Full Example

While Loop Example Program:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication10

{

    class Program

    {

        static void Main(string[] args)

        {

            Console.WriteLine("Enter the number to generate");

            int UserTarget = int.Parse(Console.ReadLine());

            int Start = 0;

            while (Start <= UserTarget)

            {

                Console.WriteLine(Start);

                Start += 2; //Start = Start + 2;

            }

        }

    }

}

2.do While loop Example Program:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication10

{

    class Program

    {

        static void Main(string[] args)

        {

            String UserChoice = "";

            do

            {

                Console.WriteLine("Enter the number to generate");

                int UserTarget = Convert.ToInt32(Console.ReadLine());

                int Start = 0;

                while (Start <= UserTarget)

                {

                    Console.WriteLine(Start);

                    Start += 2; //Start = Start + 2;

                }

                Console.WriteLine("Do you want to continue-'Yes' or 'No'");

                UserChoice = (Console.ReadLine().ToUpper());

                if (UserChoice != "YES" && UserChoice != "NO")

                {

                    Console.WriteLine("Invalid Operation!");

                    Console.WriteLine("Enter 'Yes' or 'No'");

                }

            } while (UserChoice == "YES");

            Console.WriteLine("Thank You!");

        }

    }

}

3.Example while loop program with using array:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication10

{

    class Program

    {

        static void Main(string[] args)

        {

            int[] Numbers = new int[3];

            Numbers[0] = 101;

            Numbers[1] = 102;

            Numbers[2] = 102;

           

            int i=0;

            while(i<Numbers.Length)

            {

                Console.WriteLine(Numbers[i]);

                i++;

            }

        }

    }

}

Operator overloading Example program:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication10

{

    class Box

    {

        private double length;

        private double breadth;

        private double height;

        public double getLength()

        {

            return length * breadth * height;

        }

        public void setLength(double len)

        {

            length = len;

        }

        public void setBreadth(double bre)

        {

            breadth = bre;

        }

        public void setHeight(double hei)

        {

            height = hei;

        }

        public static Box operator +(Box b, Box c)

        {

            Box box = new Box();

            box.length = b.length + c.length;

            box.breadth = b.breadth + c.breadth;

            box.height = b.height + c.height;

            return box;

        }

    }

    class Program

    {

        static void Main(string[] args)

        {

            Box Box1 = new Box();

            Box Box2 = new Box();

            Box Box3 = new Box();

            double volume = 0.0;

            Box1.setBreadth(6.0);

            Box1.setHeight(7.0);

            Box1.setLength(8.0);

            Box2.setBreadth(12.0);

            Box2.setHeight(13.0);

            Box3.setLength(14.0);

            volume = Box1.getLength();

            Console.WriteLine("the box1 value is:{0}", volume);

            volume = Box2.getLength();

            Console.WriteLine("the box2 value is:{0}", volume);

            Box3 = Box1 + Box2;

            volume = Box3.getLength();

            Console.WriteLine("the box3 value is:{0}", volume);

            Console.ReadKey();

          

        }

    }

}

Split string example program:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Text.RegularExpressions;

namespace ConsoleApplication10

{

   

    class Program

    {

        static void Main(string[] args)

        {

            string siva = "abc,def,ghi,j";

            string[] buff = siva.Split(',');

            //Console.WriteLine(buff.Length-1);

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

            {

                Console.WriteLine(buff[i]);

            }

            //foreach (string s in buff)

            //{

            //    Console.WriteLine(s);

            //    //Console.ReadKey();

            //}

            //string str = "1111222233334444";

            //MatchCollection mc = Regex.Matches(str, @"\w{3}");

            //for (int i = 0; i < mc.Count; i++)

            //{

            //    Console.WriteLine("--" + mc[i].Value + "--");

            //    Console.ReadKey();

            //}

           

        }

    }

}

Switch on off program:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication13

{

   

    class Program

    {

        static void Main(string[] args)

        {

        

            string y;

            do{

                Console.WriteLine("siva");

                    do

                    {

                       // Console.WriteLine("do u want 'on' or'off'");

                        y = (Console.ReadLine());

                        //if(y=="on")

                       // Console.WriteLine("the switch is already on condition");

                    } while (y == "on");

                    do

                    {

                        //Console.WriteLine("do u want to 'on' or 'off'");

                        y = (Console.ReadLine());

                        //if(y=="off")

                       // Console.WriteLine("the switch is already off condition");

                    } while (y == "off");

               

            } while (y == "on");

        }

    }

}

File retrieve and edit and update in window.

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.IO;

namespace openfile_and_savefile

{

    public partial class Form1 : Form

    {

       

        public Form1()

        {

            InitializeComponent();

        }

       

        private void textBox1_TextChanged(object sender, EventArgs e)

        {

        }

        private void Open_Click_1(object sender, EventArgs e)

        {

            if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)

            {

                label1.Text = openFileDialog1.FileName;

                textBox1.Text = File.ReadAllText(label1.Text);

            }

        }

        private void Save_Click(object sender, EventArgs e)

        {

            if (saveFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)

            {

                File.WriteAllText(saveFileDialog1.FileName, textBox1.Text);

            }

        }

    }

}

//using tools--->

//--All windows forms:

//1.open button.

//2.save button.

//3.Textbox-->Multiline;

//--Dialogs:

//1.OpenFileDialog

//2.saveFileDialog

Simple mail sending program:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Net.Mail;

public partial class Sending_mail : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

    }

    protected void TextBox3_TextChanged(object sender, EventArgs e)

    {

    }

    protected void TextBox1_TextChanged(object sender, EventArgs e)

    {

    }

  

    protected void Button2_Click(object sender, EventArgs e)

    {

        MailMessage mail = new MailMessage();

        SmtpClient SmtpServer = new SmtpClient();

        mail.From = new MailAddress("javaatmind@gmail.com");

        mail.To.Add(TextBox1.Text);

        mail.Subject = TextBox2.Text;

        mail.Body = TextBox3.Text;

        mail.IsBodyHtml = true;

        SmtpServer.Host = "smtp.gmail.com";

        SmtpServer.Port = 587;

        System.Net.NetworkCredential Networkcred = new System.Net.NetworkCredential();

        Networkcred.UserName = "javaatmind@gmail.com";

        Networkcred.Password = "vinayagasiva.";

        SmtpServer.UseDefaultCredentials = true;

        SmtpServer.Credentials = Networkcred;

        SmtpServer.EnableSsl = true;

       

  

        SmtpServer.Send(mail);

        Label5.Text = "Message send successfully";

    }

}

//note:

//https://www.google.com/settings/security/lesssecureapps

//goto to this link and to activate less secure apps turn on.

Random Number generator program:

protected void Button1_Click1(object sender, EventArgs e)

    {

        Random rad = new Random();

        Label3.Text = rad.Next(500, 600).ToString();

        var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

        var stringChars = new char[5];

        Random random = new Random();

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

        {

            stringChars[i] = chars[random.Next(chars.Length)];

        }

        var finalString = new String(stringChars);

        Console.WriteLine(finalString.ToUpper());

        //final output generate number

        Label3.Text = finalString.ToUpper();

}

Stored Procedure:

Button_click

{

con.Open();

        SqlCommand cmd = new SqlCommand("PatientReg"àstore procedure name, con);

        cmd.CommandType = CommandType.StoredProcedure;

        SqlParameter p1 = new SqlParameter("", finalString.ToUpper());

        cmd.Parameters.Add(p1);

}