# Worker processes - .NET SDK

> Shows how to run Worker processes with the .NET SDK

## Run Worker Process

**How to create and run a Worker Process using the Temporal .NET SDK**

The [Worker Process](/workers#worker-process) is where Workflow Functions and Activity Functions are executed.

- Each [Worker Entity](/workers#worker-entity) in the Worker Process must register the exact Workflow Types and Activity Types it may execute.
- Each Worker Entity must also associate itself with exactly one [Task Queue](/task-queue).
- Each Worker Entity polling the same Task Queue must be registered with the same Workflow Types and Activity Types.

A [Worker Entity](/workers#worker-entity) is the component within a Worker Process that listens to a specific Task Queue.

Although multiple Worker Entities can be in a single Worker Process, a single Worker Entity Worker Process may be perfectly sufficient.
For more information, see the [Worker tuning guide](/develop/worker-performance).

A Worker Entity contains a Workflow Worker and/or an Activity Worker, which makes progress on Workflow Executions and Activity Executions, respectively.

To develop a Worker, create a new `Temporalio.Worker.TemporalWorker` providing the Client and worker options which include Task Queue, Workflows, and Activities and more.
The following code example creates a Worker that polls for tasks from the Task Queue and executes the Workflow.
When a Worker is created, it accepts a list of Workflows, a list of Activities, or both.

```csharp
// Create a client to localhost on default namespace
var client = await TemporalClient.ConnectAsync(new("localhost:7233")
{
    LoggerFactory = LoggerFactory.Create(builder =>
        builder.
            AddSimpleConsole(options => options.TimestampFormat = "[HH:mm:ss] ").
            SetMinimumLevel(LogLevel.Information)),
});

// Cancellation token cancelled on ctrl+c
using var tokenSource = new CancellationTokenSource();
Console.CancelKeyPress += (_, eventArgs) =>
{
    tokenSource.Cancel();
    eventArgs.Cancel = true;
};

// Create an activity instance with some state
var activities = new MyActivities();

// Run worker until cancelled
Console.WriteLine("Running worker");
using var worker = new TemporalWorker(
    client,
    new TemporalWorkerOptions(taskQueue: "my-task-queue").
        AddAllActivities(activities).
        AddWorkflow<MyWorkflow>());
try
{
    await worker.ExecuteAsync(tokenSource.Token);
}
catch (OperationCanceledException)
{
    Console.WriteLine("Worker cancelled");
}
```

All Workers listening to the same Task Queue name must be registered to handle the exact same Workflows Types and Activity Types.

If a Worker polls a Task for a Workflow Type or Activity Type it does not know about, it fails that Task.
However, the failure of the Task does not cause the associated Workflow Execution to fail.

### Worker Processes with host builder and dependency injection

The [Temporalio.Extensions.Hosting](https://github.com/temporalio/sdk-dotnet/tree/main/src/Temporalio.Extensions.Hosting) extension exists for .NET developers to support HostBuilder and Dependency Injection approaches.

To create the same worker as before using this approach:

```csharp
var host = Host.CreateDefaultBuilder(args)
    .ConfigureLogging(ctx => ctx.AddSimpleConsole().SetMinimumLevel(LogLevel.Information))
    .ConfigureServices(ctx =>
        ctx.
            // Add the database client at the scoped level
            AddScoped<IMyDatabaseClient, MyDatabaseClient>().
            // Add the worker
            AddHostedTemporalWorker(
                clientTargetHost: "localhost:7233",
                clientNamespace: "default",
                taskQueue: "my-task-queue").
            // Add the activities class at the scoped level
            AddScopedActivities<MyActivities>().
            AddWorkflow<MyWorkflow>())
    .Build();
await host.RunAsync();
```