I wanted to know why this error is occurring.
I created a class that extends another one, but when I call its constructor (parent class) it generates an error.
There it says that there is no constructor with 1 parameter, but as you can see in the second image, there is.
In your code:
class MySQLConnection : MySqlConnection
In the superclass code:
public sealed class MySqlConnection : DbConnection, IDisposable, ICloneable
Basically, you should not inherit from MySqlConnection . There is no reason to do this and that sealed in the class declaration says that it is forbidden to inherit from it.
I do not know what you're trying to do, but whatever it is, you should not try to inherit from MySqlConnection .
In addition, having two classes whose name only differs in upper / lower case is a bad programming practice, as it is very confusing.
Try to do a different method:
public MySQLConnection(MySQLData data, MySQLUser user)
{
base("meh");
} /* ou */
public MySQLConnection(MySQLData data, MySQLUser user)
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