How to create cookies in asp.net(With example)

A cookie is a small piece of text file stored on user's computer in the form of name-value pair. We use cookies to small information on client’s computer. Common use of cookies is to remember users between visits.

Types of Cookies:

1.      persist  cookies:

It is also known as permanent cookies. Persist cookies are store in hard disk until they expired or deleted. These are not affected by the browser setting. We set the expiry time for cookie.

2.      Non persist cookies (temporary cookies): 

It is also known as session cookies. It stored in memory of web browser, as we close the browser it will lost.

Implementation:

Add a webform to project and design the page as mention below:

<fieldset style="width:400px;height:auto;">

   <legend><strong>Cookies Example:</strong></legend>

    <table>

        <tr><td>Name:</td><td><asp:TextBox ID="txtname" runat="server"></asp:TextBox></td></tr>

        <tr><td></td><td><asp:Label ID="lblerror" runat="server"></asp:Label></td></tr>

        <tr><td><asp:Button ID="btnsubmit" runat="server" Text="Submit" OnClick="btnsubmit_Click" /></td><td><asp:Button ID="btncheck" runat="server" Text="Read Cookies" OnClick="btncheck_Click" /></td></tr>

    </table>

            </fieldset>

IN C#:

protected void btnsubmit_Click(object sender, EventArgs e)

        {

            HttpCookie ck = new HttpCookie("cookie1");

            ck["Cookiename"] = txtname.Text;

            Response.Cookies.Add(ck);

            lblerror.Text = "Cookies Created Successfully";

            txtname.Text = string.Empty;

        }      

        protected void btncheck_Click(object sender, EventArgs e)

        {

            lblerror.Text = "";

            HttpCookie ck = Request.Cookies["cookie1"];

            string Cookiename;

            if (ck != null)

            {

                bookname = ck["Cookiename"];

                txtname.Text = Cookiename;

            }

        }

IN VB:

Protected Sub btnsubmit_Click(ByVal sender As Object, ByVal e AsSystem.EventArgs) Handles btnsubmit.Click

        Dim ck As New HttpCookie("cookie1")

        ck("Cookiename ") = txtname.Text

        Response.Cookies.Add(ck)

        lblerror.Text = "Cookies Created Successfully"

        txtname.Text = String.Empty

    End Sub

    Protected Sub btncheck_Click(ByVal sender As Object, ByVal e AsSystem.EventArgs) Handles btncheck.Click

        lblerror.Text = ""

        Dim ck As HttpCookie = Request.Cookies("cookie1")

        Dim Cookiename As String

        If ck IsNot Nothing Then

           Cookiename = ck("Cookiename")

            txtname.Text = Cookiename

        End If

    End Sub

Create persist cookie:

IN C#:

protected void btnsubmit_Click(object sender, EventArgs e)

        {

            HttpCookie ck = new HttpCookie("cookie1");

            ck["cookiename"] = txtname.Text;

            //cookie expire in 1 day

            ck.Expires = DateTime.Now.AddDays(1);

            Response.Cookies.Add(ck);

            lblerror.Text = "Cookies Created Successfully";

            txtname.Text = string.Empty;

        }

In VB:

Protected Sub btnsubmit_Click(ByVal sender As Object, ByVal e AsSystem.EventArgs) Handles btnsubmit.Click

        Dim ck As New HttpCookie("cookie1")

        ck("cookiename") = txtname.Text

        ck.Expires = DateTime.Now.AddDays(1)

        Response.Cookies.Add(ck)

        lblerror.Text = "Cookies Created Successfully"

        txtname.Text = String.Empty

    End Sub

How  remove persistent cookies before expiration time:

IN C#:

protected void btnsubmit_Click(object sender, EventArgs e)

        {

            HttpCookie ck = new HttpCookie("cookie1");

            ck["cookiename"] = txtname.Text;

            //Expire the cookie before expiration time

            ck.Expires = DateTime.Now.AddDays(-1);

            Response.Cookies.Add(ck);

            lblerror.Text = "Cookies Created Successfully";

            txtname.Text = string.Empty;

        } 

  

IN VB:

Protected Sub btnsubmit_Click(ByVal sender As Object, ByVal e AsSystem.EventArgs) Handles btnsubmit.Click

        Dim ck As New HttpCookie("cookie1")

        ck("cookie1name") = txtname.Text

        'Expire the cookie before expiration time

        ck.Expires = DateTime.Now.AddDays(-1)

        Response.Cookies.Add(ck)

        lblerror.Text = "Cookies Created Successfully"

        txtname.Text = String.Empty

    End Sub