Inconsistent accessibility

Question

I am getting the following error

Inconsistent accessibility: parameter type \'Db.Form1.ConnectionString\' is less accessible than method \'Db.Form1.B

Answer 1

Your ConnectionString type is not public, yet, a public method of a public class is using it as a parameter. You must also make the type public, for instance:

// If it's a class
public class ConnectionString { ... }

Answer 2

As described here, classes and structs are private by default if no access modifier is specified. Where you have defined your struct as:

struct ConnectionString
{
    public string Provider;
    public string DataSource;
    public string UserId;
    public string Password;
    public string Database;
}

you need to instead define it as:

public struct ConnectionString
{
    public string Provider;
    public string DataSource;
    public string UserId;
    public string Password;
    public string Database;
}