* InputUserName.cs:

* WebControls.csproj:
* Estimate.aspx: UserName input control

* IValueProvider.cs:
* TemplateException.cs:
* ResultPages.cs: code cleanning

* WorkFlowController.cs: Admin now can register new users

* LocalizedText.resx:
* LocalizedText.Designer.cs: new registration messages

* RegisterModel.cs: The registration message contains the user
  validation decision

WebControls/InputUserName.cs

@@ -0,0 +1,152 @@
+//
+//  SelectUserControl.cs
+//
+//  Author:
+//       Paul Schneider <paulschneider@free.fr>
+//
+//  Copyright (c) 2015 Paul Schneider
+//
+//  This program is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU Lesser General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU Lesser General Public License for more details.
+//
+//  You should have received a copy of the GNU Lesser General Public License
+//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+using System;
+using System.Web;
+using System.Security.Permissions;
+using System.Web.UI;
+using System.Web.UI.WebControls;
+using System.ComponentModel;
+using System.Web.Security;
+
+
+namespace Yavsc.WebControls
+{
+	/// <summary>
+	/// Select user control.
+	/// </summary>
+	[
+		AspNetHostingPermission (SecurityAction.Demand,
+			Level = AspNetHostingPermissionLevel.Minimal),
+		AspNetHostingPermission (SecurityAction.InheritanceDemand, 
+			Level = AspNetHostingPermissionLevel.Minimal),
+		ParseChildren (true),
+		DefaultProperty ("Name"),
+		ToolboxData ("<{0}:ResultPages runat=\"server\"> </{0}:ResultPages>")
+	]
+	public class InputUserName: WebControl
+	{
+		/// <summary>
+		/// Initializes a new instance of the <see cref="WebControls.InputUserName"/> class.
+		/// </summary>
+		public InputUserName ()
+		{
+			Multiple = false;
+		}
+		/// <summary>
+		/// Gets or sets the name.
+		/// </summary>
+		/// <value>The name.</value>
+		[Bindable (true)]
+		[DefaultValue("")]
+		[Localizable(true)]
+		public string Name {
+			get {
+				return (string) ViewState["Name"];
+			}
+			set {
+				ViewState ["Name"]  = value;
+			}
+		}
+		/// <summary>
+		/// Gets or sets the value.
+		/// </summary>
+		/// <value>The value.</value>
+		[Bindable (true)]
+		[DefaultValue("")]
+		[Localizable(true)]
+		public string Value {
+			get {
+				return (string) ViewState["Value"];
+			}
+			set {
+				ViewState ["Value"]  = value;
+			}
+		}
+		/// <summary>
+		/// Gets or sets the in role.
+		/// </summary>
+		/// <value>The in role.</value>
+		[Bindable (true)]
+		[DefaultValue("")]
+		[Localizable(true)]
+		public string InRole {
+			get {
+				return (string) ViewState["InRole"];
+			}
+			set {
+				ViewState ["InRole"]  = value;
+			}
+		}
+
+		/// <summary>
+		/// Gets or sets a value indicating whether this <see cref="Yavsc.WebControls.InputUserName"/> is multiple.
+		/// </summary>
+		/// <value><c>true</c> if multiple; otherwise, <c>false</c>.</value>
+		[Bindable (true)]
+		[DefaultValue(false)]
+		public bool Multiple {
+			get {
+
+				return (bool) ViewState["Multiple"];
+			}
+			set {
+				ViewState ["Multiple"]  = value;
+
+			}
+		}
+
+		/// <summary>
+		/// Renders the contents.
+		/// </summary>
+		/// <param name="writer">Writer.</param>
+		protected override void RenderContents (HtmlTextWriter writer)
+		{
+			writer.AddAttribute ("id", ID);
+			writer.AddAttribute ("name", Name);
+			writer.AddAttribute ("class", CssClass);
+			if (Multiple)
+				writer.AddAttribute ("multiple","true");
+			writer.RenderBeginTag ("select");
+			string[] selected = null;
+			string[] roles = null;
+			if (!string.IsNullOrWhiteSpace (Value)) {
+				selected = Value.Split (',');
+			}
+			if (!string.IsNullOrWhiteSpace (InRole)) {
+				roles = InRole.Split (',');
+			}
+			foreach (MembershipUser u in Membership.GetAllUsers()) {
+				// if roles are specified, members must be in one of them
+				if (roles != null)
+					if (!Array.Exists (roles, x => Roles.IsUserInRole (x)))
+						continue;
+				if (selected!=null)
+					if (Array.Exists(selected, x=> x == u.UserName))
+						writer.AddAttribute ("selected",null);
+				writer.RenderBeginTag ("option");
+				writer.Write (u.UserName);
+				writer.RenderEndTag ();
+			}
+			writer.RenderEndTag ();
+		}
+	}
+}
+