Challenge:
I tried to add a CheckBox control to the registration page in my newly implemented open source YetAnotherForum asp.net application. And this CheckBox is for Terms and Conditions agreement, so it needs to be checked before the users submit registration form. It looked like the easy way was to use a RequiredFieldValidator to validate the CheckBox control. But unfortunately this RequiredFieldValidator validation Web control does not work with the CheckBox (or CheckBoxList) Web controls. After I set its ControlToValidate property to the ID of the CheckBox, the page threw an HttpException, saying:
"Control ‘controlID’ referenced by the ControlToValidate property of ‘validationControlID’ cannot be validated."
Ok, I can perform the validation check in the postback code or replace the RequiredFieldValidator with CustomValidator control. But this is for a constantly updated open source application, I did not want to change too much source code in case I will get overwritten in the next release. So, I need a quick and dirty way to do this.
As 
When I was approached by a co-worker to come up a quick solution to design a training registration application. The requirement is to display all upcoming training events in calendar view and allow users to register to each training. And upon the registration is submitted, the training department and the user’s supervisor should receive notifications immediately (although not required now, but might need the approval from the supervisor in later development). The deadline is very…, how to say it, … how about this afternoon. Well, while the co-worker asked how to design the database tables and asp.net coding, I suggested why not giving the SharePoint a shot. Since I am the one proposed, then I had to create it for her.
Challenge: How to display an image in a column of ASP.NET Gridview based on the data from a database table. For example, I have a GridView to display some speakers’ profile with name, address etc. Within it, I need to display a clip icon in the column of “Speech” to indicate that this speaker has a speech document attached. 
With the upgrading to ASP.net 2.0, I decided to change all my sending email codes too. Basically I am going to use system.net.mail instead of system.web.mail or traditional CDONT. I thought it would be an easy task, but I still encountered some issues.
Today finally I got the Visual Studio 2005 installed on my new computer, and tried to move all visual video project from my previous VS 2003 to it. After I open the previous project in VS 2005 and converted and then re-built, then I tried to open the application in the browser. But I got the following error message:
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