Try validation based on Regular Expression in C#

<%@ Page language="c#" src="RegularExpressionTest.aspx.cs" AutoEventWireup="false" Inherits="RegularExpressionTest" %>
<HTML>
  <body>
    <form id="Form1" method="post" runat="server">
      <asp:textbox id="txtExpression" style="Z-INDEX: 104; LEFT: 224px; POSITION: absolute; TOP: 48px" runat="server" Height="24px" Width="192px"></asp:textbox><asp:button id="cmdSetExpression" style="Z-INDEX: 103; LEFT: 424px; POSITION: absolute; TOP: 48px" runat="server" Height="25px" Width="138px" Text="Set This Expression" CausesValidation="False"></asp:button><asp:label id="lblExpression" style="Z-INDEX: 105; LEFT: 24px; POSITION: absolute; TOP: 16px" runat="server" Height="21px" Width="512px" Font-Bold="True" Font-Size="X-Small" Font-Names="Verdana">Current Expression: (none)</asp:label><asp:label id="Label1" style="Z-INDEX: 106; LEFT: 88px; POSITION: absolute; TOP: 56px" runat="server" Font-Bold="True" Font-Size="X-Small" Font-Names="Verdana">New Expression:</asp:label>
      <DIV style="BORDER-RIGHT: 2px groove; BORDER-TOP: 2px groove; Z-INDEX: 110; LEFT: 16px; BORDER-LEFT: 2px groove; WIDTH: 584px; BORDER-BOTTOM: 2px groove; POSITION: absolute; TOP: 120px; HEIGHT: 160px; BACKGROUND-COLOR: lightyellow" ms_positioning="GridLayout"><asp:validationsummary id="ValidationSummary1" style="Z-INDEX: 111; LEFT: 192px; POSITION: absolute; TOP: 88px" runat="server" Font-Bold="True" Font-Size="X-Small" Font-Names="Verdana"></asp:validationsummary><asp:regularexpressionvalidator id="TestValidator" style="Z-INDEX: 111; LEFT: 208px; POSITION: absolute; TOP: 64px" runat="server" Font-Bold="True" Font-Size="X-Small" Font-Names="Verdana" EnableClientScript="False" ErrorMessage="Failed Validation" ControlToValidate="txtValidate"></asp:regularexpressionvalidator><asp:textbox id="txtValidate" style="Z-INDEX: 111; LEFT: 208px; POSITION: absolute; TOP: 24px" runat="server" Height="24px" Width="192px"></asp:textbox><asp:button id="cmdValidate" style="Z-INDEX: 111; LEFT: 408px; POSITION: absolute; TOP: 24px" runat="server" Height="24px" Width="139px" Text="Validate"></asp:button><asp:label id="Label2" style="Z-INDEX: 111; LEFT: 16px; POSITION: absolute; TOP: 32px" runat="server" Height="16px" Width="184px" Font-Bold="True" Font-Size="X-Small" Font-Names="Verdana">Test Current Expression:</asp:label></DIV>
    </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 RegularExpressionTest : System.Web.UI.Page
  {
    protected System.Web.UI.WebControls.TextBox txtExpression;
    protected System.Web.UI.WebControls.Button cmdSetExpression;
    protected System.Web.UI.WebControls.Label lblExpression;
    protected System.Web.UI.WebControls.Label Label1;
    protected System.Web.UI.WebControls.ValidationSummary ValidationSummary1;
    protected System.Web.UI.WebControls.RegularExpressionValidator TestValidator;
    protected System.Web.UI.WebControls.TextBox txtValidate;
    protected System.Web.UI.WebControls.Button cmdValidate;
    protected System.Web.UI.WebControls.Label Label2;
  
    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.cmdSetExpression.Click += new System.EventHandler(this.cmdSetExpression_Click);
      this.Load += new System.EventHandler(this.Page_Load);

    }
    #endregion

    private void cmdSetExpression_Click(object sender, System.EventArgs e)
    {
      TestValidator.ValidationExpression = txtExpression.Text;
      lblExpression.Text = "Current Expression: ";
      lblExpression.Text += txtExpression.Text;

    }

  }


--%>
Related examples in the same category

1.	Using a RegularExpressionValidator Control to Prevent the Entry of a Special Character (VB.net)
2.	Regular expression validator: ^\d{5}$\|^\d{5}-\d{4}$ (VB.net)
3.	A valid 5 digit zip code
4.	Validate input of US SSN
Try validation based on Regular Expression in C# : Regular Expression Validator « Validation by Control « ASP.Net

Related examples in the same category
