upload image to web service using c#

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C#3.0

C#

I am developing a windows mobile application for uploading a image to webservice and retrieving the image from webservice by using c#.
my webservices contain two methods they are...

[WebMethod]
public byte[] imageToByteArray(System.Drawing.Image imageIn)
{
MemoryStream ms = new MemoryStream();
imageIn.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
return ms.ToArray();
}
[WebMethod]
public Image byteArrayToImage(byte[] byteArrayIn)
{
MemoryStream ms = new MemoryStream(byteArrayIn);
Image returnImage = Image.FromStream(ms);
return returnImage;
}

in my application one picture box and two buttons for upload and download.
i added references to webservices also. i don't know what code to write on upload n download button for uploading and downloading image.
help me out..

[Edited]Code is wrapped in "pre" tags[/Edited]