Delete O365 group with associated site collection via Graph SDK

In order to delete O365 group (Azure AD group + Sharepoint Online site collection) via .Net Graph SDK the following code may be used:

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public static bool DeleteGroup(string groupId) {     try     {         if (string.IsNullOrEmpty(groupId))         {             return false;         }           var graphClientApp = new GraphServiceClient(new AzureAuthenticationProviderAppPermissions());         if (graphClientApp == null)         {             return false;         }           graphClientApp.Groups[groupId].Request().DeleteAsync().GetAwaiter().GetResult();           return true;     }     catch (Exception x)     {         return false;     } }   public class AzureAuthenticationProviderAppPermissions : IAuthenticationProvider {     // implement own authentication logic for app permissions }

Azure AD group will be deleted immediately while associated site collection will be deleted with some delay (usually few minutes).