>In my app when the user clicks a contact name I get a reader of the contact data and use it to load the data into the UI. If I click around on multiple contacts very fast I get
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>"There is already an open DataReader associated with this Command which must be closed first." in my app.
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>I have DataReader.Close() in all the right places, but it's possible to initiate another call to the ExecuteReader before the previous reader is closed.
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>I tried Thread.Sleep(15), but it's still possible to click from one contact to another before the previous reader is done.
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>Anyone?
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>[UPDATE] - Now I'm not sure why I'm seeing this, because I'm clicking from one contact to another slowely and it still errors.

Check if SQLDataReader.IsClosed = True before trying to ExecuteReader. Loop if you have to until it is closed.