---
title:  Authentication
---

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A client is authenticated when it connects with valid credentials to a <%=vars.product_name%> cache server that is configured with the client authentication callback.
For details on the server's role in authentication and what it expects from the client, see [Implementing Authentication](geodeman/managing/security/implementing_authentication.html) in the *<%=vars.product_name%> User Guide*.

In your application, authentication credentials must be set when creating the cache. In practice,
this means setting the authentication credentials when you create the CacheFactory.

### .NET Authentication Example

The following excerpt is taken from the .NET example provided with your Native Client distribution in the `../examples/dotnet/authinitialize` directory.

In this C# authentication example, the `CacheFactory` creation process sets the authentication callback:

```cs
  var cacheFactory = new CacheFactory()
    .Set("log-level", "none")
    .SetAuthInitialize(new ExampleAuthInitialize());
```

Credentials are implemented in the `GetCredentials` member function of the `ExampleAuthInitialize` class, which implements the `IAuthInitialize` interface:

```cs
  class ExampleAuthInitialize : IAuthInitialize
  {
    public ExampleAuthInitialize()
    {
      // TODO initialize your resources here
      Console.Out.WriteLine("ExampleAuthInitialize::ExampleAuthInitialize called");
    }

    public void Close()
    {
      // TODO close your resources here
      Console.Out.WriteLine("ExampleAuthInitialize::Close called");
    }

    public Properties<string, object> GetCredentials(Properties<string, string> props, string server)
    {
      // TODO get your username and password
      Console.Out.WriteLine("ExampleAuthInitialize::GetCredentials called");

      var credentials = new Properties<string, object>();
      credentials.Insert("security-username", "root");
      credentials.Insert("security-password", "root");
      return credentials;
    }
  }

```