# DTO: Data Transfer Objects A Data Transfer Object (DTO) is a plain C# object used by WebMap to communicate the necessary data from between the different layers, typically the data sent in them is the following: * Visual properties needed to render a control component and dictated its behavior in the UI. Properties such as Visible, Enabled, BackColor, among many others. * Event handler’s information, similar to what can be found in a desktop control the WebMAp controls implement the required events that need to be bound in order to be able to execute any action, a DTO has the responsibility of indicating which are the events that are needed set. * Object references, a DTO is a plain object design to hold only value types (string, Boolean, numeric, dates, etc.), however, the objects that they represent may have references to other complex objects, such as a Parent control, that need to be sent as well in other to represent objects hierarchy. A DTO class does not have any kind methods, they serve as a contract between the server and the client layers. If a model property needs to be sent to the front-end it must necessarily be included in the DTO specification. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.gapvelocity.ai/webmap/general/backend/dcp-desktop-compatibly-platform/library-bundles/bundle-dto/dto-data-transfer-objects.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.