMX Webservice, & JSON - help!



Can someone point me in the right direction on how to submit data from a jQuery form to a ASMX webservice? I have gotten everything on the form ready to be submitted to the database and now I am stuck on how to send it over using $.ajax(). Everything I have read tells me how to get data from a webservice and display it with jQuery, but not the other direction nor how to access the json data within the within the webservice service(similar to a Request.Form approach with ASP.NET forms).

In other words: 

1. What do I need to do to my webservice to make sure it can receive data from the jQuery form. 

2. What do I need to do in jQuery to receive an acknowledgement the save on the server side was successful. 

I can explain more if need be, but if there is a comprehensive tutorial on not only reading, but also WRITING data with jQuery, JSON, etc. I would love to get pointed in that direction. 

Webservice using socket layer programming



   I want to access a webservice in asp.net programming. This webservice was done using socket layer programming and also i am having the ipaddress and port address. Did any one know about how to access webservice using socket layer and if know let me know how to access the webservice. Thank you

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