New to C# – Why isn’t this working?

I have coded in basic before now, but I'm attemping to follow this tutorial to make a web based database in visual studio 2010. Now everything seems to be working, but when I try to debug and test, it comes up with this error message:

http://i.imgur.com/nNDPGch.png

The online help guide was next to useless since I've very new to this. Can anyone help me out? I can provide more details if they are needed – Thanks in advance

by jake12001200 via /r/csharp

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