Set up .NET (server-side) SDK

Install and initialize the LaunchDarkly .NET (server-side) SDK

Install the package

Install-Package LaunchDarkly.ServerSdk

Initialize the SDK

using LaunchDarkly.Sdk;
using LaunchDarkly.Sdk.Server;

var builder = WebApplication.CreateBuilder(args);

// Set your LaunchDarkly SDK key.
// This is inlined as example only for onboarding.
// Never hardcode your SDK key in production.
var ldConfig = Configuration.Default("YOUR_SDK_KEY");
var client = new LdClient(ldConfig);

if (client.Initialized)
{
    // For onboarding purposes only we flush events as soon as
    // possible so we quickly detect your connection.
    // You don't have to do this in practice because events are automatically flushed.
    client.Flush();
    Console.WriteLine("*** SDK successfully initialized!\n");
}
else
{
    Console.WriteLine("*** SDK failed to initialize\n");
    Environment.Exit(1);
}

Finding your SDK credentials

You can find your server-side SDK key, client-side ID, and mobile key in the “Resources” section of the help menu. Click the help icon at the bottom left corner of the LaunchDarkly UI, then choose SDK keys:

To learn more, read Initialize the client in the .NET (server-side) SDK reference guide.