diff --git a/TLSharp.Core/TLSharp.Core.csproj b/TLSharp.Core/TLSharp.Core.csproj
index eedca93..56e43b6 100644
--- a/TLSharp.Core/TLSharp.Core.csproj
+++ b/TLSharp.Core/TLSharp.Core.csproj
@@ -73,6 +73,8 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Network\Requests\AckRequest.cs" />
     <Compile Include="Network\Requests\PingRequest.cs" />
+    <Compile Include="Types\DataCenterIPVersions.cs" />
+    <Compile Include="Types\ParticipantTypes.cs" />
     <Compile Include="Utils\UploadHelper.cs" />
     <Compile Include="Session.cs" />
     <Compile Include="TelegramClient.cs" />
@@ -88,9 +90,7 @@
       <Name>TeleSharp.TL</Name>
     </ProjectReference>
   </ItemGroup>
-  <ItemGroup>
-    <Folder Include="Types\" />
-  </ItemGroup>
+  <ItemGroup />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
diff --git a/TLSharp.Core/TelegramClient.cs b/TLSharp.Core/TelegramClient.cs
index 6b3fde4..86c5f9a 100644
--- a/TLSharp.Core/TelegramClient.cs
+++ b/TLSharp.Core/TelegramClient.cs
@@ -18,13 +18,18 @@ using TLSharp.Core.Exceptions;
 using TLSharp.Core.MTProto.Crypto;
 using TLSharp.Core.Network;
 using TLSharp.Core.Network.Exceptions;
+using TLSharp.Core.Types;
 using TLSharp.Core.Utils;
 using TLAuthorization = TeleSharp.TL.Auth.TLAuthorization;
+using TLRequestUpdateUsername = TeleSharp.TL.Account.TLRequestUpdateUsername;
 
 namespace TLSharp.Core
 {
     public class TelegramClient : IDisposable
     {
+        /// <summary>
+        /// When pagination is needed, this is the default page size
+        /// </summary> 
         public const int DEFAULT_PAGE_SIZE = 200;
 
         private MtProtoSender sender;
@@ -265,7 +270,7 @@ namespace TLSharp.Core
 
         public async Task<bool> CheckUsernameAsync(string username, CancellationToken token = default(CancellationToken))
         {
-            var req = new TLRequestCheckUsername { Username = username };
+            var req = new TeleSharp.TL.Account.TLRequestCheckUsername { Username = username };
 
             return await SendAuthenticatedRequestAsync<bool>(req, token)
                 .ConfigureAwait(false);
diff --git a/TLSharp.Core/Types/ParticipantTypes.cs b/TLSharp.Core/Types/ParticipantTypes.cs
new file mode 100644
index 0000000..44be381
--- /dev/null
+++ b/TLSharp.Core/Types/ParticipantTypes.cs
@@ -0,0 +1,16 @@
+namespace TLSharp.Core.Types
+{
+    public enum ParticipantTypes
+    { 
+        Recents, 
+        Restricted,
+        Admins,
+        Bots,
+        Search,
+        Contacts,
+        Kicked,
+        Banned
+    }
+
+
+}