 jhardman  3,406
Recognized Expert Specialist
I was in the middle of troubleshooting a different problem when my web service stopped working with a very cryptic error message: "specified cast is not valid"
The only location info is that the error came from the web method I called (which is pretty obvious) and this method is gigantic. Arghh. And the web service is running at a remote location - it has no developer tools installed. When I try to pull it up on my box it works - no error, in fact I can't even duplicate the error. So I can't use VWD or VS to troubleshoot.
I think the issue might be time-dependent: The method opens up an XML doc, finds the row that has data for the current time interval, and does some calculations on it and another DataSet before returning the DataSet. The remote location is in a different time zone, and I noticed the error as soon as the remote location time turned 6pm. So I think this may be why I don't see an error on my box running the same web service and the same XML file .
But how on earth can I narrow down the error? Do I need to wait until the middle of the night to duplicate the error conditions? And even then I'm not sure that is the trouble and that won't tell me where the error is. I went through every part of the web service that could be causing the problem, and I added logic that would catch every instance I could think of, but I get nothing.
Anyone have a suggestion?
Jared
3 2125 
It would seem that you have to go through all your type casts and determine which have their correctness determined by time.
jhardman 3,406
Recognized Expert Specialist
I ended up waiting until the error showed up in my time zone so I could debug on my machine. This was so frustrating! It turned out that it was a line which took a value from a DataRow (data type: int) and passed it to a variable (type: int). The problem was that the DataRow had not specified that it wouldn't allow nulls and at some times of the day the value from the xml doc was null so when I tried to pass this to the variable it failed. Disgusting!
Jared
Plater 7,872
Recognized Expert Expert
The problem was that the DataRow had not specified that it wouldn't allow nulls
I am with you on this, my tables like to say no nulls now.
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