Start Date End Date Validation In Asp.net: Start date should be less than End date

Start Date End Date Validation In Asp.net: Start date should be less than End date.

 

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" Culture = "en-GB" %>
 
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default"
    Culture="en-GB" %>
 
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<!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>Start Date End Date Validation In Asp.net: Start date should be less than End date.</title>    
</head>
<body>
    <form id="form2" runat="server">
    <cc1:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
    </cc1:ToolkitScriptManager>
    Start Date:
    <asp:TextBox ID="txtStartDate" runat="server" Text="" ReadOnly="true"></asp:TextBox>
<asp:ImageButton runat="server" ID="imgPopup1" ImageUrl="~/Calendar.png" />
    <cc1:CalendarExtender ID="CalendarExtender1" runat="server" TargetControlID="txtStartDate"
        PopupButtonID="imgPopup1" Format="dd/MM/yyyy" />
    End Date:
    <asp:TextBox ID="txtEndDate" runat="server" Text="" ReadOnly="true"></asp:TextBox>
    <asp:ImageButton runat="server" ID="imgPopup2" ImageUrl="~/Calendar.png" />
    <cc1:CalendarExtender ID="CalendarExtender2" runat="server" TargetControlID="txtEndDate"
        PopupButtonID="imgPopup2" Format="dd/MM/yyyy" />
    <br />
    <asp:CompareValidator ID="CompareValidator1" ValidationGroup="Date" ForeColor="Red"
        runat="server" ControlToValidate="txtStartDate" ControlToCompare="txtEndDate"
        Operator="LessThan" Type="Date" ErrorMessage="Start date must be less than End date."></asp:CompareValidator>
    <br />
   <asp:Button ID="btn_Compare" runat="server" Text="Compare" ValidationGroup="Date" />
    </form>
</body>
</html>

 

2021-10-03