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How to Implement Remember Me functionality using CheckBox ASP.Net(C#)

In this post I will explain how to implement Remember me functionality using check box.
When the Button btnLogin is clicked the following event handler is executed which first checks whether the chkRememberMe is checked. If it is checked then it save the UserName and Password in the Cookies and sets their expiration date to 30 days in future from the current date. And if it is not checked then it sets the expiration date to 1 day in past so that Cookie is destroyed.

Default.aspx

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    UserName:
    <asp:TextBox ID="txtUserName" runat="server"></asp:TextBox><br />
    Password:
    <asp:TextBox ID="txtPassword" TextMode="Password" runat="server"></asp:TextBox><br />
    Remember me:
    <asp:CheckBox ID="chkRememberMe" runat="server" /><br />
    <asp:Button ID="btnLogin" runat="server" Text="Login" OnClick="Login_Click" />
    </form>
</body>
</html>


Now in Page_Load event we will check if the Cookie exists and if yes then we will set the TextBoxes for UserName and Password with their respective Cookie value.

Default.aspx.cs

 protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                if (Request.Cookies["UserName"] != null && Request.Cookies["Password"] != null)
                {
                    txtUserName.Text = Request.Cookies["UserName"].Value;
                    txtPassword.Attributes["value"] = Request.Cookies["Password"].Value;
                }
            }
        }

        protected void Login_Click(object sender, EventArgs e)
        {
            if (chkRememberMe.Checked)
            {
                Response.Cookies["UserName"].Expires = DateTime.Now.AddDays(30);
                Response.Cookies["Password"].Expires = DateTime.Now.AddDays(30);
            }
            else
            {
                Response.Cookies["UserName"].Expires = DateTime.Now.AddDays(-1);
                Response.Cookies["Password"].Expires = DateTime.Now.AddDays(-1);

            }
            Response.Cookies["UserName"].Value = txtUserName.Text.Trim();
            Response.Cookies["Password"].Value = txtPassword.Text.Trim();
        }

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