diff --git a/src/Mono/Assembly.cpp b/src/Mono/Assembly.cpp
new file mode 100644
index 0000000..9a5cb8a
--- /dev/null
+++ b/src/Mono/Assembly.cpp
@@ -0,0 +1,23 @@
+#include "Mono.hpp"
+
+namespace Mono {
+
+Assembly::Assembly(MonoAssembly *ptr)
+    : ptr(ptr), image(mono_assembly_get_image(ptr))
+{
+}
+
+Assembly::~Assembly(){
+    // Tt causes SEGFAULT.
+    // Is it even possible to unload assembly from domain?
+    // mono_assembly_close(ptr);
+}
+
+std::shared_ptr<Class> Assembly::getClass(const std::string &name_space, const std::string &name){
+    MonoClass* ptr = mono_class_from_name(image, name_space.c_str(), name.c_str());
+    if(!ptr)
+        throw UsefulException(format("can't find class '%s.%s'", name_space.c_str(), name.c_str()));
+    return std::make_shared<Class>(ptr, name_space, name);
+}
+
+}
diff --git a/src/Mono/Class.cpp b/src/Mono/Class.cpp
new file mode 100644
index 0000000..e2225cc
--- /dev/null
+++ b/src/Mono/Class.cpp
@@ -0,0 +1,33 @@
+#include "Mono.hpp"
+
+namespace Mono {
+
+Class::Class(MonoClass *ptr, const std::string& name_space, const std::string& name)
+    : ptr(ptr), name_space(name_space), name(name)
+{
+    void* iter = nullptr;
+    MonoMethod* m = nullptr;
+    while( (m = mono_class_get_methods(ptr, &iter)) ){
+        auto name = std::string_view(mono_method_get_name(m));
+        methods.emplace(std::piecewise_construct,
+            std::forward_as_tuple(name),
+            std::forward_as_tuple(m, name));
+    }
+}
+
+
+template<>
+void* _valueToVoidPtr<Object>(Object& v){ return v; }
+template<>
+void* _valueToVoidPtr<String>(String& v){ return v; }
+
+template<>
+Object _valueFromMonoObject<Object>(MonoObject* o){
+    return (Object)o;
+}
+template<>
+String _valueFromMonoObject<String>(MonoObject* o){
+    return (String)((void*)o);
+}
+
+}
diff --git a/src/Mono/Method.cpp b/src/Mono/Method.cpp
new file mode 100644
index 0000000..d55714c
--- /dev/null
+++ b/src/Mono/Method.cpp
@@ -0,0 +1,16 @@
+#include "Mono.hpp"
+
+namespace Mono {
+
+Method::Method(MonoMethod *ptr, const std::string_view& name)
+    : ptr(ptr), signature(mono_method_signature(ptr)), name(name)
+{
+    void* iter = nullptr;
+    return_type = mono_signature_get_return_type(signature);
+    MonoType* pt = nullptr;
+    while( (pt = mono_signature_get_params(signature, &iter)) ){
+        argument_types.push_back(pt);
+    }
+}
+
+}
diff --git a/src/Mono/Mono.cpp b/src/Mono/Mono.cpp
index 3fe21f2..0a7b0eb 100644
--- a/src/Mono/Mono.cpp
+++ b/src/Mono/Mono.cpp
@@ -1,80 +1,22 @@
 #include "Mono.hpp"
-#include "../UsefulException.hpp"
-#include "../format.hpp"
-#include <mono/jit/jit.h>
-#include <mono/metadata/mono-config.h>
-#include <mono/metadata/debug-helpers.h>
-#include <iostream>
+#include <mono/metadata/appdomain.h>
 
 namespace Mono {
 
-RuntimeJIT::RuntimeJIT(const std::string& domain_name){
-    mono_set_dirs("mono-libs", "mono-libs");
-    mono_set_assemblies_path("mono-libs");
-    mono_config_parse("mono-libs/config.xml");
+template <> MonoClass* getClass<SByte>(){ return mono_get_sbyte_class(); }
+template <> MonoClass* getClass<Byte>(){ return mono_get_byte_class(); }
+template <> MonoClass* getClass<Short>(){ return mono_get_int16_class(); }
+template <> MonoClass* getClass<UShort>(){ return mono_get_uint16_class(); }
+template <> MonoClass* getClass<Int>(){ return mono_get_int32_class(); }
+template <> MonoClass* getClass<UInt>(){ return mono_get_uint32_class(); }
+template <> MonoClass* getClass<Long>(){ return mono_get_int64_class(); }
+template <> MonoClass* getClass<ULong>(){ return mono_get_uint64_class(); }
+template <> MonoClass* getClass<Float>(){ return mono_get_single_class(); }
+template <> MonoClass* getClass<Double>(){ return mono_get_double_class(); }
+template <> MonoClass* getClass<Bool>(){ return mono_get_boolean_class(); }
+template <> MonoClass* getClass<Char>(){ return mono_get_char_class(); }
+template <> MonoClass* getClass<String>(){ return mono_get_string_class(); }
+template <> MonoClass* getClass<Object>(){ return mono_get_object_class(); }
+template <> MonoClass* getClass<Void>(){ return mono_get_void_class(); }
 
-    domain = mono_jit_init(domain_name.c_str());
-    if(!domain)
-        throw UsefulException("can't initialize mono domain");
 }
-
-RuntimeJIT::~RuntimeJIT(){
-    mono_jit_cleanup(domain);
-}
-
-std::shared_ptr<Assembly> RuntimeJIT::loadAssembly(const std::string &name){
-    MonoAssembly* ptr = mono_domain_assembly_open(domain, "app.exe");
-    if(!ptr)
-        throw UsefulException(format("can't load assembly '%s'", name.c_str()));
-    return std::make_shared<Assembly>(ptr);
-}
-
-Assembly::Assembly(MonoAssembly *ptr)
-    : ptr(ptr), image(mono_assembly_get_image(ptr))
-{
-}
-
-Assembly::~Assembly(){
-    // Tt causes SEGFAULT.
-    // Is it even possible to unload assembly from domain?
-    // mono_assembly_close(ptr);
-}
-
-std::shared_ptr<Class> Assembly::getClass(const std::string &name_space, const std::string &name){
-    MonoClass* ptr = mono_class_from_name(image, name_space.c_str(), name.c_str());
-    if(!ptr)
-        throw UsefulException(format("can't find class '%s.%s'", name_space.c_str(), name.c_str()));
-    return std::make_shared<Class>(ptr);
-}
-
-Class::Class(MonoClass *ptr)
-    : ptr(ptr)
-{
-    void* iter = nullptr;
-    MonoMethod* m = nullptr;
-    while( (m = mono_class_get_methods(ptr, &iter)) ){
-        auto name = std::string_view(mono_method_get_name(m));
-        methods.emplace(std::piecewise_construct,
-            std::forward_as_tuple(name),
-            std::forward_as_tuple(name, m));
-    }
-}
-
-template<typename ReturnT, typename... ArgTypes>
-std::shared_ptr<std::function<ReturnT(ArgTypes...)>> getMethod(const std::string& name){
-    
-    return std::make_shared<std::function<ReturnT(ArgTypes...)>>();
-}
-
-Method::Method(const std::string_view &name, MonoMethod *ptr)
-    : ptr(ptr), signature(mono_method_signature(ptr)), name(name)
-{
-    void* iter = nullptr;
-    MonoType* rt = mono_signature_get_return_type(signature);
-    MonoType* pt = nullptr;
-    while( (pt = mono_signature_get_params(signature, &iter)) ){
-        std::cout<<"name: "<<mono_type_get_name(pt)<<std::endl;
-    }
-}
-
-} // namespace Mono
diff --git a/src/Mono/Mono.hpp b/src/Mono/Mono.hpp
index 809d6b1..44f01c2 100644
--- a/src/Mono/Mono.hpp
+++ b/src/Mono/Mono.hpp
@@ -1,5 +1,7 @@
 #pragma once
 #include "../std.hpp"
+#include "../UsefulException.hpp"
+#include "../format.hpp"
 #include <memory>
 #include <string>
 #include <functional>
@@ -16,34 +18,105 @@ typedef u8 Byte;
 typedef i16 Short;
 typedef u16 UShort;
 typedef i32 Int;
-typedef i32 UInt;
+typedef u32 UInt;
 typedef i64 Long;
-typedef i64 ULong;
+typedef u64 ULong;
 typedef f32 Float;
 typedef f64 Double;
+typedef union { mono_bool wide_bool; } Bool; //USAGE: Bool t = {true};
+typedef char16_t Char;
 typedef MonoString* String;
+typedef MonoObject* Object;
+typedef void Void;
+template<typename PrimitiveT>
+MonoClass* getClass(); 
 
 class Method {
+public:
     MonoMethod* ptr;
     MonoMethodSignature* signature;
-
-public:
     const std::string_view name;
-    Method(const std::string_view& name, MonoMethod* ptr);
+    MonoType* return_type;
+    std::vector<MonoType*> argument_types;
+
+    Method(MonoMethod* ptr, const std::string_view& name);
 };
 
+
+template<typename T>
+void* _valueToVoidPtr(T& v){
+    return &v;
+}
+template<typename T>
+T _valueFromMonoObject(MonoObject* o){
+    void* result_value_ptr = mono_object_unbox(o);
+    if(result_value_ptr == nullptr)
+        throw UsefulException("can't unbox method value");
+    return *((T*)result_value_ptr);
+}
+
 class Class {
-    std::multimap<std::string_view, Method> methods;
-    MonoClass* ptr;
 
 public:
-    Class(MonoClass* ptr);
+    std::multimap<std::string_view, Method> methods;
+    MonoClass* ptr;
+    const std::string name_space;
+    const std::string name;
+
+    Class(MonoClass* ptr, const std::string& name_space, const std::string& name);
     Class(const Class&) = delete;
     
+    /// @brief all types must have template implementation of getClass<T>()
+    /// @tparam ReturnT return type
+    /// @tparam ...ArgTypes argument types
+    /// @return function which takes arguments and returns value of ReturnT
     template<typename ReturnT, typename... ArgTypes>
-    std::shared_ptr<std::function<ReturnT(ArgTypes...)>> getMethod(const std::string& name);
+    std::shared_ptr<std::function<ReturnT(MonoObject*, ArgTypes...)>> getMethod(const std::string& name){
+        Method* m = nullptr;
+        static std::vector<MonoClass*> arg_classes { getClass<ArgTypes>()... };
+        // iterate each method overload
+        for(auto it = methods.find(name); it != methods.end(); it++){
+            m = &it->second;
+            // compare argument count
+            if(m->argument_types.size() != arg_classes.size())
+                continue;
+            // compare return type
+            if(!mono_metadata_type_equal(m->return_type, mono_class_get_type(getClass<ReturnT>())))
+                continue;
+            // compare argument types
+            bool argument_types_mismatch = false;
+            for(size_t i = 0; i < arg_classes.size(); i++){
+                if(!mono_metadata_type_equal(m->argument_types[i], mono_class_get_type(arg_classes[i]))){
+                    argument_types_mismatch = true;
+                    break;
+                }
+            }
+            if(argument_types_mismatch)
+                continue;
+            // passed all tests successfully
+            break;
+        }
+
+        // if method not found throw exception
+        if(m == nullptr)
+            throw UsefulException(format("can't get method '%s' from class '%s'",
+                name.c_str(), this->name.c_str()));
+
+        MonoMethod* m_ptr = m->ptr;
+        return std::make_shared<std::function<ReturnT(MonoObject*, ArgTypes...)>>(
+            [m_ptr](MonoObject* class_instance, ArgTypes... args) -> ReturnT 
+            {
+                void* arg_array[] = { _valueToVoidPtr(args)..., nullptr };
+                // MonoException* ex = nullptr;
+                // TODO: exception catch
+                MonoObject* result = mono_runtime_invoke(m_ptr, class_instance, arg_array, nullptr);
+                return _valueFromMonoObject<ReturnT>(result);
+            }
+        );
+    }
 };
 
+
 class Assembly {
     MonoAssembly* ptr;
     MonoImage* image;
@@ -69,4 +142,4 @@ public:
     std::shared_ptr<Assembly> loadAssembly(const std::string& name);
 };
 
-}
+} // namespace Mono
diff --git a/src/Mono/Runtime.cpp b/src/Mono/Runtime.cpp
new file mode 100644
index 0000000..a85ebdf
--- /dev/null
+++ b/src/Mono/Runtime.cpp
@@ -0,0 +1,28 @@
+#include "Mono.hpp"
+#include <mono/jit/jit.h>
+#include <mono/metadata/mono-config.h>
+
+namespace Mono {
+
+RuntimeJIT::RuntimeJIT(const std::string& domain_name){
+    mono_set_dirs("mono-libs", "mono-libs");
+    mono_set_assemblies_path("mono-libs");
+    mono_config_parse("mono-libs/config.xml");
+
+    domain = mono_jit_init(domain_name.c_str());
+    if(!domain)
+        throw UsefulException("can't initialize mono domain");
+}
+
+RuntimeJIT::~RuntimeJIT(){
+    mono_jit_cleanup(domain);
+}
+
+std::shared_ptr<Assembly> RuntimeJIT::loadAssembly(const std::string &name){
+    MonoAssembly* ptr = mono_domain_assembly_open(domain, "app.exe");
+    if(!ptr)
+        throw UsefulException(format("can't load assembly '%s'", name.c_str()));
+    return std::make_shared<Assembly>(ptr);
+}
+
+}
diff --git a/src/main.cpp b/src/main.cpp
index d4be044..a69f8e8 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -15,12 +15,19 @@ void update(f64 deltaTime){
 
 int main(int argc, const char** argv){
     try {
-        Resources::init();
-        std::cout<<"initialized resource loader"<<std::endl;
+        // Resources::init();
+        // std::cout<<"initialized resource loader"<<std::endl;
+        
         Mono::RuntimeJIT mono;
         auto a = mono.loadAssembly("app.exe");
         auto c = a->getClass("", "A");
+        auto m = c->getMethod<Mono::Int, Mono::Byte, Mono::Float>("Method");
+        std::cout<<"method has been found"<<std::endl;
+        Mono::Int r = m->operator()(nullptr, 16, 0.32);
+        std::cout<<"result: "<<r<<std::endl;
+        return 0;
         std::cout<<"initialized mono jit runtime"<<std::endl;
+
         GUI::MainWindow w;
         w.open("ougge", update);
         std::cout<<"created sdl window"<<std::endl;