I have a web application based on vb.net
I used MsgBox() in my MYPage.aspx.vb where my expectation is that the user on client should click on a button and based on it I would process further.
But I heard a suggestion the MsgBox() is working fine in my code cause on developer machine(my dev box) webserver is running locally. This does not work on a remote web server or in any hosted environment outside of a local server.
Is this true?
Is this true?
Yes. Server side code is executed on the server. The VB.NET Code Behind is executed on the server. You were seeing it on your development station because the server and client were the same machine.
If someone else were to browse to your server from another client, the dialog box would appear on the server and the user would never see it.
If you need to do a confirmation to the user, you need to use some sort of clientside code, like JavaScript and confirm.
There is no MessageBox in a web environment. It wouldn't make much sense to show a MessageBox on the server, but it compiles anyway.
So you either need to use a jQuery approach or a simple alert:
ScriptManager.RegisterStartupScript(page, page.GetType(), "MyScript", "alert('Hello World');", true)
Related
I have built an application that connects to the exchange server and does some scanning tasks on the incoming mail.
Application has a form where i can start and stop scanning,give in an interval, do some other configuration, and a notificationicon in the taskbar to show hide,end and so on..
The problem is that I would like the application to start as a service, because now a user has to log in first on the server before it starts working.
I tried some tools like RunAsService, i had a service, but obviously it didn't run the application.
Of course i understeand now that when the application will run as a service, scanning will be the only thing that will happen, no forms and no notification icons.
However i do not know where to start, should i extract the scanning logic from my configuration as a separate application? What application type should it become then ?
You have two easy options.
First one just create a new Windows Service Project from your New Project button in the Visual Studio, and then just program your app.
Second one, just create a service from the service management window in your computer and add the executable file of your program. It will start running as a service (with visible windows and everything as you coded it).
You should follow this link and schedule your vb.net windows program as windows task
In Your code, at the end ,when everything gets executed you should write Me.Close() to hide your form.
Very frustrated with all of this, hoping someone can assist.
I had a Silverlight application and WCF working together without issue for a year. In order to get them working, I had some pain initially but finally worked through it with help. All of the pain came from configuration/security, 401's, cross-domain hell, etc.
The way I have everything setup is that I have a WCF service that resides in it's own application/directory and runs in its own application pool.
On the same web server (IIS7), I have another application/directory with the Silverlight application that points to the aforementioned service.
The server name (for this exercise) is WEBSERVER1. We've created a CNAME for it that is WEB1. In the past, if the user went to http://WEB1/MyApp/ or http://WEBSERVER1/MyApp/ it would work. Suddenly yesterday it started behaving badly. Normal users started getting the Windows challenge/response prompt (and even if they entered the info they would get a 401 error).
My WCF service runs in a site that enables anonymous access (and this has always worked).
My Silverlight application runs in a site that has windows integrated (and this has always worked), since I capture the Windows username when they connect.
For the record, I did create a NEW application pool yesterday with an ASP.NET application that runs in it. This seems to work fine, but there is a chance creating this new application pool and application/directory has caused something to change.
I have a clientaccesspolicy.xml in my wwwroot folder, as well as in the folder for each of the two applications above (just in case). I have tried to promote NTLM over Negotiate as a provider (as that worked for another issue I was having on another server).
After trying some changes, I can't even get the thing to behave the same each time I call it. Sometimes it will prompt me for credentials. Other times it will work, but then say it failed to connect with the WCF service with a "not found". Other times it will actually work fine, but only if I am using the actual server name and not the CNAME. When using the CNAME I always get the crossdomain error, even though I have the cross-domain xml files in every directory root.
This is a nightmare, and makes advanced algorithm analysis seem fun and easy by comparison. Did Microsoft realize how difficult they made this combination of (IIS7/WCF/Silverlight/providers/permissions/cryptic or missing error messages) to get to work??
I found a solution that appears to be working.
In this case, I had to change the authentication mode for the default web site (which hosted the clientaccesspolicy.xml file) from anonymous access to Windows Integrated. I don't understand why this worked for a year or so and then stopped, but it seems to have resolved it.
The new application that I had deployed yesterday was a standard ASP.NET web application, which I put in it's own application directory and it's own application pool, to ensure that it would not cause this sort of issue. I'm still not even sure if it did.
The way I resolved it was by trying to navigate from my PC to the actual http://servername/clientaccesspolicy.xml file, and that was giving me a 401 error. I switched from anonymous to windows integrated on that default website (which has nothing in it except for that xml file) and that resolved the permission issue. I then had to permission the actual AD groups to have read access to that folder (if not they got the user/pw prompt and could not get through).
I want to pop a browser with a given url from within a windows service. Like so:
System.Diagnostics.Process.Start("http://www.venganza.org/");
Works fine when running in a console but not from within the service. No error messages, no exceptions, the Process.Start() command just seem to do nothing. It smells of some security issue, maybe something with the service properties and/or logon options? Annoying stuff this... Anybody? (Oh, and on windows 7/.NET framework 3.5.)
A service should never pop up anything to the user. Don't do this with a service.
You will problably need elevated rights to do this aswell. You will have to sign in as the user.
Even if you manage to do this, don't. This is not what services is ment for and it is really bad practise. If you really want someting to pop up, have a seperate process instead.
It is popping up, but on the Window Station associated with the service.
I would suggest that you tweak your design such that your service doesn't need to interact in this manner. There are ways to get it to appear on an interactive desktop (you'd have to cope with issues such as impersonating the relevant user, targeting the correct desktop if nobody is logged on or if more than one person is logged on, etc.)
Just on a side note Windows services aren't built for interactivity. They are used to process behind-the-scenes type stuff. However, have you tried enabling the Interact with Desktop option on the service itself?
I know I've had this problem when I started working with Silverlight, but I can't for the life of me remember how to fix it.
I created a new RIA service application using the standard tutorial, added a table from the database and added a grid to display the results. Works great. Now I pull open the Web properties and change the web project to "use local IIS Web server". Suddenly the application will load up and give me the friendly "NotFound" error.
Please, someone remind me what I'm missing here.
I ran into this problem recently, and resolved it with help from this post on the silverlight.net forums.
Basically, I had Windows authentication and annonymous access enabled at the same time, and I need to disable windows authentication and restart IIS.
John
Not sure what the missing part is but I always start with Fiddler as will show the messages going across the wire. The actual messages can contains far more useful that the browser is hiding from the Silverlight plugin
Example:
The user login to the webpage => Click on a button
This action starts the executable "CreatePrettyPicture"
The file "prettypicture.jpg" is created on the server
When the user reloads the page the pretty picture "PrettyPicture.jpg" is shown on the page.
If I could start the application with a parameter it would be even better.
The server is a using Debian and as web server I'm using Apache. Please let me know if you need more information about the server configuration.
The possibility of several users clicking on the button at the same time is not a part of the problem.
You need to read up on CGI Scripts.
It's also possible that PHP is already available on your server, but I wouldn't recommend using it unless you're already familiar with it and know all of the security pitfalls, which from the question appears very unlikely.
You would be better of using a server side script with your apache installation to start the executable. This is probably easier with PHP (which should be easy to install if it isnt already), here are the commands. As long as you dont actually use any input with the page it should be safe enough.