How Can I Disable URLScan
1. Go to the Control Panel -> Administrative Tools -> Internet Information Services
2. Click WebSites folder, right click to get Properties
3. Click ISAPI Filters tab, find URLScan in the list, click Remove button, then OK to save
4. From Command Prompt (Start -> Run -> Cmd), type “iisreset”, to restart IIS

How Do I Configure URL Scan
There is a configuration file located here:
<Windows Folder>\system32\inetsrv\urlscan\UrlScan.ini
Additional log files are also stored in that directory.
If you want to keep URLScan on your computer, you can check out Microsoft’s documentation.

How Did It Get Installed
I have no idea in my case. I didn’t bother to look into it further. I am guessing through some Windows Update or some unintentionally clicking.

// To Round 3.1415 to nearest integer -> 3
decimal result1 = Math.Round(3.1415m);

// To Round 3.1415 to the third decimal place -> 3.142
decimal result2 = Math.Round(3.1415m, 3);

// To Round 18.5m Up -> 19
decimal result3 = Math.Round(18.5m, 0, MidpointRounding.AwayFromZero);

// The default will round down (ToEven) -> 18
decimal result4 = Math.Round(18.5m, 0);

One advantage of the default for mid point rounding down, is if you are working with numerous fractions, the sums could be more accurate (if you keep rounding up all your numbers it could skew your results).

More Information:
You can round numbers of type decimal or double using .Net’s System.Math.Round() method. Returns a decimal. See MSDN doc for additional reference.

To Search a String for a Null character:

mystring.Contains(Convert.ToChar(0x0).ToString() );
//The hexidecimal 0x0 is the null character

To Replace all Null Characters in a String:

mystring.Replace(Convert.ToChar(0x0).ToString(), "");

Why Do I Need This?
It might help. I needed it when I got a nasty error message in a data layer that was using asp.net web services and soap to retrieve the data:
“There is an error in XML document hexadecimal value 0×00, is an invalid character”
Basically what happened is that a null character was pasted into a SQL Server database via an Access front end. When my asp.net app was pulling the data via a SOAP data layer, the null character can not be used in a XML document with UTF encoding. Which is the transport method of this particualr service. So the quick hack was to strip out the null character after the data pull but before the soap transfer back to the client.

What's a Math Parser
A math parser is simply a group of functions that you can use in your code to parse mathematical expressions. I shouldn't say simple because these libraries are fast and capable of complex calculations. In my case I am just interested in algaebraic functions (or math you would use in business). They still fit the bill perfectly.

I have been wanting to test a math parser to define and execute business logic for some time now. I finally had a chance when I client had requested some coupon functionality to be added to an online shopping cart.

Where Can I Get One
So the first step was to find a free math parser I could use in .Net. This was harder then I expected as there were no FOSS math parsers available. muParser was what I was looking for, but no .Net version.

I eventually found a inexpensive parser ($19.95) that included the source. I downloaded the demo, ran some tests, and found a winner (bcParser.NET).

So Now What
Here is how I used the math parser in the coupon component I did for my client. First off, let me give you a brief overview of basic functionality. The customer would be at the shopping cart page and would have a text box to enter a special coupon code. Once applied this coupon would discount the sub total on the shopping cart.

Here is a simple object for a coupon:

The three values above would be entered by the store admin for each coupon. The coupon code is the code the end user would enter to acitvate the coupon. The parserApply will contain the formala to determine when to apply the coupon. Now these formulas will be standard alegabraic functions as shown below but the really aren't useful unless you introduce optional variables that can be used in the formula. Some common ones would be the item category, item sku, an item total.

Here is an example:
1) A coupon for $5 off $10 or more in CD's:

So at this point you should be seeing that there is a lot of flexibility in the code. If the client wants to change the logic, it is simply a matter of updating the above formulas in the database. No code changes needed.

The coupon component that I put in place is obviously a little more detailed. As of date, it is working well and the client is very happy with the functionality.

Let me know if you have any questions or comments.