How to change specific image by upload it from the asp.net page

Hi,
I am developing a CMS ..
I have an asp.net page which has an image, and I want to change this image from the same page, not using FTP, because they want to change this image weekly using the CMS not the FTP,
So I need to have upload control which update that image,
 
please help me..
Yours,
Sayed Mohamed Darwish :)
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