CRD BotData

AnyDialog.cs

//In your dialog
Activity message = result as Activity;

//Create scope with respect to activity
using (var scope = DialogModule.BeginLifetimeScope(Conversation.Container, message))
{
  //Resolve scope for IBotDataStore<BotData>
  IBotDataStore<BotData> stateStore = scope.Resolve<IBotDataStore<BotData>>();	

  /* Retrieve user address. Address key holds information about Bot, Channel, User and conversation */ 
  Address key = Address.FromActivity(message);
  
  //Load user data with the help of key
  BotData userData = await stateStore.LoadAsync(key, BotStoreType.BotUserData, CancellationToken.None);
  
  //Get value by key
  string getUserLanguagePreference = userData.GetProperty<string>("language_preference");

  //Set value of type string
  userData.SetProperty<string>("language_preference", "en_US");

  //Remove value
  userData.RemoveProperty("language_preference");
}