Reimbursement multilevel Approval workflow in ASP.net (state machine version)

The reimbursement multilevel approval workflow in the previous ASP.net, referring to a specific project on the Web, the project with state machine workflow completed, based on learning reasons, I use sequential workflow, event-driven approach to achieve the same function. Later, I learned the state machine, and realized the state machine is also very convenient. Below I share a few of the main activities in the state machine workflow.

The difference between sequential workflow and state machine workflow:

Sequential workflow is a predictable, the process is more fixed, and the state machine workflow unpredictable, mainly by external event driven to achieve, external interaction is more, the state of the system needs external events trigger to change.

State machine Workflow Activity diagram: