It is very easy to use placeholder text in texbox control
Step1:-
Use placeholder property in textbox tool
placeholder=”Enter Email id “
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table>
<tr>
<td>S.No </td>
<td>
<asp:TextBox ID="TextBox1" runat="server" placeholder="Enter Email id " ></asp:TextBox> </td>
</tr>
<tr>
<td> Name </td>
<td> </td>
</tr>
<tr>
<td>Email ID </td>
<td> </td>
</tr>
</table>
</div>
</form>
</body>
</html>
Step2:-
Step3:-
now you can see place holder
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