diff --git a/DI/XDIHelperExtension.cs b/DI/XDIHelperExtension.cs
index 18c5b72..669b275 100644
--- a/DI/XDIHelperExtension.cs
+++ b/DI/XDIHelperExtension.cs
@@ -3,8 +3,7 @@ using System.Linq;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
-using xCategoryService.Interfaces;
-using xCategoryService.Providers;
+using xCategoryService.DI;
 using xCommons.Extensions;
 using xDataService.DI;
 using xDataService.Models;
@@ -208,6 +207,11 @@ namespace xServices.DI
             app.UseXFileService(
                 isDevelopmentEnvironment: isDevelopmentEnvironment
             );
+            //
+            // Using Category Service ...
+            app.UseXCategoryService(
+                isDevelopmentEnvironment: isDevelopmentEnvironment
+            );
         }
 
         //
@@ -295,11 +299,14 @@ namespace xServices.DI
             services.AddScoped<IXTestRepositoryProvider, XTestRepositoryProvider>();
             #endregion
 
+            //
+            var repositoryType = xDataService.Constants.XRepositoryType.EF;
+
             //
             // Register String Service ...
             services.AddXStringService<XApiDbContext>(
                 lifeTime: lifeTime,
-                repositoryType: xDataService.Constants.XRepositoryType.EF
+                repositoryType: repositoryType
             );
 
             //
@@ -313,19 +320,22 @@ namespace xServices.DI
             // Register Tag Service ...
             services.AddXTagService<XApiDbContext>(
                 lifeTime: lifeTime,
-                repositoryType: xDataService.Constants.XRepositoryType.EF
+                repositoryType: repositoryType
             );
 
             //
             // Register File Service ...
             services.AddXFileService<XApiDbContext>(
                 lifeTime: lifeTime,
-                repositoryType: xDataService.Constants.XRepositoryType.EF
+                repositoryType: repositoryType
             );
 
             //
-            // TODO: Remove this ...
-            services.AddScoped<IXSubCategoryTitleResourceProvider, XSubCategoryTitleResourceProvider>();
+            // Register Category Service ...
+            services.AddXCategoryService<XApiDbContext>(
+                lifeTime: lifeTime,
+                repositoryType: repositoryType
+            );
         }
         #endregion        
     }