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Dynamically change checkbox border color in ASP.NET

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If you want to change Border-color of the checkbox programmatically then you should use Border-color  property at codebehind.
lets take a simple example for completing the task. Take a webform control and place one checkBox and one button control onto the design window. Now at time we can handle onClick event.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default4.aspx.cs" Inherits="Default4" %>

<!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:CheckBox ID="CheckBox1" runat="server" BorderColor="Red"
            BorderStyle="Dotted" BorderWidth="4px" Text="CheckBox for multiple selection" />
        <br />
        <br />
        <asp:Button ID="Button1" runat="server" onclick="Button1_Click"
            Text="Change Border Color" />
    </div>
    </form>
</body>
</html>

Codebehind

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

public partial class Default4 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        CheckBox1.BorderColor = System.Drawing.Color.Green;
    }

}
Output
Dynamically change checkbox border color in ASP.NET

Dynamically change checkbox border color in ASP.NET

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