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This is a solved problem, there are systems out there that tell you how many spaces are left in a parking station, although I wonder if they are simply working on a count in/out.
Why not consider surveillance camera with some sort of recognition algorithms that detect an object in a specified area. How are you going to display the vacant spaces for a driver, a bloody big screen somewhere or are you going to send it to a mobile device.
Once you work out the hardware infrastructure the building the application is trivial!
Never underestimate the power of human stupidity
RAH
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How do you plan to interface the pressure sensors with the software? You are going to need a microchip and a ton of ADC's, among other things, then to write firmware for the uC and then the easy part is sending the data via USB to the C sharp application.
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I think you would need to consult a civil engineering design firm for this one.
The reason you don't see this widely implemented already is because of its cost. You're not going to get away with using simple microcontrollers and pressure sensors.
The loads you need to deal with are far greater. What's the heaviest weight of a single axle of the heaviest vehicle your parking lot will accommodate? In the U.S., a 1-ton pickup (a 6,000lb vehicle) can put well over 3,000lbs on the front axle alone, and therefore that much weight on the sensor under the pavement in the parking spot.
The cost of one of those load cells is about $200+ in the U.S.
You'd also need to have considerations for motorcycles (can be less than 400lbs) and how people park them in a park spot, possibly missing your load cell altogether.
Then there's the cost of installation of a single load cell in a single parking spot.
Total up what it takes to install them, per parking spot, and you've got an enormous cost. Compare that to the expected cost savings to the business for telling people what spots are open. Oh! That's right! The owner of the parking spot didn't buy the gas for the customers! So, that savings for the owner of the parking spot is ZERO!
That's why you don't see this being widely used anywhere.
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Dave Kreskowiak wrote: Total up what it takes to install them, per parking spot,
Which is going to be quite a bit less than what it costs to maintain them over time.
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Well, I didn't want to scare him too bad! 
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I agree with Mycroft that the best solution is probably an image processing solution.
You could start with the Aforge library and make use of IP webcams.
Or checkout my Opensource webcam movement detection system [^]that is IP webcam enabled which makes use of Aforge.
(Warning the code is an example of how not to write .Net code however it was written around 5 years ago and I have learned a lot since...)
“That which can be asserted without evidence, can be dismissed without evidence.”
― Christopher Hitchens
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I Want that My logic in my dll file should be hidden just.
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Screaming out in angst will not get you a different answer than you got the other day. Obfuscation is what you are looking for. It will stop the casual inspection of the logic in your DLL.
Never underestimate the power of human stupidity
RAH
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Actually My work is that I have an Website in VB .NET.
I Want To convert it into C# and asp.net website.
My business logic is in a separate class file.So I want to convert it into a dll file.
My question is that is it possible to run both website pages simultaneously i.e.(asp. net and vb .net website) on same domain.
I want to convert the vb .net website in asp.net C# website side by side so that the vb. net website would not affect the task.
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We already told you what your choices are. Reposting the same question (and still yelling about it) will only get you flagged as "abusive".
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So what do you want? Could you explain it more correctly?
Don't you know the method of make DLL? 
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any someone can give me some solution about plate recognition with c# any reference or some code for me .,.,.,please Help me.,.,.,.,
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Plate as in something used when eating, a thing inserted into the mouth by a dentist, a slab of building material, a thing displayed on a vehicle.
Be clear what you are asking we are not telepathic. Now try and explaining in MUCH more detail what you want to achieve and maybe someone can point you to an article.
Never underestimate the power of human stupidity
RAH
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I'm trying to create a C sharp application that can run under elevated credentials and give full mailbox access or remove full mailbox access for groups.
I cannot get system.management.automation to work in Visual Studio as a reference, so most likely any solution involving that is out of the question. It displays a yellow triangle and exclamation point when I add it as a reference.
Thanks
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What version of the .NET Framework are you targeting? I have seen that icon when I was using, say, a .NET 4.0 assembly in a .NET 3.5 project.
AFAIK, PowerShell 3.0 requires .NET 4.0 and PowerShell 4.0 requires .NET 4.5 (I am not sure though)
Keep Clam And Proofread
--
√(-1) 23 ∑ π...
And it was delicious.
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I did not check that and I really hope that is it.
When I get to work tomorrow I will check that and any other ideas that anyone here posts.
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I was targeting 3.5.
I changed it to 2.0 just for the heck of it and it broke 4 references instead of 1, so I'm back to 3.5.
Any other thoughts?
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I found something interesting, I have an older project where this worked and will still compile.
The reference is to
C:\Windows\assembly\GAC_MSIL\System.Management.Automation\1.0.0.0__31bf3856ad364e35\System.Management.Automation.dll
But when I try and reference that, I cannot do so directly, but instead can only browse to
C:\Windows\assembly\ and when I see System.Management.Automation, I cannot select it?
Under properties, security is different, but most everything else is the same? Maybe you can't include that to a WPFBrowser application?
[edit]
I just created a generic forms application and then added the dll and it is still failing, so I guess it has nothing to do with the WPFBrowser application portion.
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Try editing the project file and adding
<Reference Include="System.Management.Automation" />
with the other references. I think that may work.
Keep Clam And Proofread
--
√(-1) 23 ∑ π...
And it was delicious.
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I have a c sharp dll that I can call a function within it, pass values and have it perform a task.
I would like to do this through a webpage by having a user fill out a few form boxes, press the submit button and have the button call the dll that is on the webserver and pass the values from the input boxes on the webpage, so the dll can then do its function.
I'd like to be able to write back to the webpage any success or failure messages as well.
Thanks.
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The button doesn't call the DLL on the server. Supposing your web application is written in ASP.NET, you bind to the Submit Click event and in the code behind the web page, you create an instance of the class that you are interested in, and pass in the values. What happens next really depends on whether or not the operation is quick - if it is, simply return the value. If not, you would have to spin this off as an asynchronous operation and put logic in place to periodically check the values.
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Thanks for the reply.
I'm going to try and create a wpf web application and work from there.
I've never done anything with c sharp and web related things, so this will be a first for me.
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What do you mean by WPF web application? WPF is a desktop technology. If you are talking about WPF/E, I would avoid that at all costs - it's extremely limited.
Are you talking about Silverlight by any chance?
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Not Silverlight. In Visual Studio, there is an option to create a WPF Web Application, so I've started writing something in that. Maybe it is wrong, idk, but it seems to be working so far in the IDE?
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