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I'm working with doctor patient portal in where patient need to book appointment for that when any patient choose one slot for appointment it need color change to green and it should show an alert message book successfully , when any other patient choose same slot it should change color red and show alert message it is booked already. Moreover appointment id should be auto generated how can I write simple code for that.

What I have tried:

I don't know how to do this... someone please help!
Updated 2-Nov-22 5:58am

ASP.NET and simple don't go together well I'm afraid, maybe you can find some inspiration here:
GitHub - aadeel/GreenHospital: An ASP.NET MVC 5 online appointment system[^]

Another idea might be to use: Magic[^]
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While we are more than willing to help those that are stuck, that doesn't mean that we are here to do it all for you! We can't do all the work, you are either getting paid for this, or it's part of your grades and it wouldn't be at all fair for us to do it all for you.

So we need you to do the work, and we will help you when you get stuck. That doesn't mean we will give you a step by step solution you can hand in!
Start by explaining where you are at the moment, and what the next step in the process is. Then tell us what you have tried to get that next step working, and what happened when you did.

If you are having problems getting started at all, then this may help: How to Write Code to Solve a Problem, A Beginner's Guide[^]
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