me and my friends wrote a verrrry big c# asp.net application which talks to loads and loads of stored procedures.However just recently we noticed that if me and my friend are both logged in, and we both make modifications on the same database, but to different items. The results get mixed up somehow....Is there an easy way to fix this problem? I don't really know what information I should provide, so my apologies for this. Would u kindly tell me what info is needed to help me?We use .xsd dataobjects to connect with our stored procedures. There is too much code to provide anyEDIT: Dirty reads sounds a lot like our problem. Thanks for the links. So should I add an isolation model to all my stored procedures?