c# - How to format a string as datetime yyyyMMdd

String to datetime yyyyMMdd
string-to-datetime-yyyyMMdd.aspx

<%@ Page Language="C#" AutoEventWireup="true"%>  
  
<!DOCTYPE html>    
<script runat="server">  
    protected void Button1_Click(object sender, System.EventArgs e)  
    {  
        //this section create a string variable.  
        string dateString = "19771208";  
  
        Label1.Text = "string of date..................<br />";
        Label1.Text += dateString;

        //this line convert/parse/transform string to date time object.
        DateTime dateObject = DateTime.ParseExact(dateString, "yyyyMMdd", System.Globalization.CultureInfo.InvariantCulture);

        Label1.Text += "<br /><br />converted date time object from string.........<br />";
        Label1.Text += dateObject;

        //formatted date time object.
        Label1.Text += "<br />" + string.Format("{0:d}", dateObject);
        Label1.Text += "<br />" + string.Format("{0:D}", dateObject);
        Label1.Text += "<br />" + string.Format("{0:Y}", dateObject);
    }    
</script>    
    
<html xmlns="http://www.w3.org/1999/xhtml">    
<head id="Head1" runat="server">    
    <title>c# example - string to datetime yyyyMMdd</title>    
</head>    
<body>    
    <form id="form1" runat="server">    
    <div>    
        <h2 style="color:MidnightBlue; font-style:italic;">    
            c# example - string to datetime yyyyMMdd
        </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 to datetime yyyyMMdd"    
            OnClick="Button1_Click"  
            Height="40"    
            Font-Bold="true"    
            />    
    </div>    
    </form>    
</body>    
</html>
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