diff --git a/src/Orchard.Web/Modules/Orchard.Comments/Annotations/CommentValidationAttributes.cs b/src/Orchard.Web/Modules/Orchard.Comments/Annotations/CommentValidationAttributes.cs
new file mode 100644
index 000000000..551afb931
--- /dev/null
+++ b/src/Orchard.Web/Modules/Orchard.Comments/Annotations/CommentValidationAttributes.cs
@@ -0,0 +1,39 @@
+using Orchard.Localization;
+
+namespace Orchard.Comments.Annotations {
+    public class RequiredAttribute : System.ComponentModel.DataAnnotations.RequiredAttribute {
+        public RequiredAttribute() {
+            T = NullLocalizer.Instance;
+        }
+
+        public Localizer T { get; set; }
+
+        public override string FormatErrorMessage(string name) {
+            return T("You must provide a {0} in order to comment.", name).Text;
+        }
+    }
+
+    public class CommentRequiredAttribute : System.ComponentModel.DataAnnotations.RequiredAttribute {
+        public CommentRequiredAttribute() {
+            T = NullLocalizer.Instance;
+        }
+
+        public Localizer T { get; set; }
+
+        public override string FormatErrorMessage(string name) {
+            return T("You must provide a Comment.", name).Text;
+        }
+    }
+
+    public class RegularExpressionAttribute : System.ComponentModel.DataAnnotations.RegularExpressionAttribute {
+        public RegularExpressionAttribute(string pattern) : base(pattern) {
+            T = NullLocalizer.Instance;
+        }
+
+        public Localizer T { get; set; }
+
+        public override string FormatErrorMessage(string name) {
+            return T("The {0} is not valid.", name).Text;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Orchard.Web/Modules/Orchard.Comments/Orchard.Comments.csproj b/src/Orchard.Web/Modules/Orchard.Comments/Orchard.Comments.csproj
index 5d05b1683..1e8557652 100644
--- a/src/Orchard.Web/Modules/Orchard.Comments/Orchard.Comments.csproj
+++ b/src/Orchard.Web/Modules/Orchard.Comments/Orchard.Comments.csproj
@@ -65,6 +65,7 @@
     <Compile Include="Drivers\CommentsContainerPartDriver.cs" />
     <Compile Include="Drivers\CommentSettingsPartDriver.cs" />
     <Compile Include="Drivers\CommentsPartDriver.cs" />
+    <Compile Include="Annotations\CommentValidationAttributes.cs" />
     <Compile Include="ResourceManifest.cs" />
     <Compile Include="Shapes.cs" />
     <Compile Include="Models\ClosedCommentsRecord.cs" />
diff --git a/src/Orchard.Web/Modules/Orchard.Comments/ViewModels/CommentsCreateViewModel.cs b/src/Orchard.Web/Modules/Orchard.Comments/ViewModels/CommentsCreateViewModel.cs
index db146acb7..51fb81d4c 100644
--- a/src/Orchard.Web/Modules/Orchard.Comments/ViewModels/CommentsCreateViewModel.cs
+++ b/src/Orchard.Web/Modules/Orchard.Comments/ViewModels/CommentsCreateViewModel.cs
@@ -1,22 +1,23 @@
 using System.ComponentModel.DataAnnotations;
+using Orchard.Comments.Annotations;
 
 namespace Orchard.Comments.ViewModels {
     public class CommentsCreateViewModel {
-        [Required(ErrorMessage="You must provide a Name in order to comment")]
+        [Annotations.Required]
         [StringLength(255)]
         public string Name { get; set; }
 
-        [RegularExpression(@"^[\w-]+@([\w-]+\.)+[\w]{2,4}$", ErrorMessage = "The Email is not valid")]
+        [Annotations.RegularExpression(@"^[\w-]+@([\w-]+\.)+[\w]{2,4}$")]
         [StringLength(255)]
         public string Email { get; set; }
 
         [StringLength(245)]
-        [RegularExpression(@"^(http(s)?://)?([\w-]+\.)+[\S]+$", ErrorMessage = "The Url is not valid")]
+        [Annotations.RegularExpression(@"^(http(s)?://)?([\w-]+\.)+[\S]+$")]
         public string SiteName { get; set; }
-        
-        [Required(ErrorMessage = "You must provide a Comment")]
+
+        [CommentRequired]
         public string CommentText { get; set; }
 
         public int CommentedOn { get; set; }
     }
-}
+}
\ No newline at end of file
diff --git a/src/Orchard.Web/Modules/Orchard.Setup/Annotations/SetupValidationAttributes.cs b/src/Orchard.Web/Modules/Orchard.Setup/Annotations/SetupValidationAttributes.cs
new file mode 100644
index 000000000..3f91ed9de
--- /dev/null
+++ b/src/Orchard.Web/Modules/Orchard.Setup/Annotations/SetupValidationAttributes.cs
@@ -0,0 +1,88 @@
+using Orchard.Localization;
+
+namespace Orchard.Setup.Annotations {
+    public class SiteNameValidAttribute : System.ComponentModel.DataAnnotations.RangeAttribute {
+        private string _value;
+
+        public SiteNameValidAttribute(int maximumLength)
+            : base(1, maximumLength) {
+            T = NullLocalizer.Instance;
+        }
+
+        public Localizer T { get; set; }
+
+        public override bool IsValid(object value) {
+            _value = (value as string) ?? "";
+            return base.IsValid(_value.Trim().Length);
+        }
+
+        public override string FormatErrorMessage(string name) {
+            if (string.IsNullOrWhiteSpace(_value))
+                return T("Site name is required.").Text;
+
+            return T("Site name can be no longer than {0} characters.", Maximum).Text;
+        }
+    }
+
+    public class UserNameValidAttribute : System.ComponentModel.DataAnnotations.RangeAttribute {
+        private string _value;
+
+        public UserNameValidAttribute(int minimumLength, int maximumLength)
+            : base(minimumLength, maximumLength) {
+            T = NullLocalizer.Instance;
+        }
+
+        public Localizer T { get; set; }
+
+        public override bool IsValid(object value) {
+            _value = (value as string) ?? "";
+            return base.IsValid(_value.Trim().Length);
+        }
+
+        public override string FormatErrorMessage(string name) {
+            if (string.IsNullOrEmpty(_value))
+                return T("User name is required.").Text;
+
+            return _value.Length < (int)Minimum
+                ? T("User name must be longer than {0} characters.", Minimum).Text
+                : T("User name can be no longer than {0} characters.", Maximum).Text;
+        }
+    }
+
+    public class PasswordValidAttribute : System.ComponentModel.DataAnnotations.RangeAttribute {
+        private string _value;
+
+        public PasswordValidAttribute(int minimumLength, int maximumLength)
+            : base(minimumLength, maximumLength) {
+            T = NullLocalizer.Instance;
+        }
+
+        public Localizer T { get; set; }
+
+        public override bool IsValid(object value) {
+            _value = (value as string) ?? "";
+            return base.IsValid(_value.Trim().Length);
+        }
+
+        public override string FormatErrorMessage(string name) {
+            if (string.IsNullOrEmpty(_value))
+                return T("Password is required.").Text;
+
+            return _value.Length < (int)Minimum
+                ? T("Password must be longer than {0} characters.", Minimum).Text
+                : T("Password can be no longer than {0} characters.", Maximum).Text;
+        }
+    }
+
+    public class PasswordConfirmationRequiredAttribute : System.ComponentModel.DataAnnotations.RequiredAttribute {
+        public PasswordConfirmationRequiredAttribute() {
+            T = NullLocalizer.Instance;
+        }
+
+        public Localizer T { get; set; }
+
+        public override string FormatErrorMessage(string name) {
+            return T("Password confirmation is required.").Text;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Orchard.Web/Modules/Orchard.Setup/Orchard.Setup.csproj b/src/Orchard.Web/Modules/Orchard.Setup/Orchard.Setup.csproj
index 9a3f09c68..12269923f 100644
--- a/src/Orchard.Web/Modules/Orchard.Setup/Orchard.Setup.csproj
+++ b/src/Orchard.Web/Modules/Orchard.Setup/Orchard.Setup.csproj
@@ -61,6 +61,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Annotations\SetupValidationAttributes.cs" />
     <Compile Include="Annotations\SqlDatabaseConnectionStringAttribute.cs" />
     <Compile Include="Annotations\StringLengthMin.cs" />
     <Compile Include="Commands\SetupCommand.cs" />
diff --git a/src/Orchard.Web/Modules/Orchard.Setup/ViewModels/SetupViewModel.cs b/src/Orchard.Web/Modules/Orchard.Setup/ViewModels/SetupViewModel.cs
index 44bd91ce8..6bd99e684 100644
--- a/src/Orchard.Web/Modules/Orchard.Setup/ViewModels/SetupViewModel.cs
+++ b/src/Orchard.Web/Modules/Orchard.Setup/ViewModels/SetupViewModel.cs
@@ -1,4 +1,3 @@
-using System.ComponentModel.DataAnnotations;
 using Orchard.Setup.Annotations;
 
 namespace Orchard.Setup.ViewModels {
@@ -7,13 +6,13 @@ namespace Orchard.Setup.ViewModels {
             DatabaseOptions = true;
         }
 
-        [Required(ErrorMessage = "Site name is required."), StringLength(70, ErrorMessage = "Site name can be no longer than 70 characters.")]
+        [SiteNameValid(maximumLength: 70)]
         public string SiteName { get; set; }
-        [Required(ErrorMessage = "User name is required."), StringLengthMin(3, ErrorMessage = "User name must be longer than 3 characters."), StringLength(25, ErrorMessage = "User name can be no longer than 25 characters.")]
+        [UserNameValid(minimumLength: 3, maximumLength: 25)]
         public string AdminUsername { get; set; }
-        [Required(ErrorMessage = "Password is required."), StringLengthMin(6, ErrorMessage = "Password must be longer than 6 characters."), StringLength(50, ErrorMessage = "Password can be no longer than 50 characters.")]
+        [PasswordValid(minimumLength: 6, maximumLength: 50)]
         public string AdminPassword { get; set; }
-        [Required(ErrorMessage = "Password confirmation is required.")]
+        [PasswordConfirmationRequired]
         public string ConfirmPassword { get; set; }
         public bool DatabaseOptions { get; set; }
         [SqlDatabaseConnectionString]