Validation summary in code behind (C#)

<%@ Page language="c#" src="ValidationSummary.aspx.cs" AutoEventWireup="false" Inherits="MyOwnValidationSummary" %>
<HTML>
  <body>
    <form id="Form1" method="post" runat="server">
      <P>A number (1 to 10):
        <asp:textbox id="txtValidated" runat="server"></asp:textbox>&nbsp;
        <asp:rangevalidator id="RangeValidator" runat="server" Display="None" Type="Integer" MinimumValue="1" MaximumValue="10" ControlToValidate="txtValidated" ErrorMessage="The First Number Is Not In The Range"></asp:rangevalidator><BR>
        <BR>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Not validated:&nbsp;
        <asp:textbox id="txtNotValidated" runat="server"></asp:textbox><BR>
      </P>
      <P><BR>
        <asp:button id="cmdOK" runat="server" Text="OK"></asp:button><BR>
        <BR>
        <asp:label id="lblMessage" runat="server" EnableViewState="False"></asp:label><BR>
        <BR>
        <asp:ValidationSummary id="ValidationSummary1" runat="server" ShowMessageBox="True"></asp:ValidationSummary></P>
    </form>
  </body>
</HTML>


<%--
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

  public class MyOwnValidationSummary : System.Web.UI.Page
  {
    protected System.Web.UI.WebControls.TextBox txtValidated;
    protected System.Web.UI.WebControls.RangeValidator RangeValidator;
    protected System.Web.UI.WebControls.TextBox txtNotValidated;
    protected System.Web.UI.WebControls.Button cmdOK;
    protected System.Web.UI.WebControls.Label lblMessage;
    protected System.Web.UI.WebControls.ValidationSummary ValidationSummary1;
  
    private void Page_Load(object sender, System.EventArgs e)
    {
      // Put user code to initialize the page here
    }

    #region Web Form Designer generated code
    override protected void OnInit(EventArgs e)
    {
      //
      // CODEGEN: This call is required by the ASP.NET Web Form Designer.
      //
      InitializeComponent();
      base.OnInit(e);
    }
    
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {    
      this.cmdOK.Click += new System.EventHandler(this.cmdOK_Click);
      this.Load += new System.EventHandler(this.Page_Load);

    }
    #endregion

    private void cmdOK_Click(object sender, System.EventArgs e)
    {
      if (!this.IsValid) return;
      lblMessage.Text = "cmdOK_Click event handler executed.";

    }
  }


--%>

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Validation summary in code behind (C#) : ValidationSummary « Validation by Control « ASP.Net

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