How to create own foreach activity workflow in c#

getting conversion error we can not convert 

Severity    Code    Description    Project    File    Line    Suppression State
Error    CS1503    Argument 1: cannot convert from 'System.Activities.ActivityAction' to 'System.Activities.Activity'    Excel    ForEachDataTableActivity.cs    31
    Active
 

after adding body control above text box showing read only

Demerits:

1. Creating a custom activity involves understanding the workflow framework and implementing the necessary interfaces, which can be more complex compared to using built-in activities.
2. Custom activities require ongoing maintenance and updates to ensure compatibility with future versions of the workflow framework.
3. Debugging custom activities may require additional effort, as issues could arise from custom implementation logic.
4. Creating custom activities requires knowledge of the workflow framework and associated technologies, which may have a learning curve if you're new to the concepts.

Using a custom ForEachWithBodyFactory activity, as described in the modified code snippets, has its merits and demerits:

Merits:

1. Creating a custom activity allows you to tailor it to your specific requirements and integrate it seamlessly into your workflow.
2. Once created, the custom activity can be reused across multiple workflows, saving development time and effort.
3. The custom activity encapsulates a specific functionality, making the workflow design more modular and easier to understand.
4. You have control over the behavior and implementation details of the activity, allowing you to customize it as needed.

1. Modify the `MyActivity` class to inherit from `NativeActivity` instead of `NativeActivity`:
 

public sealed class MyActivity : NativeActivity, IActivityTemplateFactory
{
    public ActivityAction Body { get; set; }

    protected override void CacheMetadata(NativeActivityMetadata metadata)
    {
        metadata.AddChild(Body);
    }

    protected override void Execute(NativeActivityContext context)
    {
        context.ScheduleActivity(Body);
    }

    Activity IActivityTemplateFactory.Create(System.Windows.DependencyObject target)
    {
        return new MyActivity
        {
            Body = new ActivityAction()
        };
    }
}

2. Update the `mydesignerpage` XAML file to bind the `Body` property instead of `Child` property:
 

By making these modifications, you should be able to create a custom `ForEachWithBodyFactory` activity and use it in your workflow without needing to pass an `IEnumerable` with a `DataTable` name.