ASP.NET AJAX TextBox Watermark Control

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ASP.NET AJAX TextBox Watermark Extender control can be attached to an ASP.NET TextBox control to make it work as watermark TextBox. If TextBox is empty, it will display a message to the user with a custom CSS style. It user will type something in the TextBox that initial message will disappear. The main purpose of TextBox is to provide extra information to the user about the data required in the TextBox. In this tutorial I will show you how you can use ASP.NET AJAX TextBox Watermark Control in your ASP.NET Projects.

To start this tutorial you need to create a blank ASP.NET page that have an instance of AJAX ScriptManager control on top. This control is required to use any AJAX related feature in ASP.NET page and to enable partial page rendering.

<asp:ScriptManager ID="ScriptManager1" runat="server" />

In the Web Form, Add two TextBox Controls along with two TextBoxWatermarkExtender controls as shown in the following markup. 

Name:

<asp:TextBox ID="TextBox1" runat="server" CssClass="nonwatermarked" /> 

<ajax:TextBoxWatermarkExtender 
   ID="TextBoxWatermarkExtender1" 
   runat="server" 
   Enabled="True" 
   TargetControlID="TextBox1" 
   WatermarkCssClass="watermarked" 
   WatermarkText="Enter Name Here"> 
</ajax:TextBoxWatermarkExtender> 

<br /> 

Phone:

<asp:TextBox ID="TextBox2" runat="server" CssClass="nonwatermarked" /> 

<ajax:TextBoxWatermarkExtender 
   ID="TextBoxWatermarkExtender2" 
   runat="server" 
   Enabled="True" 
   TargetControlID="TextBox2" 
   WatermarkCssClass="watermarked" 
   WatermarkText="Enter Phone Here"> 
</ajax:TextBoxWatermarkExtender> 

<br /> <br /> 

<asp:Button ID="Button1" runat="server" Text="Submit " />

The TextBoxWatermarkExtender control is very straight forward and it has only few properties to make it work. TargetControlID property needs the ID of a target TextBox control on which you want to display watermark text. WatermarkText property needs the text you want to display when the TextBox is empty. WatermarkCssClass needs the name of the CSS class that has some styles defined for the TextBox such as background color or border styles. Note TextBox also has CssClass property to attach a CSS class to it for styling but WatermarkCssClass only apply styles when TextBox is empty. Following are the two CSS classes used in the above example:

.watermarked 
{ 
   background-color: #E1E1E1; 
   border: solid 1px #808080; 
   padding: 2px; 
} 

.nonwatermarked 
{ 
   border: solid 1px #808080; 
   padding: 2px; 
}

You can add the above CSS classes into an external CSS file and can attach the CSS file with ASP.NET page using link tag.

<link href="StyleSheet.css" rel="stylesheet" type="text/css" />
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This Post Has 8 Comments

  1. Çağdaş May 16, 2013 Reply

    Thanks.

  2. basam July 13, 2012 Reply

    Wonderful samples.

    God Bless you!!

  3. Ajit June 27, 2012 Reply

    Nice job

  4. Sekhar May 29, 2012 Reply

    Nice article

  5. garima April 16, 2012 Reply

    bhut badhiya hai ye

  6. senthil February 15, 2012 Reply

    nice..

  7. Moddathir November 20, 2011 Reply

    Mr. Waqas Anwar

    Thank you for you article, coz it solve my problem fast when i assign two different stylesheets files to my application that using the TextBoxWatermarkExtender .

  8. Rajpandian June 6, 2010 Reply

    Very think is good i neeed one think . in MultiLine text box water mark align as top .. i need Water mark test align in center of MultiLine test.. please help me

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