How can I remove the Invalid expression ')' error from aspx page

Hi Pramod_007, you're using a server control, so you must call to a server event there:

<asp:hyperlink id="Log_Out" onload="GoToLoginPage" runat="server" xmlns:asp="#unknown">
</asp:hyperlink>

So, in your code behind (C#, in this case) you will have something like this:

private void GoToLoginPage(object sender, EventArgs e)
{
    //Redirect to your desired page
}

Your question is so simple, but I think that is it that you looking for.

Hope it helps, any way.