diff --git a/Core/Core.csproj b/Core/Core.csproj
index cbf316b..78eb99f 100644
--- a/Core/Core.csproj
+++ b/Core/Core.csproj
@@ -45,7 +45,20 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="DataObject.cs" />
+    <Compile Include="delegates\Lazy.cs" />
+    <Compile Include="delegates\Predicate.cs" />
+    <Compile Include="exceptions\CriticalException.cs" />
+    <Compile Include="exceptions\FLocalException.cs" />
+    <Compile Include="exceptions\ObjectDoesntHaveAnIdException.cs" />
+    <Compile Include="extensions\Delegate.cs" />
+    <Compile Include="extensions\Extensions.cs" />
+    <Compile Include="extensions\String.cs" />
+    <Compile Include="IDataObject.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Registry.cs" />
+    <Compile Include="Switch.cs" />
+    <Compile Include="Util.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
diff --git a/Core/DataObject.cs b/Core/DataObject.cs
new file mode 100644
index 0000000..239c083
--- /dev/null
+++ b/Core/DataObject.cs
@@ -0,0 +1,59 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Diagnostics;
+
+namespace FLocal.Core {
+
+	abstract class DataObject<TKey, T> : IDataObject<TKey, T>
+        where T : DataObject<TKey, T>, new()
+        where TKey : struct {
+
+        private TKey? _id;
+
+        public TKey id {
+            get {
+                if(this.isNewObject) {
+                    throw new ObjectDoesntHaveAnIdException();
+                }
+                return this._id.Value;
+            }
+        }
+
+        public bool isNewObject {
+            get {
+                return !this._id.HasValue;
+            }
+        }
+
+        private bool isJustCreated;
+
+        public DataObject() {
+            Debug.Assert(this is T);
+            this.isJustCreated = true;
+            this._id = null;
+        }
+
+        public static T LoadById(TKey id) {
+            return registry.Get(id);
+        }
+
+        protected virtual void AfterCreate() { }
+
+        public void CreateByIdFromRegistry(TKey id) {
+            if(!this.isJustCreated) throw new CriticalException("Object already has an id");
+            this._id = id;
+            this.isJustCreated = false;
+            this.AfterCreate();
+        }
+
+        public static Registry<TKey, T> registry {
+            get {
+                return Registry<TKey, T>.instance;
+            }
+        }
+
+    }
+
+}
diff --git a/Core/IDataObject.cs b/Core/IDataObject.cs
new file mode 100644
index 0000000..14dac6b
--- /dev/null
+++ b/Core/IDataObject.cs
@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace FLocal.Core {
+
+	interface IDataObject<TKey, TData> /*: IDataObject<TKey>*/
+        where TData : IDataObject<TKey, TData>, new()
+        where TKey : struct {
+
+        //static TData LoadById(TKey id);
+
+        //static TData CreateByIdFromRegistry(TKey id);
+
+        void CreateByIdFromRegistry(TKey id);
+
+        //TKey GetId();
+
+        TKey id {
+            get;
+        }
+
+    }
+
+}
diff --git a/Core/Registry.cs b/Core/Registry.cs
new file mode 100644
index 0000000..c3a2a66
--- /dev/null
+++ b/Core/Registry.cs
@@ -0,0 +1,50 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace FLocal.Core {
+    class Registry<TKey, TData>
+        where TData : IDataObject<TKey, TData>, new()
+        where TKey : struct {
+
+        public static readonly Registry<TKey, TData> instance = new Registry<TKey,TData>();
+
+        private Dictionary<TKey, TData> storage;
+
+        private HashSet<TKey> locks;
+
+        protected Registry() {
+            this.storage = new Dictionary<TKey,TData>();
+            this.locks = new HashSet<TKey>();
+        }
+        
+        public TData Get(TKey id) {
+            if(this.locks.Contains(id)) throw new CriticalException("Locked");
+            if(!this.storage.ContainsKey(id)) {
+                try {
+                    this.locks.Add(id);
+
+                    //this.storage[id] = IDataObject<TKey, TData>.CreateByIdFromRegistry(id);
+                    //this.storage[id] = TData.CreateByIdFromRegistry(id);
+                    TData obj = new TData();
+                    obj.CreateByIdFromRegistry(id);
+                    this.storage[id] = obj;
+
+                    this.locks.Remove(id);
+                } catch(FLocalException e) {
+                    this.locks.Remove(id);
+                    throw e;
+                }
+            }
+            return this.storage[id];
+        }
+
+        public bool IsCached(TKey id) {
+            if(this.locks.Contains(id)) throw new CriticalException("locked");
+            return this.storage.ContainsKey(id);
+        }
+
+    }
+
+}
diff --git a/Core/Switch.cs b/Core/Switch.cs
new file mode 100644
index 0000000..abcf7da
--- /dev/null
+++ b/Core/Switch.cs
@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace FLocal.Core {
+
+    class Switch<TResult> : List<KeyValuePair<Predicate, Func<TResult>>> {
+
+        public void Add(Predicate checker, Func<TResult> calculator) {
+            this.Add(new KeyValuePair<Predicate,Func<TResult>>(checker, calculator));
+        }
+
+        public void Add(bool checkResult, Func<TResult> calculator) {
+            this.Add(() => checkResult, calculator);
+        }
+
+        public TResult Value {
+            get {
+                return this.Single(kvp => kvp.Key(), () => {
+                    throw new FLocalException("Not found");
+                }).Value();
+            }
+        }
+
+    }
+
+}
diff --git a/Core/Util.cs b/Core/Util.cs
new file mode 100644
index 0000000..ba9cf52
--- /dev/null
+++ b/Core/Util.cs
@@ -0,0 +1,117 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace FLocal.Core {
+
+    class Util {
+
+        private static bool? _isRunningOnMono;
+        
+        public static bool isRunningOnMono {
+            get {
+                if(!_isRunningOnMono.HasValue) {
+                    _isRunningOnMono = (Type.GetType("Mono.Runtime") != null);
+                }
+                return _isRunningOnMono.Value;
+            }
+        }
+
+        public static bool string2bool(string _val) {
+            switch(_val.ToLower()) {
+                case "y":
+                case "yes":
+                case "true":
+                case "enabled":
+                case "on":
+                case "1":
+                    return true;
+                case "n":
+                case "no":
+                case "false":
+                case "disabled":
+                case "off":
+                case "0":
+                    return false;
+                default:
+                    throw new FLocalException("Cannot parse string '" + _val + "'; try to use 'n' or 'y'");
+            }
+        }
+
+        public static T string2enum<T>(string value) {
+            return (T)System.Enum.Parse(typeof(T), value);
+        }
+
+		public static void CheckEmail(string email) {
+            if(!email.Contains('@') || !email.Contains('.')) throw new FLocalException("Wrong email '" + email + "'");
+        }
+
+        public static Predicate<string> PhoneValidator {
+            get {
+                return phone => {
+                    return true;
+                };
+            }
+        }
+
+        public static T EnumParse<T>(string name) {
+            return (T)Enum.Parse(typeof(T), name, true);
+        }
+
+        public static IEnumerable<int> Range(int start, int count, int step) {
+            if(step == 0) {
+                throw new FLocalException("Step could not be equal to zero");
+            }
+            for(int i=0; i<count; i++) {
+                yield return start + (i*count);
+            }
+        }
+
+        public static IEnumerable<int> Range(int start, int count) {
+            return Range(start, count, 1);
+        }
+
+        public static IEnumerable<T> CreateList<T>(int length, Func<int, T> creator) {
+            return from i in Range(0, length) select creator(i);
+        }
+
+        public static IEnumerable<T> CreateList<T>(int length, Func<T> creator) {
+            return CreateList<T>(length, num => creator());
+        }
+
+        private static readonly Random RandomGenerator = new Random();
+
+        public static int RandomInt(int gethan, int lessthan) {
+            return RandomGenerator.Next(gethan, lessthan);
+        }
+
+        public enum RandomSource {
+            LETTERS,
+            LETTERS_DIGITS,
+            CYRILLIC,
+        }
+
+        private static Dictionary<RandomSource, string> randoms = new Dictionary<RandomSource,string> {
+            { RandomSource.LETTERS, "abcdefghijklmnopqrstuvwxyz" },
+            { RandomSource.LETTERS_DIGITS, "abcdefghijklmnopqrstuvwxyz0123456789" },
+            { RandomSource.CYRILLIC, "абвгдеёжзийклмнопрстуфхцчшщьыъэюя" },
+        };
+        
+        public static string RandomString(int length, RandomSource source) {
+            return new String(
+                CreateList(length, (
+                    (Func<string, char>)(str => str[RandomInt(0, str.Length)])
+                ).Curry(
+                    randoms[source]
+                )).ToArray()
+            );
+        }
+
+        public static string RandomString(int length) {
+            return RandomString(length, RandomSource.LETTERS);
+        }
+
+    }
+
+}
diff --git a/Core/delegates/Lazy.cs b/Core/delegates/Lazy.cs
new file mode 100644
index 0000000..855bf58
--- /dev/null
+++ b/Core/delegates/Lazy.cs
@@ -0,0 +1,8 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace FLocal.Core {
+    delegate T Lazy<T>();
+}
diff --git a/Core/delegates/Predicate.cs b/Core/delegates/Predicate.cs
new file mode 100644
index 0000000..b270987
--- /dev/null
+++ b/Core/delegates/Predicate.cs
@@ -0,0 +1,10 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace FLocal.Core {
+
+    delegate bool Predicate();
+
+}
diff --git a/Core/exceptions/CriticalException.cs b/Core/exceptions/CriticalException.cs
new file mode 100644
index 0000000..f1b899a
--- /dev/null
+++ b/Core/exceptions/CriticalException.cs
@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace FLocal.Core {
+
+    partial class CriticalException : FLocalException {
+
+        public CriticalException(string Message) : base(Message) { }
+
+    }
+
+}
diff --git a/Core/exceptions/FLocalException.cs b/Core/exceptions/FLocalException.cs
new file mode 100644
index 0000000..6968884
--- /dev/null
+++ b/Core/exceptions/FLocalException.cs
@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace FLocal.Core {
+
+    partial class FLocalException : ApplicationException {
+
+        public readonly string FullStackTrace;
+
+        public FLocalException(string Message) : base(Message) {
+            this.FullStackTrace = Environment.StackTrace;
+        }
+
+        public string getMessage() {
+            return this.Message;
+        }
+
+        public override string StackTrace {
+            get {
+                return FullStackTrace;
+            }
+        }
+
+    }
+
+}
diff --git a/Core/exceptions/ObjectDoesntHaveAnIdException.cs b/Core/exceptions/ObjectDoesntHaveAnIdException.cs
new file mode 100644
index 0000000..3a53d21
--- /dev/null
+++ b/Core/exceptions/ObjectDoesntHaveAnIdException.cs
@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace FLocal.Core {
+
+    partial class ObjectDoesntHaveAnIdException : FLocalException {
+
+        public ObjectDoesntHaveAnIdException()
+            : base("Object doesn't have an id") {
+        }
+
+    }
+
+}
diff --git a/Core/extensions/Delegate.cs b/Core/extensions/Delegate.cs
new file mode 100644
index 0000000..52e3eb2
--- /dev/null
+++ b/Core/extensions/Delegate.cs
@@ -0,0 +1,47 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace FLocal.Core {
+    
+	static class DelegateExtension {
+
+        public static Func<T, bool> ToFunc<T>(this Predicate<T> p) {
+            return arg => p(arg);
+        }
+
+        public static Func<TResult> Curry<T1, TResult>(this Func<T1, TResult> func, T1 arg1) {
+            return () => func(arg1);
+        }
+
+        public static Action Curry<T1>(this Action<T1> action, T1 arg1) {
+            return () => action(arg1);
+        }
+
+        public static Func<TResult> Curry<T1, T2, TResult>(this Func<T1, T2, TResult> func, T1 arg1, T2 arg2) {
+            return () => func(arg1, arg2);
+        }
+
+        public static Action Curry<T1, T2>(this Action<T1, T2> action, T1 arg1, T2 arg2) {
+            return () => action(arg1, arg2);
+        }
+
+        public static Func<T2, TResult> LCurry<T1, T2, TResult>(this Func<T1, T2, TResult> func, T1 arg1) {
+            return arg2 => func(arg1, arg2);
+        }
+
+        public static Action<T2> LCurry<T1, T2>(this Action<T1, T2> action, T1 arg1) {
+            return arg2 => action(arg1, arg2);
+        }
+
+        public static Func<T1, TResult> RCurry<T1, T2, TResult>(this Func<T1, T2, TResult> func, T2 arg2) {
+            return arg1 => func(arg1, arg2);
+        }
+
+        public static Action<T1> RCurry<T1, T2>(this Action<T1, T2> action, T2 arg2) {
+            return arg1 => action(arg1, arg2);
+        }
+
+    }
+}
diff --git a/Core/extensions/Extensions.cs b/Core/extensions/Extensions.cs
new file mode 100644
index 0000000..700095d
--- /dev/null
+++ b/Core/extensions/Extensions.cs
@@ -0,0 +1,222 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace FLocal.Core {
+	
+	static class ExtensionMethods {
+
+        public static Dictionary<TKey, TValue> ToDictionary<TKey, TValue>(this IEnumerable<KeyValuePair<TKey, TValue>> kvps) {
+
+            Dictionary<TKey, TValue> res = new Dictionary<TKey,TValue>();
+            foreach(KeyValuePair<TKey, TValue> kvp in kvps) {
+                res[kvp.Key] = kvp.Value;
+            }
+            return res;
+        }
+
+        public static TDestinationDictionary
+            Convert<TSourceDictionary, TDestinationDictionary, TKey, TSource, TDestination>
+            (this TSourceDictionary dict, Func<TSource, TDestination> converter)
+            where TSourceDictionary : IDictionary<TKey, TSource>
+            where TDestinationDictionary : IDictionary<TKey, TDestination>, new()
+            {
+
+                TDestinationDictionary res = new TDestinationDictionary();
+                foreach(KeyValuePair<TKey, TSource> kvp in dict) {
+                    res[kvp.Key] = converter(kvp.Value);
+                }
+                return res;
+        }
+
+        public delegate TResult RefFunc<T, TResult>(ref T arg);
+
+        public static RefFunc<T, T> getProperty<T>(this object obj, Func<T> creator) {
+            return (ref T arg) => {
+                if(arg == null) {
+                    arg = creator();
+                }
+                return arg;
+            };
+        }
+
+        public static T getProperty<T>(this object obj, ref T arg, Func<T> creator) {
+            return obj.getProperty<T>(creator)(ref arg);
+        }
+
+        public static string ToPrintableString(this bool val) {
+            return val ? "Enabled" : "Disabled";
+        }
+
+        public static string ToXmlApiRequestString(this bool val) {
+            return val ? "1" : "0";
+        }
+
+        public static T Safe<T>(this T obj, T defaultValue) {
+            if(obj == null) {
+                return defaultValue;
+            } else {
+                return obj;
+            }
+        }
+
+        public static HashSet<T> Clone<T>(this HashSet<T> obj) {
+            return new HashSet<T>(obj);
+        }
+
+        /// <summary>
+        /// Note that actions from todoArr can be executed in any order!
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="obj"></param>
+        /// <param name="todoArr"></param>
+        /// <returns></returns>
+        public static T Tee<T>(this T obj, params Action<T>[] todoArr) {
+            foreach(Action<T> todo in todoArr) todo(obj);
+            return obj;
+        }
+
+        public static T Tee<T>(this T obj, Action todo) {
+            todo();
+            return obj;
+        }
+
+        private static List<TAttribute> GetAttributeArray<TAttribute>(this System.Reflection.PropertyInfo property) where TAttribute : Attribute {
+            return new List<TAttribute>(from attribute in property.GetCustomAttributes(true) where /*Tie(attribute, obj => Console.WriteLine(obj.GetType().FullName))*/ attribute is TAttribute select (TAttribute)attribute);
+        }
+
+        public static TAttribute GetAttribute<TAttribute>(this System.Reflection.PropertyInfo property) where TAttribute : Attribute {
+            return property.GetAttributeArray<TAttribute>().Single();
+        }
+
+        public static bool HasAttribute<TAttribute>(this System.Reflection.PropertyInfo property) where TAttribute : Attribute {
+            return property.GetAttributeArray<TAttribute>().Count > 0;
+        }
+
+        public static TResult Invoke<TResult>(this System.Reflection.MethodBase method, object obj, params object[] args) {
+            return (TResult)method.Invoke(obj, args);
+        }
+
+        public static void Invoke(this System.Reflection.MethodBase method, object obj, params object[] args) {
+            method.Invoke(obj, args);
+        }
+
+        public static Dictionary<TKey, TResult> Replace<TKey, TValue, TResult>(this IDictionary<TKey, TValue> dict, Func<TValue, TResult> Replacer) {
+            return new List<KeyValuePair<TKey, TResult>>(
+                from kvp in dict
+                select new KeyValuePair<TKey, TResult>(kvp.Key, Replacer(kvp.Value))
+            ).ToDictionary();
+        }
+
+        public static Dictionary<TKey, TValue> Replace<TKey, TValue>(this IDictionary<TKey, TValue> dict, Func<TValue, TValue> Replacer) {
+            return dict.Replace<TKey, TValue, TValue>(Replacer);
+        }
+
+        public static T Single<T>(this IEnumerable<T> list, Predicate<T> checker, Func<T> onNotFound) {
+            try {
+                return list.Single(checker.ToFunc());
+            } catch(InvalidOperationException) {
+                return onNotFound();
+            }
+        }
+
+        public static IEnumerable<string> Enquote(this IEnumerable<string> strings) {
+            return from str in strings select str.Enquote();
+        }
+
+        public static TResult Check<TSource, TResult>(this TSource obj, Predicate<TSource> checker, Func<TSource, TResult> returnOnFail, TResult returnOnSuccess) {
+            if(!checker(obj)) {
+                return returnOnFail(obj);
+            } else {
+                return returnOnSuccess;
+            }
+        }
+
+        public static TResult Check<TSource, TResult>(this TSource obj, Predicate<TSource> checker, Func<TSource, Exception> onFail, Func<TSource, TResult> returnOnSuccess) {
+            if(!checker(obj)) {
+                throw onFail(obj);
+            } else {
+                return returnOnSuccess(obj);
+            }
+        }
+        
+        public static void Check<T>(this T obj, Predicate<T> checker, Func<T, Exception> onFail) {
+            if(!checker(obj)) {
+                throw onFail(obj);
+            }
+        }
+
+        public static bool Empty<T>(this IEnumerable<T> list) {
+            return list.Count() == 0;
+        }
+
+        /// <summary>
+        /// Checks arg given against the predicate given; in case of type mismatch returns false
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="arg"></param>
+        /// <param name="checker"></param>
+        /// <returns></returns>
+        public static bool TypedLoosePredicate<T>(this object arg, Predicate<T> checker) {
+            return (arg is T) && checker((T)arg);
+        }
+
+        public static Func<object, string> SafeToStringConvertor() {
+            return obj => obj == null ? "" : obj.ToString();
+        }
+
+        public static T Recurse<T>(this T obj, Func<T, T> step, Predicate<T> checker) {
+            //Debugger.Debug("recurse(" + typeof(T).FullName + ")");
+            int i=0;
+            while(checker(obj)) {
+                //Debugger.Debug("Iteration " + i.ToString());
+                obj = step(obj);
+                i++;
+            }
+            //Debugger.Debug("endrecurse(" + typeof(T).Name + ")");
+            return obj;
+        }
+
+        public static T[] Slice<T>(this T[] obj, int offset, int length) {
+            if(offset<0) throw new IndexOutOfRangeException();
+            if(offset+length > obj.Length) throw new IndexOutOfRangeException();
+            T[] res = new T[length];
+            Array.Copy(obj, offset, res, 0, length);
+            return res;
+        }
+
+        public static T[] Slice<T>(this T[] arr, int offset) {
+            return arr.Slice(offset, arr.Length-offset);
+        }
+
+        public static T TryValues<T>(this T obj, params Func<T>[] trials) {
+            //Debugger.Debug("TryValues(" + typeof(T).FullName + ")");
+            return new KeyValuePair<T, Func<T>[]>(obj, trials).Recurse(
+                kvp => new KeyValuePair<T, Func<T>[]>(kvp.Value[0](), kvp.Value.Slice(1)),
+                kvp => !kvp.Value.Empty() && kvp.Key == null
+            ).Key;
+        }
+
+        public static IEnumerable<T> Replace<T>(this IEnumerable<T> list, Func<T, T> replacer) {
+            return from elem in list select replacer(elem);
+        }
+
+        public static string ToStringOnFail(this bool test, Lazy<string> onFail) {
+            return test ? "" : onFail();
+        }
+
+        public static string Join(this IEnumerable<string> strings, string separator) {
+            return String.Join(separator, strings.ToArray());
+        }
+
+        public static IEnumerable<T> GetSorted<T>(this IEnumerable<T> list) {
+            return from elem in list orderby elem select elem;
+        }
+
+        public static Int64 ToInt64(this decimal number) {
+            return decimal.ToInt64(number);
+        }
+
+    }
+}
diff --git a/Core/extensions/String.cs b/Core/extensions/String.cs
new file mode 100644
index 0000000..c52273e
--- /dev/null
+++ b/Core/extensions/String.cs
@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace FLocal.Core {
+
+	static class StringExtension {
+
+        public static string PHPSubstring(this string str, int start, int length) {
+            if(start > str.Length) {
+                return "";
+            } else if(start + length > str.Length) {
+                return str.Substring(start);
+            } else {
+                return str.Substring(start, length);
+            }
+        }
+
+        public static string PHPSubstring(this string str, int start) {
+            if(start > str.Length) {
+                return "";
+            } else {
+                return str.Substring(start);
+            }
+        }
+
+        public static string Enquote(this string str, string quotationMark) {
+            return quotationMark + str + quotationMark;
+        }
+
+        public static string Enquote(this string str) {
+            return str.Enquote("'");
+        }
+
+        public static string Replace(this string src, IEnumerable<KeyValuePair<string, string>> replacePairs) {
+            string dest = src;
+            foreach(KeyValuePair<string, string> kvp in replacePairs) {
+                dest = dest.Replace(kvp.Key, kvp.Value);
+            }
+            return dest;
+        }
+
+        public static bool Contains(this string str, IEnumerable<string> needles) {
+            return (from needle in needles select str.Contains(needle)).Contains(true);
+        }
+
+        public static bool IContains(this string str, IEnumerable<string> needles) {
+            return str.ToLower().Contains(from needle in needles select needle.ToLower());
+        }
+
+    }
+}