.Net Custom Panel Control with Transparent Background (no png's, css hacks, or problems)

I'm making a really quick post on how you can wrap the jQuery fadeBack control into a .Net Web Custom Control. If you haven't read the article on the fadeBack control, you will have to go here and grab the source.

Save the scripts in a script folder inside your Web Site / Web Application.

To use this control you need to add a reference to the Web Server Control project you have built the code in.

To use this control in your WebForm please Register the Web Server Control dll and namespace on the page like:
<%@ Register Assembly="<<NAME OF WEB SERVER CONTROL PROJECT DLL>>" Namespace="<< THE NAME OF THE NAMESPACE>>" TagPrefix="ctl" %>

Then you can start using the control like so:

<ctl:TransBackPanel ID="backTest" runat="server"
Width="400px" Opacity="20" BackColor="Aquamarine"
BorderColor="Red" BorderWidth="10px" BorderStyle="Solid">
<ctl:TransBackPanel ID="TransBackPanel1" runat="server"
Width="300px" Opacity="20" BackColor="Red"
BorderColor="Green" BorderWidth="10px" BorderStyle="Solid">
<div>Hello World!</div>

Below is the source code for the .Net Web Custom Control, add this to a Web Server Control project and build:

[ToolboxData("<{0}:TransBackPanel runat=server></{0}:TransBackPanel>")]
public class TransBackPanel : Panel

// the jQuery script reference
public const string JQUERY_KEY = "jquery-1.3.2.min.js";
public const string JQUERY_URL = "script/jquery-1.3.2.min.js";

// the transparent background plugin reference
public const string TRANSBACKPANEL_KEY = "jQuery.fadeBack.js";
public const string TRANSBACKPANEL_URL = "script/jQuery.fadeBack.js";

/// <summary>
/// Declare a local variable with the default opacity
/// </summary>
private int _Opacity = 20;

/// <summary>
/// Get / Set opacity to an int - 100 to 0 with 100 being a completely transparent background.
/// </summary>
public int Opacity { get { return _Opacity; } set { _Opacity = value; } }

/// <summary>
/// Override the create child controls method and add the scripts from our constants
/// </summary>
protected override void CreateChildControls()

// Register jQuery like so
if (!Page.ClientScript.IsClientScriptIncludeRegistered(JQUERY_KEY))
Page.ClientScript.RegisterClientScriptInclude(JQUERY_KEY, JQUERY_URL);

// Register the fade back external script
if (!Page.ClientScript.IsClientScriptIncludeRegistered(TRANSBACKPANEL_KEY))
Page.ClientScript.RegisterClientScriptInclude(TRANSBACKPANEL_KEY, TRANSBACKPANEL_URL);


/// <summary>
/// Render the panel control
/// </summary>
/// <param name="writer"></param>
protected override void Render(HtmlTextWriter writer)

// Register the startup script to fade the background to another color
if (!Page.ClientScript.IsStartupScriptRegistered(this.ID))
Page.ClientScript.RegisterStartupScript(typeof(string), this.ID, GetOnloadScript(), true);



/// <summary>
/// Produce a jQuery on load thingy to geter done.
/// </summary>
/// <returns></returns>
private string GetOnloadScript()
return "$(document).ready(function() {\n" +
"$('#" + this.ClientID + "').fadeBack({opacity:" + Convert.ToDouble(Opacity) / 100 + "});\n" +



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Anonymous said...

ok that's fine, i just made a lot of new emo backgrounds at my blog