compare textbox values with

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ASP.NET

I want to compare pervious value to current values of same textbox in asp.net

Posted 1-Jul-11 23:21pm

somendra chaudhary

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De, Subhendu · Answer 1 · 2011-07-03T08:21:00

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");
            }
        }
    }
}

thatraja · Answer 2 · 2011-07-01T23:34:00

Solution 1

Store the value in somewhere then compare, here an example using hidden field
Compare Old and New Text of TextBox[^]

Posted 1-Jul-11 23:34pm

thatraja

Nasser Malik · Answer 3 · 2011-07-03T07:40:00

Solution 2

1. Store in database
2. Use hidden field for the previous value
3. Compare the hiddenfield value with current one ..

Posted 3-Jul-11 7:40am

Nasser Malik

Nasser Malik · Answer 4 · 2012-07-16T23:58:00

Solution 4

Save your value in hidden field
and compare on postback.

Posted 16-Jul-12 23:58pm