Gantt Chart - Validation - ASP.NET AJAX Gantt Demo

Auto Update Parent Tasks

Enable Dependency Validation

Enable Predecessor Gap

Subject

Start Date

Due Date


Johnson Residence Construction Project			1/1/2023	4/30/2023
	Planning and Pre-Construction Phase		1/1/2023	1/18/2023
		Architectural Design and Site Planning	1/1/2023	1/15/2023
		Engineering and Final Blueprint	1/8/2023	1/15/2023
		City Permits and Contracts	1/15/2023	1/18/2023
	Construction Phase		1/18/2023	4/9/2023
		Grading and Excavation	1/18/2023	1/22/2023
		Demolition and Removal	1/19/2023	1/23/2023
		Foundation and Concrete	1/22/2023	1/29/2023
		Rough Framing and Carpentery	1/25/2023	2/5/2023
		Inspection (Structure)	2/5/2023	2/5/2023
		Electrical Rough-in	2/6/2023	2/19/2023
		Plumbing Rough-in	2/19/2023	2/19/2023
		Heating and A/C	2/19/2023	2/26/2023
		Drywall	2/25/2023	3/10/2023
		Painting (Exterior)	3/7/2023	3/21/2023
		Interior Carpentery (Interior)	3/17/2023	3/29/2023
		Flooring and Interior Paint	3/26/2023	4/9/2023
	Final Phase		4/9/2023	4/30/2023
		Review-Punch List	4/9/2023	4/23/2023
		Final Inspection	4/24/2023	4/24/2023
		Final Paperwork and Documents	4/24/2023	4/30/2023

The DevExpress ASP.NET Gantt control (ASPxGantt) allows you to validate relationships between tasks and handle errors. Set the EnableDependencyValidation property to true to enable task validation.

The Gantt control supports the following dependency validation rules:

Finish to Start (FS) - A successor task's start point should equal the preceding task's end point.
Start to Start (SS) - Successor and predecessor tasks should begin at the same time.
Finish to Finish (FF) - Successor and predecessor tasks should end at the same time.
Start to Finish (SF) - A successor task's end point should equal a preceding task's start point.

Dependency rules specify that you can move only the successor to create or change the gap between tasks. Set the EnablePredecessorGap property to true to increase/decrease the gap between the tasks with a predecessor.

The Gantt control also has the AutoUpdateParentTasks property that enables validation for parent&child relationships:

A parent task's duration equals a summary duration of its child tasks.
A parent task and its first child starts at the same time.
A parent task and its last child ends at the same time.
A parent task's progress is a summary progress of its child tasks.

The control processes changes in task values before they are saved to a database. The control displays a popup window with a list of available actions if an error can be handled in several ways.

Local Copy of this Demo
To inspect the source code for this demo on your machine, you must first install our components via the DevExpress Component Installer.

You can open a local copy of this online demo directly from this webpage (if using v20.2.8, 21.1.4 or higher).

Open CS Solution

Open VB Solution

The source code files for this demo are installed (by default) in the following directories:
\Users\Public\Documents\DevExpress Demos XX.X\Components\ASP.NET\CS\ASPxGanttDemos
\Users\Public\Documents\DevExpress Demos XX.X\Components\ASP.NET\VB\ASPxGanttDemos

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