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Understanding ASP.NET Validation Techniques

, 22 Feb 2012 CPOL
This article aims at understanding the basic validation techniques and controls provided by ASP.NET framework.
<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">

<html xmlns="" >
<head runat="server">
    <title>Untitled Page</title>
    <script type="text/javascript" language="javascript">
    function ValidateOnClient(source, arguments)
        if('-') != -1)
            arguments.IsValid = false;
    <form id="form1" runat="server">
        Last postback on:
        <asp:Label ID="Label1" runat="server"></asp:Label><br />
        <br />
        Name&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp;<asp:TextBox ID="txtName" runat="server"></asp:TextBox>
        <asp:RequiredFieldValidator ID="RequiredFieldValidatorName" runat="server" ControlToValidate="txtName"
            ErrorMessage="Name is Required">*</asp:RequiredFieldValidator>
        <asp:CustomValidator ID="CustomValidator1" runat="server" ClientValidationFunction="ValidateOnClient"
            ErrorMessage="'-' is not allowed in input" ControlToValidate="txtName">*</asp:CustomValidator><br />
        <br />
        Name Again:&nbsp;
        <asp:TextBox ID="txtName2" runat="server"></asp:TextBox>
        <asp:CompareValidator ID="CompareValidatorName" runat="server" ControlToCompare="txtName"
            ControlToValidate="txtName2" ErrorMessage="Name should be same in both fields">*</asp:CompareValidator>
        <br />
        <br />
        Age &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
        <asp:TextBox ID="txtAge" runat="server"></asp:TextBox>
        <asp:RangeValidator ID="RangeValidatorAge" runat="server" ControlToValidate="txtAge"
            ErrorMessage="Age should be between 18 to 50" MaximumValue="50" MinimumValue="18">*</asp:RangeValidator>
        <br />
        <br />
        email &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
        <asp:TextBox ID="txtMail" runat="server"></asp:TextBox>&nbsp;
        <asp:RegularExpressionValidator ID="RegularExpressionValidatorMail" runat="server"
            ControlToValidate="txtMail" ErrorMessage="email format is wrong" ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*">*</asp:RegularExpressionValidator>
        <asp:CustomValidator ID="CustomValidator2" runat="server" ControlToValidate="txtMail"
            EnableClientScript="False" ErrorMessage="- is not allowed" OnServerValidate="CustomValidator2_ServerValidate">*</asp:CustomValidator><br />
        <br />
        <asp:Button ID="Button1" runat="server" Text="Button" />
        <br />
        <br />
        <asp:ValidationSummary ID="ValidationSummary1" runat="server" />
        &nbsp;<br />
        <br />

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About the Author

Rahul Rajat Singh
Software Developer (Senior)
India India
I Started my Programming career with C++. Later got a chance to develop Windows Form applications using C#. Currently using C#, ASP.NET & ASP.NET MVC to create Information Systems, e-commerce/e-governance Portals and Data driven websites.

My interests involves Programming, Website development and Learning/Teaching subjects related to Computer Science/Information Systems. IMO, C# is the best programming language and I love working with C# and other Microsoft Technologies.
  • Microsoft Certified Technology Specialist (MCTS): Web Applications Development with Microsoft .NET Framework 4
  • Microsoft Certified Technology Specialist (MCTS): Accessing Data with Microsoft .NET Framework 4
  • Microsoft Certified Technology Specialist (MCTS): Windows Communication Foundation Development with Microsoft .NET Framework 4

If you like my articles, please visit my website for more:[^]

  • Microsoft MVP 2015

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