My97DatePicker

http://www.my97.net/index.asp

<input id="txtDate" class="Wdate" type="text" onfocus="WdatePicker()" />

TextBox textbox = new TextBox
 {
       ID = "Name",
       Width =100,                  
 };    
 textbox.Attributes.Add("onfocus", "WdatePicker()");
 textbox.CssClass = "Wdate";