# Task

In this help article you can find helpful information on the different types of **RadGantt tasks**, their properties and methods.

## Task Types

Depending on the **TaskType** property, the **Task** can be one of three types:

* **Regular Task** - regular task which can have assigned resources, links to predecessors, start date, end date,duration and percentage of completion.

* **Summary** - a grouping of child tasks. The **Summary** has a **Start** and **End** determined by the earliest **Start** and latest **End** of its child tasks. The percentage of completion is calculated based on the percentage of each child task. The **Summary** does not have links to predecessors, and can not be referenced as such by other tasks.

* **Milestone** - a regular task with zero duration.

## Task Properties

The table below demonstrates some general properties of the **Task** object.

| Name                | Type                                      | Description                                                                             |
| ------------------- | ----------------------------------------- | --------------------------------------------------------------------------------------- |
| **Dependencies**    | Telerik.Web.UI.Gantt.DependencyCollection | Gets a collection of dependencies to other tasks.                                       |
| **Description**     | string                                    | Gets or sets the task description.                                                      |
| **Duration**        | TimeSpan                                  | Gets a value indicating the duration of the task.                                       |
| **End**             | DateTime                                  | Gets or sets the end time of the task.                                                  |
| **Expanded**        | bool                                      | Gets or sets a value that determines whether the tasks is expanded in the **TreeList**. |
| **ID**              | object                                    | Gets or sets **Task** ID.                                                               |
| **OrderID**         | object                                    | Gets or sets **OrderID** field used by sort operations.                                 |
| **Owner**           | Telerik.Web.UI.Gantt.IGantt               | Gets or sets the **Gantt** that is owner of the task.                                   |
| **ParentID**        | object                                    | Gets or sets pointer to the parent task using its ID.                                   |
| **PercentComplete** | decimal                                   | Gets a value in percent indicating the task completion.                                 |
| **Predecessors**    | Telerik.Web.UI.Gantt.DependencyCollection | Gets a collection of the dependencies that are predecessors of the task.                |
| **Start**           | DateTime                                  | Gets or sets the start time of the task.                                                |
| **Successors**      | Telerik.Web.UI.Gantt.DependencyCollection | Gets a collection of the dependencies that are successors of the task.                  |
| **Summary**         | bool                                      | Gets a boolean value indicating whether the task is a summary task.                     |
| **Tasks**           | Telerik.Web.UI.Gantt.TaskCollection       | Gets all children tasks of the current task.                                            |
| **TaskType**        | Telerik.Web.UI.Gantt.TaskType enumeration | Gets a value that determines the type of the task.                                      |
| **Title**           | string                                    | Gets or sets a value that determines the title of the task.                             |

## Enforcing a maximum task depth

Use **ParentID** to enforce hierarchy rules at the provider, web-service, or persistence boundary. For a two-level hierarchy, allow a new or moved task to have no parent or a parent whose own `ParentID` is empty. Reject an insert or update when the selected parent already has a parent. Apply the same validation to reordering operations that drop a task over another task and create a child relationship.

The client `OnClientInserting` event can provide an earlier UI check, but it is not a replacement for server-side validation. This article does not document a RadGantt context-menu event or a supported per-task API for hiding the built-in **Add Child** command. Do not use RadTreeView context-menu events for RadGantt.

## Task Methods

The table below shows the publicly accessible methods of the **Task** object.

| Method                 | Parameters                     | Return type                                       | Description                                     |
| ---------------------- | ------------------------------ | ------------------------------------------------- | ----------------------------------------------- |
| **GetData**            | none                           | System.Collections.Specialized.IOrderedDictionary | Returns the Task data as an OrdrederDictionary. |
| **LoadFromDictionary** | System.Collections.IDictionary | void                                              | Loads the **Task** data from a Dictionary.      |

## See Also

* [Server-side Programming Overview](https://www.telerik.com/products/aspnet-ajax/documentation/controls/gantt/server-side-programming/overview)

* [RadGantt object](https://www.telerik.com/products/aspnet-ajax/documentation/controls/gantt/server-side-programming/objects/radgantt-object)

* [Dependencies](https://www.telerik.com/products/aspnet-ajax/documentation/controls/gantt/server-side-programming/objects/dependencies)

* [Assignments](https://www.telerik.com/products/aspnet-ajax/documentation/controls/gantt/server-side-programming/objects/assignments)

* [Resources](https://www.telerik.com/products/aspnet-ajax/documentation/controls/gantt/server-side-programming/objects/resources)

* [Overview demo](https://demos.telerik.com/aspnet-ajax/gantt/examples/overview/defaultcs.aspx)