Controls on designer surface disappear

Hello,
I am using vs2010 and working on an ASP.Net Website my problem is the controls that I add to the designer surface disappear after I save and switch to code view. As shown in 'Fig1'

Fig1


Description: When I am using the designer surface, I will drag on a series of SqlDataSources and configure them. I then either save and close or just switch back to code view, if I switch back to code view the SqlDataSources do not exist but when I swtch back to designer view they are there, if I save and close then re-open the newly added control are not there.


please help this is very urgent..
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