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this is video number 17 of the invoice management system and it is time to validate our data lets look at how to do that in django and its a very short one in fact we only have to work with the forms if i scroll down you get a c all we need to do is to add some functions to our already existing invoice form so this is the form that we used to input data into the application but as it is we dont have any restrictions we can allow the users to input empty or none in the fields so thats what we want to prevent im gonna start the server and well look at what we have and how we can prevent that okay im gonna do money to py run server good so now that the server is running lets run the app localhost column8000 my machine seems to be running very slow okay so the application is right here lets look at add invoice this is where we have the form so this is the form that we have lets see i think my css files are not working okay anyway so lets proceed now i have a form like this if i