Preview:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace val2
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            ValidationSettings.UnobtrusiveValidationMode = UnobtrusiveValidationMode.None;
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            if (Page.IsValid)
            {
                Label1.Text = "Valid Email and Phone";
            }
        }
    }
}


<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="val2.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            Email:
            <asp:TextBox ID="txtEmail" runat="server"></asp:TextBox>
            <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="txtEmail" ErrorMessage="Enter a valid email" ForeColor="Red" ValidationExpression="^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$"></asp:RegularExpressionValidator>
        </div>
        Phone:
        <asp:TextBox ID="txtPhone" runat="server"></asp:TextBox>
        <asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server" ControlToValidate="txtPhone" ErrorMessage="Enter a valid phone number" ForeColor="Red" ValidationExpression="^\d{10}$"></asp:RegularExpressionValidator>
        <p>
            <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Submit" />
        </p>
        <asp:Label ID="Label1" runat="server" Text="Status"></asp:Label>
    </form>
</body>
</html>
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