Set up .NET (server-side) SDK

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Install-Package LaunchDarkly.ServerSdk

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using LaunchDarkly.Sdk;
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using LaunchDarkly.Sdk.Server;
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var builder = WebApplication.CreateBuilder(args);
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// Set your LaunchDarkly SDK key.
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// This is inlined as example only for onboarding.
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// Never hardcode your SDK key in production.
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var ldConfig = Configuration.Default("YOUR_SDK_KEY");
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var client = new LdClient(ldConfig);
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if (client.Initialized)
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{
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    // For onboarding purposes only we flush events as soon as
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    // possible so we quickly detect your connection.
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    // You don't have to do this in practice because events are automatically flushed.
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    client.Flush();
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    Console.WriteLine("*** SDK successfully initialized!\n");
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}
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else
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{
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    Console.WriteLine("*** SDK failed to initialize\n");
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    Environment.Exit(1);
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}