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Manual Validation

File: Default.aspx <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="ManualValidation" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server">     <title>Manual Validation</title> </head> <body>     <form id="form1" runat="server">     <div>         A number (1 to 10):       <asp:TextBox id="txtValidated" runat="server"></asp:TextBox>&nbsp;       <asp:RangeValidator id="RangeValidator"                             runat="server"                            ErrorMessage="This Number Is Not In The Range"                            ControlToValidate="txtValidated"                            MaximumValue="10"                            MinimumValue="1"                            Type="Integer"                            EnableClientScript="False"></asp:RangeValidator><br/>     <br />     Not validated:     <asp:TextBox id="txtNotValidated" runat="server"></asp:TextBox><br/>         <br />     <br />     <asp:Button id="cmdOK" runat="server" Text="OK" OnClick="cmdOK_Click" Width="36px"></asp:Button><br />     <br />     <asp:Label id="lblMessage" runat="server" EnableViewState="False"></asp:Label>     </div>     </form> </body> </html> File: Default.aspx.cs using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; public partial class ManualValidation : System.Web.UI.Page {   protected void cmdOK_Click(object sender, EventArgs e)   {     string errorMessage = "<b>Mistakes found:</b><br />";     bool pageIsValid = true;     foreach (BaseValidator ctrl in this.Validators)     {       if (!ctrl.IsValid)       {         pageIsValid = false;         errorMessage += ctrl.ErrorMessage + "<br />";           TextBox ctrlInput = (TextBox)this.FindControl(ctrl.ControlToValidate);         errorMessage += " * Failed: ";         errorMessage += ctrlInput.Text + "<br />";       }     }     if (!pageIsValid) lblMessage.Text = errorMessage;   } }