C#

myDll.h

#ifndef _MYDLL_H
#define _MYDLL_H

extern "C" _declspec(dllexport)  char* __stdcall getName();

#endif 

myDll.cpp

#include "stdafx.h"

#include "mydll.h"

extern "C" __declspec(dllexport) char* __stdcall getName()
{
	return "Hello !!!";
}

using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace sysWinApp
{
    public partial class Form1 : Form
    {
        [DllImport("myDll.dll")]
        static extern string getName();

        
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            label1.Text = getName();
        }
    }
}

//this variable indicates the current language in use
    CultureInfo CurrentLocale;

    public Form1()
    {
        InitializeComponent();
        valueInit();
        //MessageBox.Show(rfidCard.PORT + "");
    }


    //Lets start adding the multilingual code here




    //change the language in real time 
    private void ChangeLanguage(string lang)
    {
        CurrentLocale = new CultureInfo(lang);
        foreach (Control c in this.Controls)
        {
            ComponentResourceManager resources = new ComponentResourceManager(typeof(Form1));
            resources.ApplyResources(c, "$this");
            RefreshResources(this, resources);
        }
    }

    //refresh all the controls e sub-controls of the form 
    private void RefreshResources(Control ctrl, ComponentResourceManager res)
    {
        ctrl.SuspendLayout();
        res.ApplyResources(ctrl, ctrl.Name, CurrentLocale);
        foreach (Control control in ctrl.Controls)
            RefreshResources(control, res); // recursion
        ctrl.ResumeLayout(false);
    }

    private void englishToolStripMenuItem_Click(object sender, EventArgs e)
    {
        ChangeLanguage("en-US");
    }

    private void arabicToolStripMenuItem_Click(object sender, EventArgs e)
    {
        ChangeLanguage("ar-SA");
    }

    private void koreanToolStripMenuItem_Click(object sender, EventArgs e)
    {
        ChangeLanguage("ko-KR");
    }

    // the code ends here

gr.DrawImageUnscaledAndClipped(img, rect);

private void button3_Click(object sender, EventArgs e)
        {
            
            SqlCeCommand cu = new SqlCeCommand("UPDATE tblUsers SET userName = @userName, age = @age WHERE userName = @userName", cn);
            
            cu.Parameters.AddWithValue("@userName", textBox1.Text);
            cu.Parameters.AddWithValue("@age", textBox2.Text);
            try
            {
                cu.ExecuteNonQuery();
                Populate();//function only to refresh listview with select command 

            }
            catch (SqlCeException excd)
            { MessageBox.Show(excd.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error); }
        }