asp:ImageButton Issues With Form Submission on Enter Key Press

Background:
I had a webform that contained two text fields, an asp:ImageButton and an asp:Button. The ImageButton and Button each had their own event handlers doing very different things. The OnClick event handler for the ImageButton performed an action specific to the Textbox to the left of it, and was only intended to fire when the user clicked the button. The Button control performed an action specific to both Textboxes, and was intended to fire either when clicked OR upon depressing the enter key.

Problem:
The form was always posting-back when the enter key was depressed -- even in the case where the user entered text into the Textbox belonging to the Button control.

Solution:
The first thing that came to mind was to set a property on the ImageButton to prevent submission just as the
UseSubmitBehavior="false" works for asp:Button... you would think! But, nah... this is not a property of asp:Imagebutton. I tried implementing Javascript to listen for a keyclick and disable the submission by the Imagebutton when enter (13) was clicked, but no such luck. When such things happen, who you gonna call... Google!

After doing some searching around, I decided to replace with the ImageButton with a regular asp:Button control and set UseSubmitBehavior="false". But, now this looked like regular button and needed to resemble the previous ImageButton implementation that had a magifying glass image. The problem is that asp:Button does not have a property to assign an image... that's why asp:ImageButton was created!

To get around this, I assigned an inline style (could have also been done in CSS) setting a background:url to the image and setting the width/height to the size of the image. Since the location of the image file is in a different directory than the WebForm, and the root of the URL may change, I did this in the Page_Load of the code-behind by adding it as an attribute to the asp:Button control as follows:

btnGoTo.Attributes.Add("style", "position: relative; background:url(" + Request.ApplicationPath + "/images/expandview.gif) no-repeat; border:none 0px; width:24px; height:24px; vertical-align:top; cursor:pointer;");

This did the trick!