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As you'd need to create a driver to do this, you can't accomplish this in C#. The reason that this is the case is that you can't have the managed runtime running safely in ring0. You can't even run in User Mode Driver Framework to achieve this.
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Umm Silly answer but have you tried looking for a USB to Serial Driver on the web,
two main types Prolific & FTDI (I questioned Pete yesterday on how to get the details of an FTDI driver) any way installed the driver, plug the device in to the USB port, cross your fingers (not needed but recommended!) look in Device Manger under the Ports option (it may also appear in pop up balloon on the desktop temporarily) as a COM number say COM6
then open COM6 and talk to it with a terminal emulator, Hyper-terminal is not great for this but will do, important to note Hyper-terminal (free version at least) will crash as it does not handle virtual serial ports properly.
When you say you don't want to third party tools is due to copyright restrictions or safety reasons (Prolific & FTDI are tested and can be used as part of an assembly have a look at the restrictions on the web site)
Glenn
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hello
I am last semester student my project to design application find photos please help me
by c#
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i'm not sure how to help, but you can check this link, guess number two is what you need.
best luck on your project. 
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They are in the wardrobe, in the attic. There, we've found the photos. You can put your feet up, safe and secure that you know exactly where they are.
But wait. Have you actually checked they are there? Go ahead, I'll wait.
They are? Good.
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I looked, but they aren't in my attic. I think your algorithm needs a little tweaking.
No wait! Here they are! They were on my NAS all along! 
Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water
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Ahh, sounds like you have a faulty attic. Is it still under warranty?
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I am sure he won't be allowed to submit those photos in his project 
When I was a coder, we worked on algorithms. Today, we memorize APIs for countless libraries — those libraries have the algorithms - Eric Allman
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I don't see why not. They are very...tastefull.
Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water
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OriginalGriff wrote: They are very...tastefull
I bet they are bahhh, wait for it, utiful! 
"With sufficient thrust, pigs fly just fine."
Ross Callon, The Twelve Networking Truths, RFC1925
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Only the ones with furry hips!
Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water
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Pete O'Hanlon wrote: They are in the wardrobe
I looked in the wardrobe but all I found was some strange looking guy with goat legs that went on and on about some witch and how cold it was. He didn't seem to know anything about pictures.
Why is common sense not common?
Never argue with an idiot. They will drag you down to their level where they are an expert.
Sometimes it takes a lot of work to be lazy
Please stand in front of my pistol, smile and wait for the flash - JSOP 2012
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Behind you! LION!
Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water
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OriginalGriff wrote: LION
and tigers and bears, oh my!
Why is common sense not common?
Never argue with an idiot. They will drag you down to their level where they are an expert.
Sometimes it takes a lot of work to be lazy
Please stand in front of my pistol, smile and wait for the flash - JSOP 2012
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With what? Since you haven't asked a specific question about the only help you're going to get is "WooHoo! Go for it! You can do it!". Cheering you on wasn't the help you wanted? Well then...
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i m very new in C# ,in my clients registration form
<td align="center" style="font-family: tahoma; font-size: 11px;">
<asp:Button ID="Button1" runat="server" Font-Names="Tahoma" Font-Size="11px" Height="22px"
OnClick="Button1_Click" Text="Register" Width="74px" OnClientClick="return IsEmpty();" />
</td>
on click button1_click function is geting called,but i can not find button1_click,nad if i remove the function its not getting postback
ASP.registration_aspx' does not contain a definition for 'Button1_C' and no extension method 'Button1_C' accepting a first argument of type 'ASP.registration_aspx' could be found (are you missing a using directive or an assembly reference?)
Plz help me to find solution for it
Thnx in Advance
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just check registration.aspx.cs and let us know....
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i cant find registration.aspx.cs in the folder
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i cant find registration.aspx.cs in the folder only 4 aspx files are dere
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hi,
As you are new with .NET , follow below simple step.
1) remove this button from page.
2) add button control through drag and drop
3) double click on button.
step 3 should create click event of the button and it should also create event handler in code behind page.
let us know if it works for you.
thanks
-Amit.
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Amit Answer is enough for you to solve your problem but I want to tell you about setting events in Asp.net Forms.
When you create control in Asp.net Form and then you want to create event for that,You can create event code in C# code of Asp.net Page.
Because of this you should set the type of event and name of it by tag in Asp.net page then go to the C# page of it and create the handle code for your event.
For example I want to create onclick event for button in my page.
First you write the button code in Asp.net Page same as this code:
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
Then go to C# page and create event for that button same as this code:
protected void Button1_Click(object sender, EventArgs e)
{
}
The important thing is the name of event in the tag and the name event in c# code should be same.
It's very simple and I believe you can do it so if it works let me know.
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thanks for mention my name in your answer
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Your Welcome Dear Friend.
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i'm new in C#, whenever i'm going to create an event sub in vb.net, i choose event inside two combobox below page tab, but in C# it's totally different.
then i figure it out by double clicking event properties, the sub will pop out in the code page.
nah this time, it's about dataset (datatable) event, both method above isn't working.
i've tried code converter and the output is "handles clauses are not supported in C#"
any suggestion?
uh and also, what's inside two combobox below page tab in C#? 
modified 5-Jul-12 5:52am.
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The two combo boxes are easy - the left is all the classes in the current file - click on one and it will take you to the start of the definition. On the right are all the objects in the class - again, click to go to definition.
The event adding in C# is the same for DataSet object (you can't add DataTables directly in the designer, so they are irrelevant here). Highlight the dataset, and look at the Properties pane. Click on the Lightning Bolt button to switch to the Events view, and double click the event - there are only three for a dataset anyway, and it it unlikely that you would want to handle any of them as a beginner in C# - Disposed, Initialized and MergeFailed are events I've not needed to override yet!
To add event handlers for a DataTable, you have to add it to the DataSet via it's Tables property, then select the table in the Property pane Objects drop down list. You can then access the events via the Lightening bolt button as before.
Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water
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