I have a simple asp.net page that knows how to call some commands.
For example, i call mstsc.exe with specific parameters:
Process.Start("mstsc.exe", "/v:" + serverToConnect);
When i use this code on my local machine it works fine.
When i upload this code to an asp.net page on different server and try to click
on the button call this command, nothing happened.
I guess i need to somehow tell the page to call this command from the machine of the user who clicked this button.
Do you know what is the best way doing it?
Thanks.
Not possible.
Stop for a second and imagine the havoc unleashed upon the internet if any website could arbitrarily execute applications on any user's computer.
It works on your local machine because, by coincidence alone, when you're testing it your machine is both the server and the client. The behavior is still the same, the application runs on the server. When you publish it to another server, that behavior continues... The application runs on the server.
Whatever you're trying to accomplish, this is not a feasible approach. It sounds like you want to install a client-side application on users' computers, which is a very different thing than an ASP.NET web application.
Running this code from a web page will result in the process executing on the server. It is not possible to run this code on the local machine from an asp.net page.
All .NET code in an asp page runs on the server.
Related
We have an ASP.Net application used by many customers installed on their own servers. Because it is installed on their end with each having different databases and URL bindings etc I created a console application a while ago that gets a zip file and extracts it to c:\inetpub location to append the latest application changes. This console app is added to scheduled tasks to create an automated update.
Obviously when anyone accesses the site for the first time after it does this they have to wait a little longer whilst the site rebuilds. I changed the console application to include a Process.Start(urlofapp) so that it should hopefully do this as part of the update so the next morning that first user doesn't have to wait for the rebuild.
I have tested it ok running myself but not yet released as my concern is that this url process is kept open. Can anyone enlighten me as to whether this would be the case as I don't want this to happen or can give me any ideas as to how to rebuild the site manually as part of the console app.
IIS has had an auto-start apps feature for quite some time. You just have to enable it. You can find more info from the Gu, and the IIS site.
Safer instead to use a start page which loads everything on the server in the background. If you do this logic in an async method which in turn is called from an MVC controller for example then this can potentially run whilst the main page has finished. Alternatively use a threaded Task and show a start page that is only returned whilst setup is taking place.
I have done plenty of C# shell command calls, apps, batch files etc. The other day I was asked if it would be a problem if an executable that I currently run from my web site app, would move to another server on our intranet.
In other words the web site app and the executable that I am running through Process.Start(...) are located on the same box currently - all good there. Now there is a wish to separate the two on two different servers.
I done a few futile attempts to execute an app (located on server B) from server A (where the web site resides).
Is there a way that I have not run cross yet to do this ?
Thanks
PsExec is one way with minimal coding. Using System.Diagnostic.Process, you can call this command:
psexec \\ServerB (path)\myapp.exe arg0 arg1 ...
To control the processes of server A by running an application on server B, you would need an application running on server B that would get controlled remotely somehow.
As an example, let's say server A runs unix, so you could write a application that would connect to server A using ssh, authenticate and then control the processes and whatnot like you do in a shell. If server A does not allow ssh connection, you could write your own application that would be running on server A listening to some connection and commands that would come from an application in server B.
It's quite hard to understand what are your current settings and why would you even want to switch the application from server A to server B, so a little more information would wield you a better answer.
Austin's PSExec approach is probably the easiest approach to executing an EXE on a remote machine, but you may want to consider a potentially more robust solution:
You could modify your command-line app to run as a service and to respond to requests for work and/or data via a WCF (binaryXML/TCP or XML/HTTP) call.
I am developing a project for college and i need some suggestions over the development. Its a website which shows information from other websites like Links, Images etc.
I have prepared below given model for the website.
A Home.aspx page which shows data from tables (sql server).
I have coded a crawler (in c#) which can crawl (fetch data) required website data.
I want some way through which i can run the crawler at back end for some time interval and it can insert updates in the tables. I want that i can get updated information in my database so that Home.aspx shows updated info. (Its like smaller version of Google News website)
I want to host the wesbite in Shared Hosted Environment (i.e a 3rd party hosting provider company and that may use IIS platform)
I posted simliar situation to different .NET forums and communities and they suggested lot of different things such as
Create a web service (is it really necessary ?)
Use WCF
Create a Console application and run windows task sheduler (is it okay with asp.net (win forms website) and in shared hosted)
Run crawler on local machine and update database accordingly. (No i want everything online) etc etc
Please suggest me a clear way out so that i complete the task. Please suggest elobrated technology and methods which suits my project.
Waiting...
Thanks...
Your shared host constraint really impacts on technologies restrictions.
In theory, the best way to host your crawler would have been a Windows service, since you can take advantage of windows services configuration. A service is always up, can be automatically started at startup, writes errors in event log, can be automatically restarted after failure...
Then, you Home.aspx would have been a regular website in IIS.
If you really stay on a shared host (where you cannot setup a service), I would have make the crawler as a module which is run on your application startup.
Problem is, IIS application pool doesnt live forever if your web site is not in use, and it may stop the crawler. It is configurable, but I dont know how much in a shared host.
In IIS 7.5, think about starting your module at application warm up
Finally if you need to run the crawler at interval times (like every day at midnight), if your shared host does not let you set task scheduling, think about Quartz Framework, which allow you perform task scheduling inside your application (without the intervention of the OS)
Integrate your crawler code into a aspx page
Setup a task scheduler on your host to call that page every X minutes
When the page is called check that localhost has called the page
If localhost called it run the crawl routine and
If localhost hasn't called it throw a 404 eror
I want to run an exe on client system from my c# asp.net website. When I use Process.Start()
it throws an error:
The requested operation requires elevation.
How do I set permissions to run that exe?
You can't spawn processes on the client machine from server-side code.
When you use Process.Start in server-side code, it is attempting to execute the process there, on the server where the website is hosted. If you wanted to create processes on the clients computer then you would need to expose a download for them (and not in employing subterfuge, like malign sites might do to install software - supply it gracefully, and normally (and with permission)), or a Silverlight application or something along those lines.
The bottom line is that the code you want to execute (even if that is just to spawn a process) must reside on the client, and be executed there.
You can't run an application from a web server like that. You will have to have the user download the application by supplying the EXE, a setup file or using ClickOnce.
Or you can develop an ActiveX control that you can have the browser automatically download from a Trusted Internet Zone.
Once downloaded, proper signing with a certificate (signed from the trusted (corporate) root certificate) will avoid the user getting a prompt to ask whether he wishes to allow the ActiveX control to install/be activated -
The ActiveX control can subsequently do anything the interactively logged on user could. This means that to actually install a program you'd need to elevate (UAC on Vista+); But if the goal was just to run a standalone executable, you should be good to go.
This all assumes white-hat purposes in a (larger) corporate setting, because it relies on PKI infrastructure and central browser policies, to name just two.**
This would, really, lead to some excellent questions on serverfault or superuser
I noticed you said you wanted to run an exe file on the client, but you didn't say explicitly that the exe is on the server and you want to push it to the client. Everyone seems to be assuming that is the case.
You CAN accomplish this fairly easily with a small JavaScript if you have a few prerequisites:
The executable is already present on the client machine.
All of your clients are running IE
You can enforce a policy to put your site in the Intranet or Trusted
Sites zone.
So basically this means it's a corporate intranet application. I am assuming this is probably the case since, well, if you were expecting to do this with a public app, I would be surprised.
For the script to accomplish this, please see my answer to this question:
How can I get a program on a client machine to run from an ASP.NET page?
I am working on a web application which will allow users to take exam online. When the user clicks on take test I need to block the calculator app. Is there a way to do that?
I am using asp.net,c#,visual studio 2008
Absolutely not. Your code is executing on your server, and the calculator is running on their PC. You can send JavaScript, Flash, Silverlight, etc. that is executed, but they run in a sandbox - can't affect anything outside the browser runtime. You wouldn't like it very much if websites could manipulate your PC would you?
This is not possible unless you force the user to install custom software on their computer. And if we go into that, this has nothing to do with the web anymore.
And to be honest, if you don't have any control over the environment the user is in... what's preventing them from opening whatever software you're trying to block on a laptop sitting next to the computer running the exam?
if you are in a Web application, you cant control your client machine. Only you can control your browser by using javascript or silverlight etc.
You have to install some extra windows application to protect that