c# - How to format a string as a date with milliseconds

String format date milliseconds
string-format-date-milliseconds.aspx

<%@ Page Language="C#" AutoEventWireup="true"%>

<!DOCTYPE html>  
<script runat="server"> 
    protected void Button1_Click(object sender, System.EventArgs e)  
    {
        //this line create a datetime variable.
        DateTime now = DateTime.Now;

        Label1.Text = "now: " + now.ToString();

        //format date time with milliseconds in string using ToString method.
        Label1.Text += "<br /><br />date time format with milliseconds: " + now.ToString("yyyy-MM-dd hh:mm:ss ffffff");
        Label1.Text += "<br /><br />time format with milliseconds: " + now.ToString("hh:mm:ss ffffff");
        Label1.Text += "<br /><br />string format only milliseconds: " + now.ToString("ffffff");

        //string format date time with milliseconds using string.format method.
        Label1.Text += "<br /><br />date time format with milliseconds: " + string.Format("{0:yyyy-MM-dd ffffff}", now);
    }  
</script>  
  
<html xmlns="http://www.w3.org/1999/xhtml">  
<head id="Head1" runat="server">  
    <title>c# example - string format date milliseconds</title>  
</head>  
<body>  
    <form id="form1" runat="server">  
    <div>  
        <h2 style="color:MidnightBlue; font-style:italic;">  
            c# example - string format date milliseconds
        </h2>  
        <hr width="550" align="left" color="Gainsboro" />  
        <asp:Label   
            ID="Label1"   
            runat="server"  
            Font-Size="Large"  
            >  
        </asp:Label>  
        <br /><br />
        <asp:Button   
            ID="Button1"   
            runat="server"   
            Text="string format date milliseconds"  
            OnClick="Button1_Click"
            Height="40"  
            Font-Bold="true"  
            />  
    </div>  
    </form>  
</body>  
</html>
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