diff --git a/Extensions/XModelExtensions.cs b/Extensions/XModelExtensions.cs
index 502b34d..5d55da1 100644
--- a/Extensions/XModelExtensions.cs
+++ b/Extensions/XModelExtensions.cs
@@ -1,49 +1,84 @@
 using System;
+using xModels.Dtos;
 using xCommons.Extensions;
+using xIdentityModels.Dtos;
 using xIdentityModels.Models;
 using System.Collections.Generic;
 using xIdentityModels.Descriptors;
 using xIdentityModels.Navigations;
 
-namespace xIdentityModels.Extensions {
-    public static class XModelExtensions {
+namespace xIdentityModels.Extensions
+{
+    public static class XModelExtensions
+    {
         /// <summary>
         /// /// Convert XIdentityUserDescriptor instance to XUser
         /// </summary>
         /// <param name="source"></param>
         /// <returns></returns>
-        public static XUser ToXUser (this XIdentityUserDescriptor source) {
-            return new XUser {
+        public static XUser ToXUser(this XIdentityUserDescriptor source)
+        {
+            return new XUser
+            {
                 Id = source.Id,
-                    FirstName = source.FirstName,
-                    LastName = source.LastName,
-                    UserName = source.UserName,
-                    Email = source.Email,
-                    EmailConfirmed = source.EmailConfirmed,
-                    PhoneNumber = source.PhoneNumber,
-                    PhoneNumberConfirmed = source.PhoneNumberConfirmed,
-                    IsEnable = true,
-                    IsBanned = false,
-                    CreationDate = DateTime.UtcNow,
-                    DateOfBirth = DateTime.Parse (source.DateOfBirth)
+                FirstName = source.FirstName,
+                LastName = source.LastName,
+                UserName = source.UserName,
+                Email = source.Email,
+                EmailConfirmed = source.EmailConfirmed,
+                PhoneNumber = source.PhoneNumber,
+                PhoneNumberConfirmed = source.PhoneNumberConfirmed,
+                IsEnable = true,
+                IsBanned = false,
+                CreationDate = DateTime.UtcNow,
+                DateOfBirth = DateTime.Parse(source.DateOfBirth)
             };
         }
 
+        /// <summary>
+        /// Converts a User to Person ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static XPersonDto ToXPerson(this XUser source)
+        {
+            //
+            XPersonDto result = null;
+
+            //
+            if (!source.IsNullOrDefault())
+            {
+                //
+                result = new XPersonDto
+                {
+                    Avatar = source.Avatar,
+                    Username = source.UserName,
+                    Lastname = source.LastName,
+                    Firstname = source.FirstName,
+                };
+            }
+
+            //
+            return result;
+        }
+
         /// <summary>
         /// Check a User is Same as Descriptor User
         /// </summary>
         /// <param name="source"></param>
         /// <param name="dest"></param>
         /// <returns></returns>
-        public static bool IsSameAs (this XUser source, XIdentityUserDescriptor dest) {
+        public static bool IsSameAs(this XUser source, XIdentityUserDescriptor dest)
+        {
             //
-            if (source.IsNull () ||
-                dest.IsNull ()) {
+            if (source.IsNull() ||
+                dest.IsNull())
+            {
                 return false;
             }
 
             //
-            var isSame = source.IsSameContent (dest, propertyWhiteList : new [] {
+            var isSame = source.IsSameContent(dest, propertyWhiteList: new[] {
                     nameof (XIdentityUserDescriptor.FirstName),
                     nameof (XIdentityUserDescriptor.LastName),
                     nameof (XIdentityUserDescriptor.UserName),
@@ -55,7 +90,7 @@ namespace xIdentityModels.Extensions {
                     nameof (XIdentityUserDescriptor.IsBanned),
                     nameof (XIdentityUserDescriptor.DateOfBirth)
                 },
-                propertyValueCheckers : new [] {
+                propertyValueCheckers: new[] {
                     new KeyValuePair<string, Func<XUser, XIdentityUserDescriptor, bool>> (
                         nameof (XIdentityUserDescriptor.DateOfBirth),
                         (user, descriptorUser) => {
@@ -76,18 +111,20 @@ namespace xIdentityModels.Extensions {
         /// <param name="source"></param>
         /// <param name="dest"></param>
         /// <returns></returns>
-        public static bool IsSameAs (this XDevice source, XDevice dest) {
+        public static bool IsSameAs(this XDevice source, XDevice dest)
+        {
             //
-            if (source.IsNull () ||
-                dest.IsNull ()) {
+            if (source.IsNull() ||
+                dest.IsNull())
+            {
                 return false;
             }
 
             //
-            var isSame = source.Os.ToNormalString () == dest.Os.ToNormalString () &&
-                source.OsVersion.ToNormalString () == dest.OsVersion.ToNormalString () &&
-                source.Browser.ToNormalString () == dest.Browser.ToNormalString () &&
-                source.UserAgent.ToNormalString () == dest.UserAgent.ToNormalString () &&
+            var isSame = source.Os.ToNormalString() == dest.Os.ToNormalString() &&
+                source.OsVersion.ToNormalString() == dest.OsVersion.ToNormalString() &&
+                source.Browser.ToNormalString() == dest.Browser.ToNormalString() &&
+                source.UserAgent.ToNormalString() == dest.UserAgent.ToNormalString() &&
                 source.DeviceType == dest.DeviceType;
 
             //
@@ -99,15 +136,18 @@ namespace xIdentityModels.Extensions {
         /// </summary>
         /// <param name="source"></param>
         /// <returns></returns>
-        public static XTokenResponse ToXTokenResponse (this XUserClaimsInfoDto source) {
+        public static XTokenResponse ToXTokenResponse(this XUserClaimsInfoDto source)
+        {
             //
-            if (source.IsNull () ||
-                (source.AccessToken.IsNullOrEmpty () && source.RefreshToken.IsNullOrEmpty ())) {
+            if (source.IsNull() ||
+                (source.AccessToken.IsNullOrEmpty() && source.RefreshToken.IsNullOrEmpty()))
+            {
                 return null;
             }
 
             //
-            var result = new XTokenResponse {
+            var result = new XTokenResponse
+            {
                 AccessToken = source.AccessToken,
                 RefreshToken = source.RefreshToken,
                 ExpiresAt = source.ExpiresAt
@@ -116,5 +156,109 @@ namespace xIdentityModels.Extensions {
             //
             return result;
         }
+
+        /// <summary>
+        /// Validate Item for Add or Update ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static bool IsValidForAdd(this XApplication source)
+        {
+            //
+            var result =
+                !source.IsNullOrDefault() &&
+                !source.Name.IsNullOrEmpty();
+
+            //
+            return result;
+        }
+
+        /// <summary>
+        /// Validate Item for Add or Update ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static bool IsValidForAdd(this XApplicationDto source)
+        {
+            //
+            var result =
+                !source.IsNullOrDefault() &&
+                !source.Name.IsNullOrEmpty();
+
+            //
+            return result;
+        }
+
+        /// <summary>
+        /// Validate Item for Add or Update ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static bool IsValidForAdd(this XApiKey source)
+        {
+            //
+            var result =
+                !source.IsNullOrDefault() &&
+                !source.ApplicationId.IsValidIntId() &&
+                !source.KeyHash.IsNullOrEmpty();
+
+            //
+            return result;
+        }
+
+        /// <summary>
+        /// Validate Item for Add or Update ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static bool IsValidForAdd(this XApiKeyDto source)
+        {
+            //
+            var result =
+                !source.IsNullOrDefault() &&
+                !source.ApplicationId.IsValidIntId() &&
+                !source.KeyHash.IsNullOrEmpty();
+
+            //
+            return result;
+        }
+
+        /// <summary>
+        /// Validate Item for Add or Update ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static bool IsValidForAdd(this XApiKeyUsage source)
+        {
+            //
+            var result =
+                !source.IsNullOrDefault() &&
+                !source.ApiKeyId.IsDefaultGuid() &&
+                !source.ClientIP.IsNullOrEmpty() &&
+                !source.Endpoint.IsNullOrEmpty() &&
+                !source.HttpMethod.IsNullOrEmpty();
+
+            //
+            return result;
+        }
+
+        /// <summary>
+        /// Validate Item for Add or Update ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static bool IsValidForAdd(this XApiKeyUsageDto source)
+        {
+            //
+            var result =
+                !source.IsNullOrDefault() &&
+                !source.ApiKeyId.IsDefaultGuid() &&
+                !source.ClientIP.IsNullOrEmpty() &&
+                !source.Endpoint.IsNullOrEmpty() &&
+                !source.HttpMethod.IsNullOrEmpty();
+
+            //
+            return result;
+        }
     }
 }
\ No newline at end of file
diff --git a/Extensions/xIdentityModelsExtensions.cs b/Extensions/xIdentityModelsExtensions.cs
index 4efbc11..949ca55 100644
--- a/Extensions/xIdentityModelsExtensions.cs
+++ b/Extensions/xIdentityModelsExtensions.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Linq;
 using xCommons.Extensions;
 using xIdentityModels.Dtos;
@@ -5,8 +6,6 @@ using xIdentityModels.Models;
 using xIdentityModels.Constants;
 using System.Collections.Generic;
 using xIdentityModels.Configurations;
-using Microsoft.OpenApi.Expressions;
-using System;
 
 namespace xIdentityModels.Extensions
 {