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I want to compare pervious value to current values of same textbox in asp.net
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Another option is to store the data in viewstate.

ASPX Code

XML
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm6.aspx.cs" Inherits="PracticeWeb.WebForm6" %>
<!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 runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="TextBox1" runat="server" Width="200px"></asp:TextBox>
        <br />
        <asp:Button ID="Button1" runat="server" Text="Click to Compare" />
    </div>
    </form>
</body>
</html>


Code Behind

C#
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace PracticeWeb
{
    public partial class WebForm6 : System.Web.UI.Page
    {
        protected void Page_PreRender(object sender, EventArgs e)
        {
            ViewState.Add("PrevValue",TextBox1.Text);
        }
        protected void Page_Load(object sender, EventArgs e)
        {
            if (Page.IsPostBack)
            {
                string strPrev = Convert.ToString(ViewState["PrevValue"]);
                if (strPrev.Equals(TextBox1.Text))
                    Response.Write("Equal");
                else
                    Response.Write("Not Equal");
            }
        }
    }
}
 
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Store the value in somewhere then compare, here an example using hidden field
Compare Old and New Text of TextBox[^]
 
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1. Store in database
2. Use hidden field for the previous value
3. Compare the hiddenfield value with current one ..
 
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Save your value in hidden field
and compare on postback.
 
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