> ## Documentation Index
> Fetch the complete documentation index at: https://resend.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.
# Send emails with .NET
> Learn how to send your first email using the Resend .NET SDK.
export const YouTube = ({id}) => {
return ;
};
## Prerequisites
Before you start, you'll need:
* A Resend [API key](/create-an-api-key)
* A [verified domain](/add-a-domain)
Prefer watching a video? Check out our video walkthrough below.
## Guide
```bash dotnet CLI theme={"theme":{"light":"github-light","dark":"vesper"}}
dotnet add package Resend
```
```bash Visual Studio (Package Manager Console) theme={"theme":{"light":"github-light","dark":"vesper"}}
PM> Install-Package Resend
```
In the startup of your application, configure the DI container as follows:
```csharp theme={"theme":{"light":"github-light","dark":"vesper"}}
using Resend;
builder.Services.AddOptions();
builder.Services.AddHttpClient();
builder.Services.Configure( o =>
{
o.ApiToken = Environment.GetEnvironmentVariable( "RESEND_APITOKEN" )!;
} );
builder.Services.AddTransient();
```
Send an email using the injected `IResend` instance:
```csharp theme={"theme":{"light":"github-light","dark":"vesper"}}
using Resend;
public class FeatureImplementation
{
private readonly IResend _resend;
public FeatureImplementation( IResend resend )
{
_resend = resend;
}
public Task Execute()
{
var message = new EmailMessage();
message.From = "Acme ";
message.To.Add( "delivered@resend.dev" );
message.Subject = "hello world";
message.HtmlBody = "it works!";
await _resend.EmailSendAsync( message );
}
}
```
## Examples
Basic email sending
Send emails with file attachments
Send emails using Resend hosted templates
Schedule emails for future delivery
Manage contacts and audiences
Create and manage sending domains
Receive and process inbound emails
Double opt-in subscription flow
ASP.NET Minimal API application
ASP.NET MVC application