Fixes 28344

[TFS Changeset #75950]

umbraco/cms/businesslogic/ContentType.cs

@@ -350,6 +350,13 @@ namespace umbraco.cms.businesslogic
             set
             {
                 _alias = helpers.Casing.SafeAliasWithForcingCheck(value);
+                
+                // validate if alias is empty
+                if (String.IsNullOrEmpty(_alias))
+                {
+                    throw new ArgumentOutOfRangeException("An Alias cannot be empty");
+                }
+
                 SqlHelper.ExecuteNonQuery(
                                           "update cmsContentType set alias = @alias where nodeId = @id",
                                           SqlHelper.CreateParameter("@alias", _alias),

umbraco/presentation/umbraco/controls/ContentTypeControlNew.ascx

@@ -50,10 +50,12 @@
   <cc2:Pane ID="Pane3" runat="server">
     <cc2:PropertyPanel ID="pp_name" runat="server" Text="Name">
         <asp:TextBox ID="txtName" CssClass="guiInputText guiInputStandardSize" runat="server"></asp:TextBox>
+        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" ControlToValidate="txtName" runat="server" ErrorMessage="Name cannot be empty!"></asp:RequiredFieldValidator>
     </cc2:PropertyPanel>
     
     <cc2:PropertyPanel ID="pp_alias" runat="server" Text="Alias">
          <asp:TextBox ID="txtAlias" CssClass="guiInputText guiInputStandardSize" runat="server"></asp:TextBox>
+         <asp:RequiredFieldValidator ControlToValidate="txtAlias" runat="server" ErrorMessage="Alias cannot be empty!"></asp:RequiredFieldValidator>
     </cc2:PropertyPanel>
   </cc2:Pane>
   

umbraco/presentation/umbraco/controls/ContentTypeControlNew.ascx.designer.cs

@@ -156,6 +156,15 @@ namespace umbraco.controls {
         /// </remarks>
         protected global::System.Web.UI.WebControls.TextBox txtName;
         
+        /// <summary>
+        /// RequiredFieldValidator1 control.
+        /// </summary>
+        /// <remarks>
+        /// Auto-generated field.
+        /// To modify move field declaration from designer file to code-behind file.
+        /// </remarks>
+        protected global::System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator1;
+        
         /// <summary>
         /// pp_alias control.
         /// </summary>