ExecuteScalar requires an open and available Connection. The connection's current state is closed.ExecuteScalar requires an open and available Connection. The connection's current state is closed. :: RSCN ::
    Object reference not set to an instance of an object.
    Object reference not set to an instance of an object.
    Object reference not set to an instance of an object.
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    Object reference not set to an instance of an object.
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