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Getting started

1. Install ConfigCat SDK Nuget package

Install-Package ConfigCat.Client

2. Import package

using ConfigCat.Client;

3. Create the ConfigCat client with your SDK Key

var client = ConfigCatClient.Get("#YOUR-SDK-KEY#");

4. Get your setting value

var isMyAwesomeFeatureEnabled = client.GetValue("isMyAwesomeFeatureEnabled", false);
if(isMyAwesomeFeatureEnabled)
{
doTheNewThing();
}
else
{
doTheOldThing();
}

5. Dispose the ConfigCat client

You can safely dispose all clients at once or individually and release all associated resources on application exit.

ConfigCatClient.DisposeAll(); // disposes all clients
// -or-
client.Dispose(); // disposes a specific client

Creating the ConfigCat Client

ConfigCat Client is responsible for:

  • managing the communication between your application and ConfigCat servers.
  • caching your setting values and feature flags.
  • serving values quickly in a failsafe way.

ConfigCatClient.Get(sdkKey: "<sdkKey>") returns a client with default options.

Customizing the ConfigCat Client

To customize the SDK's behavior, you can pass an additional Action<ConfigCatClientOptions> parameter to the Get() static factory method where the ConfigCatClientOptions class is used to set up the ConfigCat Client.

IConfigCatClient client = ConfigCatClient.Get("#YOUR-SDK-KEY#", options =>
{
options.PollingMode = PollingModes.ManualPoll;
options.Logger = new ConsoleLogger(LogLevel.Info);
});

These are the available options on the ConfigCatClientOptions class:

PropertiesDescriptionDefault
PollingModeOptional, sets the polling mode for the client. More about polling modes.PollingModes.AutoPoll()
ConfigCacheOptional, IConfigCatCache instance for caching the downloaded config.InMemoryConfigCache
LoggerOptional, IConfigCatLogger instance for tracing.ConsoleLogger (with WARNING level)
BaseUrlOptional, sets the CDN base url (forward proxy, dedicated subscription) from where the SDK will download the config JSON.
HttpClientHandlerOptional, HttpClientHandler to provide network credentials and proxy settings. More about the proxy settings.built-in HttpClientHandler
HttpTimeoutOptional, sets the underlying HTTP client's timeout. More about the HTTP timeout.TimeSpan.FromSeconds(30)
FlagOverridesOptional, sets the local feature flag & setting overrides. More about feature flag overrides.
DataGovernanceOptional, defaults to Global. Describes the location of your feature flag and setting data within the ConfigCat CDN. This parameter needs to be in sync with your Data Governance preferences. More about Data Governance. Available options: Global, EuOnlyGlobal
DefaultUserOptional, sets the default user. More about default user.null (none)
OfflineOptional, determines whether the client should be initialized to offline mode. More about offline mode.false

Via the events provided by ConfigCatClientOptions you can also subscribe to the hooks (events) at the time of initialization. More about hooks.

For example:

IConfigCatClient client = ConfigCatClient.Get("#YOUR-SDK-KEY#", options =>
{
options.ClientReady += (s, e) => Debug.WriteLine("Client is ready!");
});
info

You can acquire singleton client instances for your SDK keys using the ConfigCatClient.Get(sdkKey: "<sdkKey>") static factory method. (However, please keep in mind that subsequent calls to ConfigCatClient.Get() with the same SDK Key return a shared client instance, which was set up by the first call.)

You can close all open clients at once using the ConfigCatClient.DisposeAll() method or do it individually using the client.Dispose() method.

Anatomy of GetValue(), GetValueAsync()

ParametersDescription
keyREQUIRED. The key of a specific setting or feature flag. Set on ConfigCat Dashboard for each setting.
defaultValueREQUIRED. This value will be returned in case of an error.
userOptional, User Object. Essential when using Targeting. Read more about Targeting.
User userObject = new User("#UNIQUE-USER-IDENTIFIER#");  // Optional User Object
var value = client.GetValue("keyOfMyFeatureFlag", false, userObject);
User userObject = new User("#UNIQUE-USER-IDENTIFIER#"); // Optional User Object
var value = await client.GetValueAsync("keyOfMyFeatureFlag", false, userObject);
caution

It is important to provide an argument for the defaultValue parameter, specifically for the T generic type parameter, that matches the type of the feature flag or setting you are evaluating. Please refer to the following table for the corresponding types.

Setting KindType parameter T
On/Off Togglebool / bool?
Textstring / string?
Whole Numberint / int? / long / long?
Decimal Numberdouble / double?

In addition to the types mentioned above, you also have the option to provide object or object? for the type parameter regardless of the setting kind. However, this approach is not recommended as it may involve boxing.

It's important to note that providing any other type for the type parameter will result in an ArgumentException.

If you specify an allowed type but it mismatches the setting kind, an error message will be logged and defaultValue will be returned.

When relying on type inference and not explicitly specifying the type parameter, be mindful of potential type mismatch issues, especially with number types. For example, client.GetValue("keyOfMyDecimalSetting", 0) will return defaultValue (0) instead of the actual value of the decimal setting because the compiler infers the type as int instead of double, that is, the call is equivalent to client.GetValue<int>("keyOfMyDecimalSetting", 0), which is a type mismatch.

To correctly evaluate a decimal setting, you should use:

var value = client.GetValue("keyOfMyDecimalSetting", 0.0);
// -or-
var value = client.GetValue("keyOfMyDecimalSetting", 0d);
// -or-
var value = client.GetValue<double>("keyOfMyDecimalSetting", 0);

Anatomy of GetValueDetails(), GetValueDetailsAsync()

GetValueDetails()/GetValueDetailsAsync() are similar to GetValue()/GetValueAsync() but instead of returning the evaluated value only, they provide more detailed information about the evaluation result.

ParametersDescription
keyREQUIRED. The key of a specific setting or feature flag. Set on ConfigCat Dashboard for each setting.
defaultValueREQUIRED. This value will be returned in case of an error.
userOptional, User Object. Essential when using Targeting. Read more about Targeting.
User userObject = new User("#UNIQUE-USER-IDENTIFIER#"); // Optional User Object
var details = client.GetValueDetails("keyOfMyFeatureFlag", false, userObject);
User userObject = new User("#UNIQUE-USER-IDENTIFIER#"); // Optional User Object
var details = await client.GetValueDetailsAsync("keyOfMyFeatureFlag", false, userObject);
caution

It is important to provide an argument for the defaultValue parameter, specifically for the T generic type parameter, that matches the type of the feature flag or setting you are evaluating. Please refer to this table for the corresponding types.

The details result contains the following information:

FieldTypeDescription
KeystringThe key of the evaluated feature flag or setting.
Valuebool / string / int / doubleThe evaluated value of the feature flag or setting.
UserUserThe user object used for the evaluation.
IsDefaultValueboolTrue when the default value passed to GetValueDetails()/GetValueDetailsAsync() is returned due to an error.
ErrorMessagestringIn case of an error, this field contains the error message.
ErrorExceptionExceptionIn case of an error, this field contains the related exception object (if any).
MatchedEvaluationRuleRolloutRuleIf the evaluation was based on a targeting rule, this field contains that specific rule.
MatchedEvaluationPercentageRuleRolloutPercentageItemIf the evaluation was based on a percentage rule, this field contains that specific rule.
FetchTimeDateTimeThe last download time (UTC) of the current config.

User Object

The User Object is essential if you'd like to use ConfigCat's Targeting feature.

User userObject = new User("#UNIQUE-USER-IDENTIFIER#"); // Optional User Object
User userObject = new User("[email protected]");
ParametersDescription
IdREQUIRED. Unique identifier of a user in your application. Can be any string value, even an email address.
EmailOptional parameter for easier targeting rule definitions.
CountryOptional parameter for easier targeting rule definitions.
CustomOptional dictionary for custom attributes of a user for advanced targeting rule definitions. e.g. User role, Subscription type.
User userObject = new User("#UNIQUE-USER-IDENTIFIER#")
{
Email = "[email protected]",
Country = "United Kingdom",
Custom = new Dictionary<string, string> {
{"SubscriptionType", "Pro"},
{"UserRole", "Admin"}}
};

Default user

It's possible to set a default user object that will be used on feature flag and setting evaluation. It can be useful when your application has a single user only or rarely switches users.

You can set the default user object either on SDK initialization:

IConfigCatClient client = ConfigCatClient.Get("#YOUR-SDK-KEY#", options =>
options.DefaultUser = new User(identifier: "[email protected]"));

...or using the SetDefaultUser() method of the ConfigCatClient object:

client.SetDefaultUser(new User(identifier: "[email protected]"));

Whenever the evaluation methods like GetValue(), GetValueAsync(), etc. are called without an explicit user object parameter, the SDK will automatically use the default user as a user object.

var user = new User(identifier: "[email protected]");
client.SetDefaultUser(user);

// The default user will be used in the evaluation process.
var value = await client.GetValueAsync(key: "keyOfMyFeatureFlag", defaultValue: false);

When a user object parameter is passed to the evaluation methods, it takes precedence over the default user.

var user = new User(identifier: "[email protected]");
client.SetDefaultUser(user);

var otherUser = new User(identifier: "[email protected]");

// otherUser will be used in the evaluation process.
var value = await client.GetValueAsync(key: "keyOfMyFeatureFlag", defaultValue: false, user: otherUser);

You can also remove the default user by doing the following:

client.ClearDefaultUser();

Polling Modes

The ConfigCat SDK supports 3 different polling mechanisms to acquire the setting values from ConfigCat. After latest setting values are downloaded, they are stored in the local cache then all GetValue() calls are served from there. With the following polling modes, you can customize the SDK to best fit to your application's lifecycle.
More about polling modes.

Auto polling (default)

The ConfigCat SDK downloads and stores the latest values automatically every 60 seconds.

Use the pollInterval option parameter to change the polling interval.

IConfigCatClient client = ConfigCatClient.Get("#YOUR-SDK-KEY#", options =>
{
options.PollingMode = PollingModes.AutoPoll(pollInterval: TimeSpan.FromSeconds(95));
});

Available options:

Option ParameterDescriptionDefault
pollIntervalPolling interval.60s
maxInitWaitTimeMaximum waiting time between the client initialization and the first config acquisition.5s

Lazy loading

When calling GetValue() or GetValueAsync() the ConfigCat SDK downloads the latest setting values if they are not present or expired in the cache. In this case the GetValue()) or GetValueAsync() will return the setting value after the cache is updated.

Use cacheTimeToLive parameter to manage configuration lifetime.

IConfigCatClient client = ConfigCatClient.Get("#YOUR-SDK-KEY#", options =>
{
options.PollingMode = PollingModes.LazyLoad(cacheTimeToLive: TimeSpan.FromSeconds(600));
});

Available options:

Option ParameterDescriptionDefault
cacheTimeToLiveCache TTL.60s

Manual polling

Manual polling gives you full control over when the config JSON (with the setting values) is downloaded. ConfigCat SDK will not update them automatically. Calling ForceRefresh() is your application's responsibility.

IConfigCatClient client = ConfigCatClient.Get("#YOUR-SDK-KEY#", options =>
{
options.PollingMode = PollingModes.ManualPoll;
});

client.ForceRefresh();

GetValue() returns defaultValue if the cache is empty. Call ForceRefresh() to update the cache.

IConfigCatClient client = ConfigCatClient.Get("#YOUR-SDK-KEY#", options =>
{
options.PollingMode = PollingModes.ManualPoll;
});

Console.WriteLine(client.GetValue("keyOfMyTextSetting", "my default value")); // console: "my default value"
client.ForceRefresh();
Console.WriteLine(client.GetValue("keyOfMyTextSetting", "my default value")); // console: "value from server"

Hooks

The SDK provides several hooks (events), by means of which you can get notified of its actions. Via the following events you can subscribe to particular events raised by the client:

  • event EventHandler ClientReady: This event is raised when the SDK reaches the ready state. If the SDK is set up to use lazy load or manual polling, it's considered ready right after instantiation. If auto polling is used, the ready state is reached when the SDK has a valid config JSON loaded into memory either from cache or from HTTP. If the config couldn't be loaded neither from cache nor from HTTP, the ClientReady event fires when the auto polling's MaxInitWaitTime has passed.
  • event EventHandler<ConfigChangedEventArgs> ConfigChanged: This event is raised first when the SDK loads a valid config JSON into memory from cache, then each time afterwards when a config JSON with changed content is downloaded via HTTP.
  • event EventHandler<FlagEvaluatedEventArgs> FlagEvaluated: This event is raised each time when the SDK evaluates a feature flag or setting. The event provides the same evaluation details that you would get from GetValueDetails()/GetValueDetailsAsync().
  • event EventHandler<ConfigCatClientErrorEventArgs> Error: This event is raised when an error occurs within the ConfigCat SDK.

You can subscribe to these events either on initialization:

IConfigCatClient client = ConfigCatClient.Get("#YOUR-SDK-KEY#", options =>
{
options.PollingMode = PollingModes.ManualPoll;
options.FlagEvaluated += (s, e) => { /* handle the event */ };
});

...or directly on the ConfigCatClient instance:

client.FlagEvaluated += (s, e) => { /* handle the event */ };

Online / Offline mode

In cases where you want to prevent the SDK from making HTTP calls, you can switch it to offline mode:

client.SetOffline();

In offline mode, the SDK won't initiate HTTP requests and will work only from its cache.

To switch the SDK back to online mode, do the following:

client.SetOnline();

Using the client.IsOffline property you can check whether the SDK is in offline mode.

Flag Overrides

With flag overrides you can overwrite the feature flags & settings downloaded from the ConfigCat CDN with local values. Moreover, you can specify how the overrides should apply over the downloaded values. The following 3 behaviours are supported:

  • Local only (OverrideBehaviour.LocalOnly): When evaluating values, the SDK will not use feature flags & settings from the ConfigCat CDN, but it will use all feature flags & settings that are loaded from local-override sources.

  • Local over remote (OverrideBehaviour.LocalOverRemote): When evaluating values, the SDK will use all feature flags & settings that are downloaded from the ConfigCat CDN, plus all feature flags & settings that are loaded from local-override sources. If a feature flag or a setting is defined both in the downloaded and the local-override source then the local-override version will take precedence.

  • Remote over local (OverrideBehaviour.RemoteOverLocal): When evaluating values, the SDK will use all feature flags & settings that are downloaded from the ConfigCat CDN, plus all feature flags & settings that are loaded from local-override sources. If a feature flag or a setting is defined both in the downloaded and the local-override source then the downloaded version will take precedence.

You can load your feature flag & setting overrides from a file or from a simple Dictionary<string, object> structure.

JSON File

The SDK can load your feature flag & setting overrides from a file. You can also specify whether the file should be reloaded when it gets modified.

File

IConfigCatClient client = ConfigCatClient.Get("localhost", options =>
{
options.FlagOverrides = FlagOverrides.LocalFile(
"path/to/local_flags.json", // path to the file
true, // reload the file when it gets modified
OverrideBehaviour.LocalOnly
);
});

JSON File Structure

The SDK supports 2 types of JSON structures to describe feature flags & settings.

1. Simple (key-value) structure
{
"flags": {
"enabledFeature": true,
"disabledFeature": false,
"intSetting": 5,
"doubleSetting": 3.14,
"stringSetting": "test"
}
}

This is the same format that the SDK downloads from the ConfigCat CDN. It allows the usage of all features you can do on the ConfigCat Dashboard.

You can download your current config JSON from ConfigCat's CDN and use it as a baseline.

The URL to your current config JSON is based on your Data Governance settings:

  • GLOBAL: https://cdn-global.configcat.com/configuration-files/{YOUR-SDK-KEY}/config_v5.json
  • EU: https://cdn-eu.configcat.com/configuration-files/{YOUR-SDK-KEY}/config_v5.json
{
"f": {
// list of feature flags & settings
"isFeatureEnabled": {
// key of a particular flag
"v": false, // default value, served when no rules are defined
"i": "430bded3", // variation id (for analytical purposes)
"t": 0, // feature flag's type, possible values:
// 0 -> BOOLEAN
// 1 -> STRING
// 2 -> INT
// 3 -> DOUBLE
"p": [
// list of percentage rules
{
"o": 0, // rule's order
"v": true, // value served when the rule is selected during evaluation
"p": 10, // % value
"i": "bcfb84a7" // variation id (for analytical purposes)
},
{
"o": 1, // rule's order
"v": false, // value served when the rule is selected during evaluation
"p": 90, // % value
"i": "bddac6ae" // variation id (for analytical purposes)
}
],
"r": [
// list of targeting rules
{
"o": 0, // rule's order
"a": "Identifier", // comparison attribute
"t": 2, // comparator, possible values:
// 0 -> 'IS ONE OF',
// 1 -> 'IS NOT ONE OF',
// 2 -> 'CONTAINS',
// 3 -> 'DOES NOT CONTAIN',
// 4 -> 'IS ONE OF (SemVer)',
// 5 -> 'IS NOT ONE OF (SemVer)',
// 6 -> '< (SemVer)',
// 7 -> '<= (SemVer)',
// 8 -> '> (SemVer)',
// 9 -> '>= (SemVer)',
// 10 -> '= (Number)',
// 11 -> '<> (Number)',
// 12 -> '< (Number)',
// 13 -> '<= (Number)',
// 14 -> '> (Number)',
// 15 -> '>= (Number)',
// 16 -> 'IS ONE OF (Hashed)',
// 17 -> 'IS NOT ONE OF (Hashed)'
"c": "@example.com", // comparison value
"v": true, // value served when the rule is selected during evaluation
"i": "bcfb84a7" // variation id (for analytical purposes)
}
]
}
}
}

Dictionary

You can set up the SDK to load your feature flag & setting overrides from a Dictionary<string, object>.

var dictionary = new Dictionary<string, object>
{
{"enabledFeature", true},
{"disabledFeature", false},
{"intSetting", 5},
{"doubleSetting", 3.14},
{"stringSetting", "test"},
};

IConfigCatClient client = ConfigCatClient.Get("localhost", options =>
{
options.FlagOverrides = FlagOverrides.LocalDictionary(dictionary, OverrideBehaviour.LocalOnly);
});

Logging

Setting log level

IConfigCatClient client = ConfigCatClient.Get("#YOUR-SDK-KEY#");

client.LogLevel = LogLevel.Info;

Available log levels:

LevelDescription
OffNothing is logged.
ErrorOnly error level events are logged.
WarningDefault. Errors and Warnings are logged.
InfoErrors, Warnings and feature flag evaluation is logged.
DebugAll of the above plus debug info is logged.

Info level logging helps to inspect the feature flag evaluation process:

ConfigCat.INFO  [5000] Evaluating 'isPOCFeatureEnabled'
Applying the first targeting rule that matches the User '{"Identifier":"<SOME USERID>","Email":"[email protected]","Country":"US","Custom":{"SubscriptionType":"Pro","Role":"Admin","version":"1.0.0"}}':
- rule: [IF User.Email CONTAINS '@something.com' THEN False] => no match
- rule: [IF User.Email CONTAINS '@example.com' THEN True] => MATCH, applying rule
Returning 'True' (VariationId: '9f21c24c').

Sample code on how to create a basic file logger implementation for ConfigCat client: See Sample Code

Another sample which shows how to implement an adapter to the built-in logging framework of .NET Core/.NET 5+: See Sample Code

GetAllKeys(), GetAllKeysAsync()

You can get all the setting keys from your configuration by calling the GetAllKeys() or GetAllKeysAsync() method of the ConfigCatClient.

IConfigCatClient client = ConfigCatClient.Get("#YOUR-SDK-KEY#");
IEnumerable<string> keys = client.GetAllKeys();
IConfigCatClient client = ConfigCatClient.Get("#YOUR-SDK-KEY#");
IEnumerable<string> keys = await client.GetAllKeysAsync();

GetAllValues(), GetAllValuesAsync()

Evaluates and returns the values of all feature flags and settings. Passing a User Object is optional.

IConfigCatClient client = ConfigCatClient.Get("#YOUR-SDK-KEY#");
IDictionary<string, object> settingValues = client.GetAllValues();

// invoke with user object
User userObject = new User("#UNIQUE-USER-IDENTIFIER#");
IDictionary<string, object> settingValuesTargeting = client.GetAllValues(userObject);
IConfigCatClient client = ConfigCatClient.Get("#YOUR-SDK-KEY#");
IDictionary<string, object> settingValues = await client.GetAllValuesAsync();

// invoke with user object
User userObject = new User("#UNIQUE-USER-IDENTIFIER#");
IDictionary<string, object> settingValuesTargeting = await client.GetAllValuesAsync(userObject);

GetAllValueDetails(), GetAllValueDetailsAsync()

Evaluates and returns the values along with evaluation details of all feature flags and settings. Passing a User Object is optional.

IConfigCatClient client = ConfigCatClient.Get("#YOUR-SDK-KEY#");
IReadOnlyList<EvaluationDetails> settingValues = client.GetAllValueDetails();

// invoke with user object
User userObject = new User("435170f4-8a8b-4b67-a723-505ac7cdea92");
IReadOnlyList<EvaluationDetails> settingValuesTargeting = client.GetAllValueDetails(userObject);
IConfigCatClient client = ConfigCatClient.Get("#YOUR-SDK-KEY#");
IReadOnlyList<EvaluationDetails> settingValues = await client.GetAllValueDetailsAsync();

// invoke with user object
User userObject = new User("435170f4-8a8b-4b67-a723-505ac7cdea92");
IReadOnlyList<EvaluationDetails> settingValuesTargeting = await client.GetAllValueDetailsAsync(userObject);

Using custom cache implementation

The ConfigCat SDK stores the downloaded config data in a local cache to minimize network traffic and enhance client performance. If you prefer to use your own cache solution, such as an external or distributed cache in your system, you can implement the IConfigCatCache interface and set the ConfigCache parameter in the setup callback of ConfigCatClient.Get. This allows you to seamlessly integrate ConfigCat with your existing caching infrastructure.

public class MyCustomCache : IConfigCatCache
{
public string? Get(string key)
{
/* insert your synchronous cache read logic here */
}

public Task<string?> GetAsync(string key, CancellationToken cancellationToken = default)
{
/* insert your asynchronous cache read logic here */
}

public void Set(string key, string value)
{
/* insert your synchronous cache write logic here */
}

public Task SetAsync(string key, string value, CancellationToken cancellationToken = default)
{
/* insert your asynchronous cache write logic here */
}
}

then

IConfigCatClient client = ConfigCatClient.Get("#YOUR-SDK-KEY#", options =>
{
options.ConfigCache = new MyCustomCache()
});
info

The .NET SDK supports shared caching. You can read more about this feature and the required minimum SDK versions here.

Using ConfigCat behind a proxy

Provide your own network credentials (username/password) and proxy server settings (proxy server/port) by setting the HttpClientHandler property in the setup callback of ConfigCatClient.Get.

var myProxySettings = new WebProxy(proxyHost, proxyPort)
{
UseDefaultCredentials = false,
Credentials = new NetworkCredential(proxyUserName, proxyPassword)
};

var myHttpClientHandler = new HttpClientHandler { Proxy = myProxySettings };

IConfigCatClient client = ConfigCatClient.Get("#YOUR-SDK-KEY#", options =>
{
options.HttpClientHandler = myHttpClientHandler;
});

HTTP Timeout

You can set the maximum wait time for a ConfigCat HTTP response.

IConfigCatClient client = ConfigCatClient.Get("#YOUR-SDK-KEY#", options =>
{
options.HttpTimeout = TimeSpan.FromSeconds(10);
});

The default timeout is 30 seconds.

Troubleshooting

When the ConfigCat SDK does not work as expected in your application, please check for the following potential problems:

  • Symptom: Instead of the actual value, the default one is constantly returned by GetValue()/GetValueAsync() and the log contains the following message (provided that the client is set up to log error level events as described here): "Secure connection could not be established. Please make sure that your application is enabled to use TLS 1.2+."

    Problem: ConfigCat CDN servers require TLS 1.2 or newer security protocol for communication. As for allowed security protocols, please keep in mind that newer .NET runtimes rely on operating system settings, older versions, however, may need additional setup to make secure communication with the CDN servers work.

    Runtime VersionDefault Protocols
    .NET Framework 4.5 and earlierSSL 3.0, TLS 1.0
    .NET Framework 4.6TLS 1.0, 1.1, 1.2, 1.3
    .NET Framework 4.7+, .NET Core 1.0+, .NET 5+System (OS) Defaults

    As shown in the table above, if your application runs on .NET Framework 4.5, by default it will fail to establish a connection to the CDN servers. Read this for more details.

    Solution: The best solution to the problem is to upgrade your application to target a newer runtime but in case that is not possible, you can use the following workaround:

    ServicePointManager.SecurityProtocol |= SecurityProtocolType.Tls12;

    (Place this code at the startup of your application, before any instances of ConfigCatClient is created.)

Sample Applications

Check out our Sample Applications how they use the ConfigCat SDK:

Guides

See the following guides on how to use ConfigCat's .NET SDK:

Look under the hood