The data URI scheme is an URI scheme (the Uniform Resource Identifier scheme) that provides a way to include data in-line in web pages as if they were external resources. Data URIs are a form of Uniform Resource Locators, although they do not in fact remotely locate anything. Instead, the resource data is contained within a URL string itself as a base64-encoded string. This saves the browser from having to make additional HTTP requests to external resources, and can thus increase page loading speed.
This online example allows you to upload an image using the ASPxUploadControl and convert the image into a base64 encoded data URI for embedding images into html or css.
Your image elements will look as follows:
[HTML]<imgsrc="your_image_bytes_in_base_64"/>