C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;
using System.Globalization;

namespace Computer_system
{


    public partial class Form1 : Form
    {
        private RemoteSysInformation.SystemInformation sysinfo;

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (sysinfo.Get("textBox4.text") != 0)
            {
                MessageBox.Show("Error getting system information.", "System Information");
            }
            else
            {



                textBox3.Text = ("" + Computer_system.win32_computer_system.GetDomain());
                textBox2.Text = ("" + Computer_system.win32_computer_system.GetUserName());
                textBox1.Text = ("" + Computer_system.win32_computer_system.GetPSComputerName());
                textBox5.Text = ("" + Computer_system.win32_computer_system.GetManufacturer());
                textBox6.Text = ("" + Computer_system.win32_computer_system.GetModel());
                listBox1.Text = ("" + Computer_system.win32_printer.GetName());

            }
        }

        private void button4_Click(object sender, EventArgs e)
        {

            // Execute command with arguments in Dos command line
            Process.Start("Cmd.exe", @"/C mstsc.exe /v:");
            //  /C parameter means exiting Cmd.exe after executing command

        }

        private void button2_Click(object sender, EventArgs e)
        {
            // Execute command with arguments in Dos command line
            Process.Start("Cmd.exe", @"/C RC.exe 1");
            //  /C parameter means exiting Cmd.exe after executing command
        }

        private void button3_Click(object sender, EventArgs e)
        {
            // Execute command with arguments in Dos command line
            Process.Start("Cmd.exe", @"/C MSRA.exe /OfferRA");
            //  /C parameter means exiting Cmd.exe after executing command
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }


    }
}

sysinfo = new SysInfo();

1. Your subject-line does not give me a clue about the problem;
   
2. Don't post your mail-address unless you "need" spam
   
3. "Does not work" doesn't explain anything. Include the full error-message
   
4. Read up on the Dispose-method
   

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
They hate us for our freedom![^]