Introduction : The Parallel activity allows multiple activities to execute at the same time. This does not mean the Parallel activity permits parallel processing across multiple threads - only a single thread will execute inside of a workflow. Instead, the Parallel activity allows separate branches inside the activity to execute independently.

Let see how to create Parallel activity :

Step : 1 Create an Workflow Console Application.

  • Open Visual Studio.
  • Select File->New->Project.
  • Select Workflow Console Application.
workflow.gif

Step : 2 Drag Flowchart activity to the designer to place the different activities anywhere on the palette.

flow-chart-activity.gif

Step : 3 Drag a FlowSwitch activity to the bottom of the Workflow.

fcc1.gif

Step : 4 Drag a WriteLine activity to display a standard greeting message and set the Display Name Winter, Spring, Summer , Autumn and Default.
fcc2.gif

Step : 5 Drag a Parallel activity to the bottom of Workflow. Draw a connection from each of the WriteLine activities to the Parallel activity.

fcc3.gif

Adding the Branches :

Step : 6 Double click in Parallel activity and drag three WriteLine activities. One of these activities will display the

  • Date.
  • Time.
  • Day of the week.

Enter one of these expression for the Text property on each of the WriteLine activities.

Expression :

"Time: " + DateTime.Now.TimeOfDay.ToString()
 "Date: " + DateTime.Now.Date.ToShortDateString()
 "Today is: " + DateTime.Now.ToString("dddd")

fcc4.gif
Step : 7 Open program.cs file and write a code.

Code :

using System;
 using System.Linq;
 using System.Activities;
 using System.Activities.Statements;
 namespace WorkflowConsoleApplication11
{
class Program
 {
static void Main(string[] args)
{
WorkflowInvoker.Invoke(new Workflow1());
Console.WriteLine("Hello");
Console.WriteLine("Press Enter to exit");
Console.ReadLine();
}
}
}
Step : 8 PressF5 and run application.

result.gif