Graphics

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.Drawing;

namespace WindowsFormsApplication1

{

    public partial class graphics : Form

    {

        public graphics()

        {

            InitializeComponent();

        }

        private void graphics_Load(object sender, EventArgs e)

        {

        }

        private void graphics_Paint(object sender, PaintEventArgs e)

        {

            Graphics g;

            g = this.CreateGraphics();

            Pen p = new Pen(Brushes.Purple, 3);

            g.DrawEllipse(p, 100, 100, 100, 100);

            g.FillEllipse(Brushes.Plum, 200, 100, 100, 200);

            g.DrawLine(p, new Point(100, 200), new Point(200, 100));

            Point[] p1 = new Point[5];

            p1[0] = new Point(100, 50);

            p1[1] = new Point(200, 100);

            p1[2] = new Point(250, 100);

            p1[3] = new Point(200, 50);

            p1[4] = new Point(100, 250);

            g.DrawPolygon(p, p1);

            System.Drawing.Font f = new Font("Times New Roman", 15, FontStyle.Bold);

            StringFormat f1 = new StringFormat(StringFormatFlags.NoClip);

            StringFormat f2 = new StringFormat(f1);

            f1.LineAlignment = StringAlignment.Center;

            f2.FormatFlags = StringFormatFlags.DirectionVertical;

            f2.Alignment = StringAlignment.Far;

            Rectangle r=new Rectangle(100,100,100,100);

            g.DrawRectangle(Pens.Brown, r);

            g.DrawString("Hello world", f, Brushes.Red, r.X, r.Y, f1);

            g.DrawString("Hai", f, Brushes.SlateBlue, r.Left, r.Top, f2);

        }

    }

}

Windows management Instrumentation

WMI is a set of extensions to the windows drives model that provides an opertaing system interface through which instrumental components provide information and notification.Microsoft also provides a command line interface to WMI called Windows Management Instrumentation Command Line(WMIC)

Win32-Operating System

            CSName,Caption,Windows directory,serialno,registered user,no of processes

Win32-Bios

Version,name,manufacturer,serialnumber,release date,current language,primary bios,status

            Win32-ComputerSystem

                        Manufacturer,username,totalphysicalmemory,system type,model

            Win32-Processor

                        Caption,Current Clock Speed

            Win32-TimeZone

                        Caption

            Win32-CDROMDrive

                        Caption,mediatype,drive,manufacturer,description

            Win32-Account

                        Name,description,domain,sid

            Win32-DiskDrive

                        Caption,deviceid,index,partitions

            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.Management;

namespace WindowsFormsApplication1

{

    public partial class WMI : Form

    {

        public WMI()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            SelectQuery query = new SelectQuery("Win32OperatingSystem");

            ManagementObjectSearcher search = new ManagementObjectSearcher(query);

            foreach (ManagementObject mobj in search.Get())

            {

                MessageBox.Show(mobj["CSname"].ToString());

            }

        }

        private void WMI_Load(object sender, EventArgs e)

        {

        }

    }

}

COM in c#

Com: =Microsoft Shell Controls and Automation

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 Shell32;

namespace WindowsFormsApplication1

{

    public partial class com : Form

    {

        public com()

        {

            InitializeComponent();

        }

        private void com_Load(object sender, EventArgs e)

        {

        }

        ShellClass sc = new ShellClass();

        private void button1_Click(object sender, EventArgs e)

        {

            sc.ShutdownWindows();

        }

        private void button2_Click(object sender, EventArgs e)

        {

            sc.RefreshMenu();

        }

        private void button4_Click(object sender, EventArgs e)

        {

            sc.SetTime();

          

        }

        private void button5_Click(object sender, EventArgs e)

        {

            sc.FindComputer();

            sc.FindFiles();

            sc.FileRun();

            sc.Help();

            sc.MinimizeAll();

            sc.ControlPanelItem("C://");

            sc.EjectPC();

            sc.GetHashCode();

            sc.Windows();

            sc.Suspend();

            sc.UndoMinimizeALL();

            sc.TrayProperties();

        }

    }

}

Calculator with Stack

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;

namespace WindowsFormsApplication1

{

    public partial class calc : Form

    {

        public calc()

        {

            InitializeComponent();

        }

        Stack<int> st = new Stack<int>();

        private void button1_Click(object sender, EventArgs e)

        {

            string[] ar = new string[100];

            string fg = textBox1.Text;

            ar = fg.Split('+');

            int total = 0;

            for (int i = 0; i < ar.Length; i++)

            {

                st.Push(Convert.ToInt32(ar[i].ToString()));

                listBox1.Items.Add(ar[i].ToString());

            }

            MessageBox.Show(st.Count.ToString());

            for (int i = st.Count; i > 0; i--)

            {

                int s = st.Pop();

                total = total + s;

            }

            MessageBox.Show(Convert.ToString(total));

        }

    }

}

Queue(Enqueue and Dequeue)

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;

namespace WindowsFormsApplication1

{

    public partial class queue : Form

    {

        public queue()

        {

            InitializeComponent();

        }

        Queue<string> qu = new Queue<string>();

        private void btnen_Click(object sender, EventArgs e)

        {

            qu.Enqueue(textBox1.Text);

            listBox1.Items.Add(textBox1.Text);

            textBox1.Text = "";

        }

        private void btnde_Click(object sender, EventArgs e)

        {

            listBox1.Items.RemoveAt(0);

            listBox1.Refresh();

        }

    }

}

Stack(Push and Pop)

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;

namespace WindowsFormsApplication1

{

    public partial class stack : Form

    {

        public stack()

        {

            InitializeComponent();

        }

        Stack<int> st = new Stack<int>();

        private void btnpush_Click(object sender, EventArgs e)

        {

            st.Push(Convert.ToInt32(textBox1.Text));

            listBox1.Items.Add(textBox1.Text);

            textBox1.Text = "";

        }

        private void btnpop_Click(object sender, EventArgs e)

        {

            int i = st.Pop();

            MessageBox.Show(i + "is poped");

            int k = st.Count;

            listBox1.Items.RemoveAt(k);

            listBox1.Refresh();

        }

    }

}