# Dynamic Activity - .NET SDK

> This section explains Dynamic Activities with the .NET SDK

## Set a Dynamic Activity 

**How to set a Dynamic Activity using the Temporal .NET SDK**

A Dynamic Activity in Temporal is an Activity that is invoked dynamically at runtime if no other Activity with the same name is registered.
An Activity can be made dynamic by setting `Dynamic` as `true` on the `[Activity]` attribute.
You must register the Activity with the Worker before it can be invoked.
Only one Dynamic Activity can be present on a Worker.

The Activity Definition must then accept a single argument of type `Temporalio.Converters.IRawValue[]`.
The [PayloadConverter](https://dotnet.temporal.io/api/Temporalio.Activities.ActivityExecutionContext.html#Temporalio_Activities_ActivityExecutionContext_PayloadConverter) property on the `ActivityExecutionContext` is used to convert an `IRawValue` object to the desired type using extension methods in the `Temporalio.Converters` namespace.

```csharp
public class MyActivities
{
    [Activity(Dynamic = true)]
    public string DynamicActivity(IRawValue[] args)
    {
        var input = ActivityExecutionContext.Current.PayloadConverter.ToValue<MyActivityParams>(args.Single());
        return $"{input.Greeting}, {input.Name}!";
    }
}
```