RequiredFieldValidator Dynamic Display : RequiredFieldValidator « Validation « ASP.NET Tutorial

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ASP.NET Tutorial » Validation » RequiredFieldValidator 
8. 11. 19. RequiredFieldValidator Dynamic Display
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="Login" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Simple Login Page</title>
</head>
<body>
    <form id="form1" runat="server">
     Username:
          <asp:TextBox id="usernameTextBox" runat="server" />
          <asp:RequiredFieldValidator id="usernameReq"
              runat="server"
              ControlToValidate="usernameTextBox"
              ErrorMessage="Username is required!"
              SetFocusOnError="True" />
     Password and Confirmation:<br />
          <asp:TextBox id="passwordTextBox" runat="server"
              TextMode="Password" />
          <asp:RequiredFieldValidator id="passwordReq"
              runat="server"
              ControlToValidate="passwordTextBox"
              ErrorMessage="Password is required!"
              SetFocusOnError="True" 
              Display="Dynamic" />
          <asp:TextBox id="confirmPasswordTextBox" 
              runat="server"
              TextMode="Password" />
          <asp:RequiredFieldValidator id="confirmPasswordReq"
              runat="server" 
              ControlToValidate="confirmPasswordTextBox"
              ErrorMessage="Password confirmation is required!"
              SetFocusOnError="True" 
              Display="Dynamic" />
          <asp:Button id="submitButton" 
                      runat="server"
                      Text="Submit" 
                      OnClick="submitButton_Click" />
    </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 Login : System.Web.UI.Page
{
    protected void submitButton_Click(object sender, EventArgs e)
    {
        if (Page.IsValid)
        {
            submitButton.Text = "Valid";
        }
        else
        {
            submitButton.Text = "Invalid!";
        }
    }
}
8. 11. RequiredFieldValidator
8. 11. 1. RequiredFieldValidator requires a user to enter a value into a form field before submitting the form.
8. 11. 2. Use asp:RequiredFieldValidator to check the input of an asp:TextBox (VB.net)
8. 11. 3. Use the RequiredFieldValidator's InitialValue to set a default value
8. 11. 4. Specify ErrorMessage for asp:RequiredFieldValidator
8. 11. 5. asp:RequiredFieldValidator will be converted to JavaScript Code after loading in client side
8. 11. 6. A simple use of the RequiredFieldValidator server control (C#)
8. 11. 7. Text field of RequiredFieldValidator server control (VB)
8. 11. 8. Placing values between nodes
8. 11. 9. Working with the InitialValue property
8. 11. 10. Using two RequiredFieldValidator controls for one form element
8. 11. 11. Validating Drop-Down Lists with the RequiredFieldValidator Control
8. 11. 12. Using images for error notifications
8. 11. 13. Disabling client-side validations in a validation control
8. 11. 14. Using sound for error notifications
8. 11. 15. EnableClientScript=false, Display=Static
8. 11. 16. RequiredFieldValidator for login page
8. 11. 17. RequiredFieldValidator with server side validation
8. 11. 18. Hard code error message
8. 11. 19. RequiredFieldValidator Dynamic Display
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