C# / Csharp.Net Tutorials

C# / Csharp datatable to xml example

admin — Fri, 15 Jul 2011 06:27:51 +0000

A simple example in csharp / C# to save datatable to xml format.
DataTable to xml example

using System;
using System.Data;

public class DataTableToXmlExample
{
    public static void Main()
    {
        //adding up a new datatable
        DataTable dtEmployee = new DataTable("Employee"); 

        //adding up 3 columns to datatable
        dtEmployee.Columns.Add("ID", typeof(int));
        dtEmployee.Columns.Add("Name", typeof(string));
        dtEmployee.Columns.Add("Salary", typeof(double));

        //adding up rows to the datatable
        dtEmployee.Rows.Add(52, "Human1", 21000);
        dtEmployee.Rows.Add(63, "Human2", 22000);
        dtEmployee.Rows.Add(72, "Human3", 23000);
        dtEmployee.Rows.Add(110,"Human4", 24000);

         //this will save the datatable into employee.xml file
        dtEmployee.WriteXml(@"C:\Test\Employee.xml");

        Console.WriteLine("File saved in xml format!");

        Console.ReadLine();
    }

}

Csharp / C# DataTable sort example

admin — Thu, 14 Jul 2011 13:37:25 +0000

A quick sort on a datatable using C# / Csharp.

DataTable sort example

using System;
using System.Data;

public class DataTableSortExample
{
    public static void Main()
    {
        //adding up a new datatable
        DataTable dtEmployee = new DataTable("Employee"); 

        //adding up 3 columns to datatable
        dtEmployee.Columns.Add("ID", typeof(int));
        dtEmployee.Columns.Add("Name", typeof(string));
        dtEmployee.Columns.Add("Salary", typeof(double));

        //adding up rows to the datatable
        dtEmployee.Rows.Add(52, "Human1", 21000);
        dtEmployee.Rows.Add(63, "Human2", 22000);
        dtEmployee.Rows.Add(72, "Human3", 23000);
        dtEmployee.Rows.Add(110,"Human4", 24000);

        // sorting the datatable basedon salary in descending order
        DataRow[] rows=  dtEmployee.Select(string.Empty,"Salary desc");

        //foreach datatable
        foreach (DataRow row in rows)
        {
Console.WriteLine(row["ID"].ToString() + ":" + row["Name"].ToString() + ":" + row["Salary"].ToString());
        }

        Console.ReadLine();
    }

}

Output:
110:Human4:24000
72:Human3:23000
63:Human2:22000
52:Human1:21000

Csharp / C# DataTable Compute example

admin — Thu, 14 Jul 2011 13:20:54 +0000

Quickly understand the use of compute in datatable.
DataTable Compute Example

using System;
using System.Data;

public class DataTableComputeExample
{
    public static void Main()
    {
        //adding up a new datatable
        DataTable dtEmployee = new DataTable("Employee"); 

        //adding up 3 columns to datatable
        dtEmployee.Columns.Add("ID", typeof(int));
        dtEmployee.Columns.Add("Name", typeof(string));
        dtEmployee.Columns.Add("Salary", typeof(double));

        //adding up rows to the datatable
        dtEmployee.Rows.Add(52, "Human1", 21000);
        dtEmployee.Rows.Add(63, "Human2", 22000);
        dtEmployee.Rows.Add(72, "Human3", 23000);
        dtEmployee.Rows.Add(110,"Human4", 24000);

        Console.Write("Employee Count:");
        Console.WriteLine(dtEmployee.Compute("Count(ID)", string.Empty));

        Console.Write("Maximum Salary:");
        Console.WriteLine(dtEmployee.Compute("Max(Salary)",string.Empty));

        Console.Write("Minimum Salary:");
        Console.WriteLine(dtEmployee.Compute("Min(Salary)", string.Empty));

        Console.Write("Average Salary:");
        Console.WriteLine(dtEmployee.Compute("Avg(Salary)", string.Empty));

        Console.Write("Sum Salary:");
        Console.WriteLine(dtEmployee.Compute("Sum(Salary)", string.Empty));

        Console.ReadLine();
    }

}

Output:

Employee Count:4
Maximum Salary:24000
Minimum Salary:21000
Average Salary:22500
Sum Salary:90000

C# / Csharp Foreach DataTable example

admin — Thu, 14 Jul 2011 12:57:35 +0000

Quick way to foreach datatable using C# / Csharp example.

Example:

using System;
using System.Data;

public class ForEachDataTableExample
{
    public static void Main()
    {
        //adding up a new datatable
        DataTable dtEmployee = new DataTable("Employee"); 

        //adding up 3 columns to datatable
        dtEmployee.Columns.Add("ID", typeof(int));
        dtEmployee.Columns.Add("Name", typeof(string));
        dtEmployee.Columns.Add("Salary", typeof(double));

        //adding up rows to the datatable
        dtEmployee.Rows.Add(52, "Human1", 21000);
        dtEmployee.Rows.Add(63, "Human2", 22000);
        dtEmployee.Rows.Add(72, "Human3", 23000);
        dtEmployee.Rows.Add(110,"Human4", 24000);

        //foreach datatable
        foreach (DataRow row in dtEmployee.Rows)
        {
Console.WriteLine(row["ID"].ToString() + ":" + row["Name"].ToString() + ":" + row["Salary"].ToString());
        }

        Console.ReadLine();
    }

}

Output:
52:Human1:21000
63:Human2:22000
72:Human3:23000
110:Human4:24000

Csharp / C# Yield return example

admin — Thu, 07 Jul 2011 11:21:14 +0000

C# yield return example.

Example:

using System;
using System.Collections.Generic;

    class ExampleYieldReturn
    {
        static void Main(string[] args)
        {
            //with every call it goes to where it left till it encounters yield return
            foreach(int n in GetNumbers())
            {
                Console.WriteLine(n);
            }

            Console.ReadLine();
        }

    public static IEnumerable GetNumbers()
        {
            Console.WriteLine("Print number 52");
            yield return 52; // will go back to the caller ie foreach

            Console.WriteLine("Print number 63");
            yield return 63;// again will go back to the caller ie foreach

            Console.WriteLine("Print number 72");
            yield return 72;// again will go back to the caller ie foreach

        }

    }

Output:
Print number 52
52
Print number 63
63
Print number 72
72

Csharp / C# send email example

admin — Thu, 07 Jul 2011 10:06:04 +0000

Csharp / C# send email a very simple example.

Example:

using System;
using System.Net.Mail;

    class Program
    {
        static void Main(string[] args)
        {
            try
            {

                MailMessage mail = new MailMessage();
                SmtpClient SmtpServer = new SmtpClient("smtp.net-tutorials.org");

                mail.From = new MailAddress("human@net-tutorials.org");
                mail.To.Add("being@net-tutorials.org");
                mail.Subject = "Being Human";
                mail.Body = "We are all humans! So come out of our way to help mankind.";
                SmtpServer.Send(mail);
            }
            catch (Exception ex)
            {
                Console.WriteLine("Seems some problem!");
            }

            Console.WriteLine("Email sent successfully!");
            Console.ReadLine();
        }

    }

Output:
Email sent successfully!

Csharp / C# Linq Aggregate example

admin — Fri, 17 Jun 2011 13:23:07 +0000

Example:

using System;
using System.Linq;
using System.Collections.Generic;

class LinqToListExample
{
public static void Main(string[] args)
{

int[] nums = { 1,2,3,4 };

var resutls = nums.Aggregate((n1,n2)=> n1 + n2);

// step1 n1 = 1, n2 = 2 => n1= (1+2) ie now n1 = 3
// step2 n1 = 3(output from 1st step) ,n2 = 3(third value in array) => n1 = (3+3) ie now n1 = 6
// step3 n1 = 6(output from 2nd step) ,n2 = 4(fourth value in array) => n1 = (6+4) ie now n1 = 10 (Answer)
Console.WriteLine(“The aggregate answer: ” + resutls);

Console.ReadLine();

}
}

Output:
The aggregate answer: 10

Csharp / C# Linq Average example

admin — Fri, 17 Jun 2011 13:22:38 +0000

Example:

using System;
using System.Linq;
using System.Collections.Generic;

class LinqAverageExample
{
public static void Main(string[] args)
{

int[] nums = { 51,52,53,63,72,110 };

var resutls = nums.Average(n => n);

Console.WriteLine(“The maximum number in the array: ” + resutls);

Console.ReadLine();

}
}

Output:
The maximum number in the array: 66.8333333333333

Csharp / C# Linq Max example

admin — Fri, 17 Jun 2011 13:22:08 +0000

Example:

using System;
using System.Linq;
using System.Collections.Generic;

class LinqMaxExample
{
public static void Main(string[] args)
{

int[] nums = { 51,52,53,63,72,110 };

var resutls = nums.Max(n => n);

Console.WriteLine(“The maximum number in the array: ” + resutls);

Console.ReadLine();

}
}

Output:
The maximum number in the array: 110

Csharp / C# Linq Min example

admin — Fri, 17 Jun 2011 13:21:36 +0000

Example:

using System;
using System.Linq;
using System.Collections.Generic;

class LinqMinExample
{
public static void Main(string[] args)
{

int[] nums = { 51,52,53,63,72,110 };

var resutls = nums.Min(n => n);

Console.WriteLine(“The minumum number in the array: ” + resutls);

Console.ReadLine();

}
}

Output:
The minumum number in the array: 51