how to create an active image to display the level of contents in a container

[zakkattac]

I am not sure how to ask this as I have no idea what i am looking for is called.Here goes. I need to graphically display the level of a container. for example: Lets say i am monitoring the contents of a glass. I just filled the glass up so its contents are at 100% so i want to display an image of the glass that is 100% filled with water, now i want the level of the water to drop in real time as the level of contents drop (in the DB).I need a solution in c# if possible pleaseAny help will be highly appreciated!(I know the question might be vague, but please help if possible)Thanks in advance.