Asp net validating datetime
The validation support provided by MVC and Entity Framework Core Code First is a good example of the DRY principle in action. This Git Hub issue 4076 for instructions on adding decimal comma.
You can declaratively specify validation rules in one place (in the model class) and the rules are enforced everywhere in the app. Having validation rules automatically enforced by ASP. It also ensures that you can't forget to validate something and inadvertently let bad data into the database. Notice how the form has automatically rendered an appropriate validation error message in each field containing an invalid value.
Normally you'd just add the globalization tag under Perhaps I should use the short instead of the long specification ..
All that is done is to split the date string up into month, day, and year, and then to attempt to create a date time value from those parts.To see what each of the format identifiers means, please consult the relevant MSDN documentation.If you want support for another format string, please lodge an issue or send us a pull request. When the user enters the date iin the correct format and if the date entered is greater than today's date.. Text = "Date should be lesser or equal to current date." else 'put your code here when everything is ok. I changed the code a bit to have some sort of a user prompt when there's an error (lbl Prompt).Chameleon Forms provides a way for you to hook into the unobtrusive validation library that ASP.