Validating in c
Figure 04: Prebinding Validation Errors(Click to view full-size image) There are actually two types of validation error messages - those generated before the HTML form fields are bound to a class and those generated after the form fields are bound to the class.
In other words, there are prebinding validation errors and postbinding validation errors.
Once again, the model binder gives up and adds an error message to model state.
In particular, the model binder cannot assign a null value to the Units In Stock property.
In my windows form projects , i have validated the fields using Boolean method.
Find the below sample screen shot for validating the fields before saving the data Img 3: Validation method Here I have validated the fields using the Boolean method, If all the field values are entered properly it will return true, other wise it will return false and will display an error message.
So before saving data, I want to validate whether all the required fields are filled (Text Boxes) by the user. I would rather use a generic function that would be passed each control on the form and based on the type of the control, separate validation logic would be written.
in case extra validation like restricting validation to some of the controls only, that would be decided at the function calling level.
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If you submit the HTML form for creating a Product, and you enter an invalid value for the price field and no value for the Units In Stock field, then you'll get the validation messages displayed in Figure 4.