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public void database_output(string tabelle, SqlConnection verbindung)
        {
            //select 
            SqlCommand sql = new SqlCommand("Select * FROM " + tabelle, verbindung);
            sql.CommandType = CommandType.Text;
            SqlDataReader result = sql.ExecuteReader();
            while (result.Read())
            {
                int spaltenzahl = result.FieldCount;
                Console.WriteLine("-----------------");
                for (int i = 0; i < spaltenzahl; i++)
                {
                    Console.WriteLine(result.GetName(i) + ":\t\t");
                    Console.WriteLine(result.GetValue(i));
                }
                Console.WriteLine("-----------------");
            }
            result.Close();
 }