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Making a verbatim string
In the preceding line, you need to specify the key-value pairs within the parentheses. The key is notepad.exe. If you try to put a path such as c:\data\samplefile.txt directly into your code, it doesn't work. You see how it gets underlined red? The popup says Represents text as a series of Unicode characters. These things don't work. So, to fix this, you put the @ (at) symbol in front of it. Now, you have a verbatim string.
With the old approach, this is how you handled this: c:\\data\\samplefile.txt. This is called character escaping. If you try this with the preceding line, notice that the red underline goes away because c:\ already means something. So, to escape the usual meaning, you add the second backslash. This is the old way, though. The new way for this situation is to use a verbatim, string so that it's interpreted exactly as it appears.
In this context here, Notepad is the key and the value is the samplefile.txt file.
Next, enter the following line directly beneath the preceding one:
filePrograms.Add("iexplore.exe", "http://www.bing.com");
So, Internet Explorer will open the http://www.bing.com page. You see?