C# connection with MySQL Database

once again im not really getting any further by just using google and searching through the forum, so here we go:

Im trying to establish a connection with C# and a MySQL Database (which is running on phpmyadmin).

This is the Code I got so far:

using System;
using System.Data;
using MySql.Data.MySqlClient;
using MySql.Data;


namespace csharpdatabasefinal
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("C#: Connect to MySQL Database using localhost." + Environment.NewLine);
            string connectionString = "server=localhost;user=csharptest;database=csharptest;port=3306;password=123";
            MySqlConnection conn = new MySqlConnection(connectionString);

            try
            {
                conn.Open();
                Console.WriteLine("Connection is " + conn.State.ToString() + Environment.NewLine);

                conn.Close();
                Console.WriteLine("Connection is " + conn.State.ToString() + Environment.NewLine);

            }catch(MySql.Data.MySqlClient.MySqlException ex)
            {
                Console.WriteLine("Error: " + ex.Message.ToString());
            }

            Console.WriteLine("Press any key to exit..");
            Console.Read();
        }
    }
}

And this is the Error I get, I guess it has something to do with the References but im not really sure.. I added as reference "MySql.Data.dll" & "System.Security.Permissions.dll". I added the Systen.Security.Permission.dll because in a previous error he asked for it.

And this is the Error I get:

Click me!(Error-Image)

Here the full Error Code:

System.TypeInitializationException
  HResult=0x80131534
  Message=The type initializer for 'MySql.Data.MySqlClient.Replication.ReplicationManager' threw an exception.
  Source=MySql.Data
  StackTrace:
   at MySql.Data.MySqlClient.Replication.ReplicationManager.IsReplicationGroup(String groupName)
   at MySql.Data.MySqlClient.MySqlConnection.Open()
   at csharpdatabasefinal.Program.Main(String[] args) in C:\Users\anonym\source\repos\csharpdatabasefinal\csharpdatabasefinal\Program.cs:line 19

Inner Exception 1:
FileNotFoundException: Could not load file or assembly 'System.Configuration.ConfigurationManager, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.

Enable "native code debugging" in Project -> Properties -> Debug

If that does't work, try adding the MySQL dll via nuget:

Install-Package MySql.Data -Version 8.0.20