# Set up your local with the .NET SDK

> Configure your local development environment to get started developing with Temporal

# Quickstart

Configure your local development environment to get started developing with Temporal.

## Install .NET

    The .NET SDK requires .NET 6.0 or later.
    Install the latest version of .NET by following the [official .NET instructions](https://dotnet.microsoft.com/download).

## Install the Temporal .NET SDK

    Create a solution and the three projects used in this guide: `Workflow` (class library), `Worker` (console), and `Client` (console). Add them to the solution.

    Tip: You can also centralize the `Temporalio` package for all projects using `Directory.Packages.props` and `Directory.Build.props` at the solution root.

```bash
{`# Create solution and projects
mkdir TemporalioHelloWorld
cd TemporalioHelloWorld

dotnet new sln -n TemporalioHelloWorld

dotnet new classlib -o Workflow
dotnet new console -o Worker
dotnet new console -o Client

# Add projects to the solution
dotnet sln TemporalioHelloWorld.sln add Workflow/Workflow.csproj Worker/Worker.csproj Client/Client.csproj

# Add project references
dotnet add Worker/Worker.csproj reference Workflow/Workflow.csproj
dotnet add Client/Client.csproj reference Workflow/Workflow.csproj

# Install Temporal SDK in each project
dotnet add Workflow/Workflow.csproj package Temporalio
dotnet add Worker/Worker.csproj package Temporalio
dotnet add Client/Client.csproj package Temporalio`
}
```

```bash
{`dotnet build`}
```

## Install Temporal CLI and start the development server

    The fastest way to get a development version of the Temporal Service running on your local machine is to use [Temporal CLI](https://docs.temporal.io/cli).

    Choose your operating system to install Temporal CLI:

```bash
{`brew install temporal`}
```

```bash
{`sudo mv temporal /usr/local/bin`}
```

## Start the development server

    Once you've installed Temporal CLI and added it to your PATH, open a new Terminal window and run the following command.

    This command starts a local Temporal Service. It starts the Web UI, creates the default Namespace, and uses an in-memory database.

    The Temporal Service will be available on localhost:7233.
    The Temporal Web UI will be available at http://localhost:8233.

    Leave the local Temporal Service running as you work through tutorials and other projects. You can stop the Temporal Service at any time by pressing CTRL+C.

    Once you have everything installed, you're ready to build apps with Temporal on your local machine.

```bash
{`temporal server start-dev`}
```

```bash
{`temporal server start-dev --ui-port 8080`}
```

## Run Hello World: Test Your Installation

Now let's verify your setup is working by creating and running a complete Temporal application with both a Workflow and Activity.

This test will confirm that:

- Your .NET SDK installation is working
- Your local Temporal Service is running
- You can successfully create and execute Workflows and Activities
- The communication between components is functioning correctly

#### Tip: Example Directory Structure

```text
TemporalioHelloWorld/
├── Client/
│   ├── Client.csproj
│   └── Program.cs              # Starts a workflow
├── Worker/
│   ├── Worker.csproj
│   └── Program.cs              # Runs a worker
├── Workflow/
│   ├── Workflow.csproj
│   ├── MyActivities.cs         # Activity definition
│   └── SayHelloWorkflow.cs     # Workflow definition
└── TemporalioHelloWorld.sln
```

### 1. Create the Activity and Workflow 

#### Create an Activity file (MyActivities.cs) in the Workflow project:

```csharp
namespace MyNamespace;

using Temporalio.Activities;

public class MyActivities
{
    // Activities can be async and/or static too! We just demonstrate instance
    // methods since many will use them that way.
    [Activity]
    public string SayHello(string name) => $"Hello, {name}!";
}
```

An Activity is a normal function or method that executes a single, well-defined action (either short or long running), which often involve interacting with the outside world, such as sending emails, making network requests, writing to a database, or calling an API, which are prone to failure.
If an Activity fails, Temporal automatically retries it based on your configuration.

#### Create a Workflow file (SayHelloWorkflow.cs) in the Workflow project: 

```csharp
namespace MyNamespace;

using Temporalio.Workflows;

[Workflow]
public class SayHelloWorkflow
{
    [WorkflowRun]
    public async Task<string> RunAsync(string name)
    {
        // This workflow just runs a simple activity to completion.
        // StartActivityAsync could be used to just start and there are many
        // other things that you can do inside a workflow.
        return await Workflow.ExecuteActivityAsync(
            // This is a lambda expression where the instance is typed. If this
            // were static, you wouldn't need a parameter.
            (MyActivities act) => act.SayHello(name),
            new() { StartToCloseTimeout = TimeSpan.FromMinutes(5) }
        );
    }
}
```

Workflows orchestrate Activities and contain the application logic.
Temporal Workflows are resilient.
They can run and keep running for years, even if the underlying infrastructure fails.
If the application itself crashes, Temporal will automatically recreate its pre-failure state so it can continue right where it left off.

### 2. Create the Worker 

With your Activity and Workflow defined, you need a Worker to execute them.

#### Create a Worker file (Program.cs) in the Worker project:

```csharp
using MyNamespace;
using Temporalio.Client;
using Temporalio.Worker;

// Create a client to localhost on "default" namespace
var client = await TemporalClient.ConnectAsync(new("localhost:7233"));

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

// Create an activity instance since we have instance activities. If we had
// all static activities, we could just reference those directly.
var activities = new MyActivities();

// Create worker with the activity and workflow registered
using var worker = new TemporalWorker(
    client,
    new TemporalWorkerOptions("my-task-queue")
        .AddActivity(activities.SayHello)
        .AddWorkflow<SayHelloWorkflow>()
);

// Run worker until cancelled
Console.WriteLine("Running worker");
try
{
    await worker.ExecuteAsync(tokenSource.Token);
}
catch (OperationCanceledException)
{
    Console.WriteLine("Worker cancelled");
}
```

Run the Worker:

```bash
dotnet run --project Worker/Worker.csproj
```
Keep this terminal running - you should see `Running worker` displayed.

A Worker polls a Task Queue, that you configure it to poll, looking for work to do. 
Once the Worker dequeues the Workflow or Activity task from the Task Queue, it then executes that task.

Workers are a crucial part of your Temporal application as they're what actually execute the tasks defined in your Workflows and Activities.
For more information on Workers, see [Understanding Temporal](/evaluate/understanding-temporal#workers) and a [deep dive into Workers](/workers).

### 3. Execute the Workflow 

Now that your Worker is running, it's time to start a Workflow Execution.
This final step will validate that everything is working correctly. 

#### Create a Client file (Program.cs) in the Client project: 

```csharp
using MyNamespace;
using Temporalio.Client;

// Create a client to localhost on "default" namespace
var client = await TemporalClient.ConnectAsync(new("localhost:7233"));

// Run workflow
var result = await client.ExecuteWorkflowAsync(
    (SayHelloWorkflow wf) => wf.RunAsync("Temporal"),
    new(id: $"my-workflow-id-{Guid.NewGuid()}", taskQueue: "my-task-queue")
);

Console.WriteLine("Workflow result: {0}", result);
```

While the Worker is still running, run the Workflow:

```bash
dotnet run --project Client/Client.csproj
```

### Verify Success

If everything is working correctly, you should see:

- Worker processing the workflow and activity
- Output: `Workflow result: Hello Temporal`
- Workflow Execution details in the [Temporal Web UI](http://localhost:8233)

- [Run your first Temporal Application](https://learn.temporal.io/getting_started/dotnet/first_program_in_dotnet/): Create a basic Workflow and run it with the Temporal .NET SDK

- [Take a Temporal 101 course](https://learn.temporal.io/courses/): Learn Temporal concepts and build your first application with a guided course