API Reference: MaxLengthAttribute Class

This attribute is but part of the .NET System.ComponentModel.DataAnnotations namespace.

The MaxLengthAttribute can be applied to string-based content model properties. The attribute sets the maximum allowed character length of a string property value. The back office will display a validation error if the property value length is more than the specified maximum. If the property type is a collection (f.e. IList<string>), every value in the collection is validated individually.

You can combine this attribute with the MinLength attribute to specify a min/max length range.


Decorate the model property with the MaxLengthAttribute. Pass the maximum allowed length in the attribute constructor.


The following example sets a maximum length of 50 characters for the Title property (as well as a minimum length of 10).

public class SampleContent: IContentType
    public string Title { get; set; }

    // ...