Validation CSS In ASP.NET

Validation CSS In ASP.NET

ASPX PAGE :-

<table cellpadding="0" cellspacing="30" >
            <tr>
                <td>
                    First Name:
                </td>
                <td>
                    <asp:TextBox ID="TextBox1" runat="server" />&nbsp;<asp:RequiredFieldValidator ID="RequiredFieldValidator1"
                        runat="server" CssClass="triangle-border left" ErrorMessage="FirstName Required"
                        ControlToValidate="TextBox1" ValidationGroup="submit"></asp:RequiredFieldValidator><asp:RegularExpressionValidator
                            ID="RegularExpressionValidator1" runat="server" ControlToValidate="TextBox1"
                            ValidationExpression="[a-zA-Z\s]+" CssClass="triangle-isosceles left" ErrorMessage="FName should be alphabetical"
                            Display="Dynamic" EnableClientScript="true"></asp:RegularExpressionValidator>
                </td>
            </tr>
            <tr>
                <td>
                    Last Name:
                </td>
                <td>
                    <asp:TextBox ID="TextBox2" runat="server" />&nbsp;<asp:RequiredFieldValidator ID="RequiredFieldValidator2"
                        runat="server" CssClass="triangle-border left" ErrorMessage="Last Name required"
                        ControlToValidate="TextBox2" ValidationGroup="submit"></asp:RequiredFieldValidator>
                    <asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server" ControlToValidate="TextBox2"
                        ValidationExpression="[a-zA-Z\s]+" ErrorMessage="LName should be alphabetical"
                        CssClass="triangle-isosceles left" Display="Dynamic" EnableClientScript="true"></asp:RegularExpressionValidator>
                </td>
            </tr>
            <tr>
                <td>
                </td>
                <td>
                    <asp:Button ID="Button1" runat="server" Text="Submit" ValidationGroup="submit" OnClick="Button1_Click" />
                    <asp:Label ID="Label1" runat="server" Font-Bold="true" />
                </td>
            </tr>
        </table>