How Messages Flow Between Computers Connected With Internet Or LAN
Jun 15, 2010
I have been doing Windows programming in .Net since last two years. Now I am shifting to web programming so I just stuck in understanding the fundamentals of web programming, after googling I came to StackOverflow to learn from all of you great guys.
My confusion is about how messages flow between systems in distributed enviornment ? I mean suppose I want to send a message "Hello" to a system connected to LAN or Internet, then what will be the steps taken to send the message.
Second thing is suppose my system is "A" and I wana send message to system "B" which is connected via a wire, so how the message flows on wire and how system "B" reads it from the wire ?
I am having a domain name and web space (the web is running, its ASP.net 3.5). I am working on a project in which I need to connect 2 computers over the internet.
Is it possible to do that with a simple ASP.Net website? What other things I do need to do this?
EDIT Actually I want to send the data from one computer to another in real time, I mean as we do chatting we exchange text to one another. The same thing I want to achieve.
For error messages, validation faults etc you have
ModelState.AddErrorMessage("Fool!");
But, where do you put success responses like "You successfully transfered alot of money to your ex." + "Your balance is now zero". I still want to set it at the controller level and preferably in key-value way, the same way as errormessages but without invalidating the modelstate.
when i test this page http://www.catalogues4u.com.au/ViewCategory.aspx?catID=119 im getting the above error. to replicate this issue visit the above page in ie7 and you will get the prompt.
I have a code to get a list of all the computers within a domain. Now i need to just get the computers which are within a particular OU and not the rest of the machines. so here is my code to get all the machines from a domain, this works perfectly fine:
we developped an ASP.NET application that runs fine on our development server and in our network computers. But in production, the application works when accessing it directly from the web server but not on the clients (code behind is not executing).
Getting an error whenever we click a particular button/link on our site. It is generating a javascript "Invalid Argument" error. I know in the other posts it is typically because it is a syntax error in the javascript however it only just seems to have started happening and it doesn't happen on all pcs.
ie. in our client's environment if I remote onto their web server and view the uat website I get the javascript error. If I remote onto their sql server and view the uat website I don't get the javascript error. If it was a syntax error then I would always get the error wouldn't I?
both browsers are the same version of IE6 (yeah I know...) :) I have tried deleting temporary internet files - including viewing the files and deleting them myself - but no joy.
client uses citrix.. and they're all getting the error :(
Update - I haven't posted specific code as there is too much to post (and I'm not sure where the error is occurring). The "button" launches a new window which in turn opens up a couple of aspx pages and calls lots of javascript. So the window opens ok, and there's a function that gets called to resize the window - but before it calls the resizing of the window/content it throws the invalid argument error. Am busy trying to get alerts to trigger to see if I can see where it's falling over but so far no luck.
Again not sure why this error doesn't occur when I use a particular PC (same browser version)
I have published ASP.NET web site, using IIS7 on Win7. I can access this web site on my localhost, but it is inaccessable from other computers via internet. I have tried to disable firewall and anti-virus program, but with no success.
Does anyone know what may be causing this problem?
i am using form authentication in my web application.
by default, form authentication allow 2 different users to log in from 2 different computer using same username and password. due to which i am facing some problem.
when user 1 clicks on menu i am maintaining the name of selected menu in a session. but if another user clicks on different menu then the session variable is set to the menu selected by user 2. due to which the 1st user is facing some problem as the value in session got changed.
How can i overcome this problem? is there any way, where once the user has logged in, no one can log in with same username and password from another computer?
i have a web application which can be accessed via intenet the application is running on iis and configured using a router..i m looking for a good solution where i can give access to only authorized computers rest of the computers cannot access the applcation for eg:- if i have a users in office1 in sales dept. and he access the application from his office, so i want to deny the same user or any other user, that he cannot access the same application from home or antwhere else.
I'm integrating a number of e-comm sites into different banks and decided the easiest method was to add in the dotnetcharge (www.dotnetcharge.com) library.It works well and means I can keep much of my code the same for each bank type and transaction.However, their support is a bit sucky (4 emails sent, 1 reply) and I'm utterly baffled on the 3D Secure issue.Does anyone have experience with dotnetcharge and 3D Secure?I have set the MerchantURL and the actual 3D Secure screen comes up - but I'm unsure how to get the system to 'flow' properly.Does anyone have any code examples or even pointers in the right direction?Failing that.This particular integration is with SagePay,which also has God-awful documentation and support. Code for reference is as follows;
ASP.NET, web form model.Is there any sample code/site that demonstrate a couple samples for regular website patterns/ templates? Like if I want to use tab to switch between different pages, should I put the code in a single page or in different page, and treat each tab as a page.Or if in a search page (just a single search bar and button), should I display my result panel in same page using dynamically enable the result panel, or just to another page? I want to find a general design pattern/ template.
Can any one please provide link for flow of query exection in sql
For eg. FROM, [JOIN CONDITION, JOIN TABLE ...], WHERE, GROUP BY, HAVING, SELECT, DISTINCT, ORDER BY, TOP
Suppose when we write query, how that query will get execute behind. I would like to know about that. Can you please provide ariticles or link related to this
I have a web portal designed in ASP.NET in which we ask customers to enter the data. On the click of submit button all i have done is, just read the data and called a stored procedure which inserts that into a table. There seems to be a problem in SQL Server 2005 while inserting the data from multiple computers at the same time. We have tested in our lab with three computers, result is that we get the data inserted successfully in only one machine and on the other two machines we get error on page. I have used transactions in the stored procedure and also tried setting the isolation levels to READ_UNCOMMITTED, SERIALIZABLE and SNAPSHOT. Nothing seems to work properly.
The problem is I have a laptop that I take to University with me to all my lessons and lectures and it has Visual Studio 2008 installed on it and I work on my assignments in Visual Studio just fine. However when I get home I would like to use my desktop PC which has the exact same copy even from the very same disk of Visual Studio 2008 that is installed on my laptop. The problem is no matter what I do I can't open and work with any projects that I have created on my laptop.
Now if I create the project on my desktop PC it will open just fine on my laptop and I can continue to work with the project but the minute I save and take that project over to my desktop I get the self same error message shown below. [URL] I did do a little research and I found what looked like a solution for some people and that was to change the "SQL Server Instance Name" to SQL2008. As shown below it was set to SQLEXPRESS which is the same as what it says on my laptop copy. [URL] But all this did was present me with a new message as shown below. [URL] Uploaded with [URL] I'm completely at a loss as to what the issue is. Both my laptop and desktop run a fully updated copy of Windows 7 64Bit and have the same copy from the same CD of Microsoft Visual Studio 2008.
I've started using ASP.NET MVC on a project and have gotten a few working pages, but I recently ran into a problem where data I was carrying through a hidden field didn't carry for some reason. I can think of a couple of possible reasons and I could try things until something works but I prefer to work on observable empirical data. Thus the point of this inquiry.
I've got a controller (several), a model (several), a view (several), and data in the browser for the JavaScript to chew on. I can unit test my JavaScript code. The browser / view interactions go over the wire, and I can capture that either with Firebug or (if I want to punish myself) Ethereal. I can write unit tests for the controller and for components of the model. The thing that appears to happen in a pure "black box" is the mapping between the model objects and the view form fields. Somewhere in that process, it tries to map data from form fields into model objects before it hands a request to the controller and it tries to map data from the model objects to form fields when it processes the response. Even with the helpers in play, this is a source of bugs. There can be spelling disconnects, or a page might be inadvertently missing one of the fields of a model object because it didn't use it. It would be nice to know if a field didn't map and why.
Since it is happening on the server, this seems like the handoffs should be unit testable or at least loggable. The problem seems pretty bounded. I can't be the first person to have run into this question. Are there any hooks I can use for this? What are the best observation points in the framework to tap the process, both incoming and outgoing?
how to put what i am looking for. The best i can describe it is a flowchart type of layout that shows your all your ASP.NET pages and how they are linked to one another.
I need to implement the following logic [URL] but this one you have to pay for to use commerical is there another way of doing the above in jquery or javascript for example?
