C# mySQL There is already an open DataReader associated with this Connection which must be closed first?

You are using the same connection for the DataReader and the ExecuteNonQuery. This is not supported, according to MSDN: http://msdn.microsoft.com/en-us/library/haa3afyz(v=vs.80).aspx.

Always, always, always put disposable objects inside of using statements. I can't see how you've instantiated your DataReader but you should do it like this.

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