autocomplete feature in text box Turning off

Solution : 1

<asp:TextBox Runat="server" ID="txtUserName" placeholder="Enter User Name"  autocomplete="off"></asp:TextBox>


Solution : 2

< script src = "Scripts/jquery-1.6.4.min.js" > < /script> < script type = "text/javascript" > 
    $(document).ready(function() 
    { 
        $("#<%=txtUserName.ClientId %>").attr('autocomplete', 'off'); 
    }); 
//document.getElementById("<%=txtUserName.ClientID %>").autocomplete = "off" ;
< /script> 


<asp:TextBox Runat="server" ID="txtUserName" placeholder="Enter User Name"></asp:TextBox>



Solution : 3

Asp design page 

<asp:TextBox Runat="server" ID="txtUserName" placeholder="Enter User Name"></asp:TextBox>

C# Class file 
-----------------
protected void Page_Load(object sender, EventArgs e) 
{ 
   
 txtUserName.Attributes.Add("autocomplete", "off"); 
   
}