Error generating live time in textbox

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ASP.NET

WebForms

I have a textbox that generates current datetime and a updatepanel and timer control to generate time at each seconds.However, my textbox is generating seconds at page refreshment only not at each seconds.

What I have tried:

This is the code for timer:

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<contenttemplate>
<asp:Timer ID="Timer1" runat="server" OnTick="Timer1_Tick" Enabled="true">


code behind:

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{

txtTransDate.Text = DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss");
}

}

protected void Timer1_Tick(object sender, EventArgs e)
{
txtTransDate.Text = DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss");
}