an error keeping popping up in my codes (connection already open)

Question

This error keeps popping up!!! An unhandled exception of type \'System.InvalidOperationException\' occurred in MySql.Data.dll

Additional information: The connection is a

Answer 1

It looks like you are not closing the connection after executing the query. You only have

con.Open()

and are not closing the connection after

cmd.ExecuteNonQuery()