Annotate Required Field Text For Free

Data annotation makes those connections. It's the human-led task of labeling content such as text, audio, images and video so it can be recognized by machine learning models and used to make predictions. Data annotation is both a critical and impressive feat when you consider the current rate of data creation.

Remarks. The RequiredAttribute attribute specifies that when a field on a form is validated, the field must contain a value.

ValidationAttribute, has an important property, ErrorMessage. This property get or set the custom validation message in case of error.

The Required attribute indicates that a property must have a value; in this sample, a movie has to have values for the Title , ReleaseDate , Genre , and Price properties in order to be valid. The Range attribute constrains a value to within a specified range.

We'll use the following Data Annotation attributes: Required Indicates that the property is a required field. DisplayName Defines the text to use on form fields and validation messages. StringLength Defines a maximum length for a string field.

We can easily add validation to our application by adding Data Annotations to our model classes. Data Annotations allow us to describe the rules we want applied to our model properties, and ASP.NET MVC will take care of enforcing them and displaying appropriate messages to our users.

A short definition of Data Annotation Data annotation is simply the process of labeling information so that machines can use it. It is especially useful for supervised machine learning (ML), where the system relies on labeled datasets to process, understand, and learn from input patterns to arrive at desired outputs.