ASP.NET AJAX TextBox Watermark Control Example <%@ Page Language="C#" %> <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="Ajax" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> </script> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> <style type="text/css"> .WaterMarkClass { background-color: #EaEaEa; border: solid 0.5px #818181; padding: 3px; } .WithOutWaterMark { border: solid 1.5px #818181; padding: 3px; } </style> ..