Some Linq queries for beginners

Following are some of the basic Linq command/samples for those who just want to start learning Linq. So this will help a lot to all the beginners to easily understand Linq queries.

// Basic Query

// To achieve  Select * From ProductMst  you need to write following linq Query

  var Result1 = from p in db.ProductMst

                 select p;

// To achieve  Select ProductID, ProductName, Price From ProductMst you need to write following linq Query

    var Result2 = from p in db.ProductMst

                 select new {

                     p.ProductID,

                     p.ProductName,

                     p.Price

                 };

// Where Clause Query

// To achieve  Select * From ProductMst Where ProductID = 1 you need to write following linq Query

    var Result3 = from p in db.ProductMst

                 where p.ProductID == 1

                 select p;

// To achieve Select * From ProductMst Where SupplierId =2 and Price > 10 you need to write following linq Query

    var Result4 = from p in db.ProductMst

                 where p.SupplierID == 2 && p.Price > 10

                 select p;

// To achieve Select * From ProductMst Where SupplierId =2 Or SupplierId=5 you need to write following linq Query

    var Result5 = from p in db.ProductMst

                 where p.SupplierID == 2 || p.SupplierID == 5

                 select p;

// Order By Query

//To achieve   Select * From ProductMst Order By ProductId you need to write following linq Query

    var Result6 = from p in db.ProductMst

                 orderby p.ProductID

                 select p;

// To achieve  Select * From ProductMst Order By ProductId Desc you need to write following linq Query

    var Result7 = from p in db.ProductMst

                 orderby p.ProductID descending

                 select p;

// To achieve  Select * From ProductMst Order By CategoryId, Price Desc you need to write following linq Query

    var Result8 = from p in db.ProductMst

                 orderby p.CategoryID, p.Price descending

                 select p;

// Top Query

//To achieve Select Top 5 * From ProductMst you need to write following linq Query

    var Result9 = (from p in db.ProductMst

                 select p).Take(5);

//To achieve Select Top 1 * From ProductMst you need to write following linq Query

    var Result10 = (from p in db.ProductMst

                   select p).Take(1);

     or

    var Result11 = (from p in db.ProductMst

                   select p).First();

// Distinct Query

//To achieve Select Distinct CategoryId From ProductMst you need to write following linq Query

    var Result13 = (from p in db.ProductMst

                   select p.CategoryID).Distinct();

// Group By Query

//To achieve Select CategoryId, Count(CategoryID) As FieldName From ProductMst Group By CategoryId you need to write following linq Query

    var Result14 = from p in db.ProductMst

                  group p by p.CategoryID into g

                  select new {

                      CategoryId = g.Key,

                      FieldName = g.Count()

                  };

//To achieve Select CategoryId, Avg(UnitPrice) As NewField From ProductMst Group By CategoryId you need to write following linq Query

    var Result15 = from p in db.ProductMst

                  group p by p.CategoryID into g

                  select new {

                      CategoryId = g.Key,

                      FieldName = g.Average(S => S.Price)

                  };

// Union Query

//To achieve Select * From ProductMst Where CategoryId =1 union Select *  From ProductMst Where 

CategoryId = 2 you need to write following linq Query

    var Result17 = (from p in db.ProductMst

                   where p.CategoryID == 1

                   select p).Union(

                       from m in db.ProductMst

                       where m.CategoryID == 2

                       select m

                   );

// Inner Join

// To achieve select p.ProductName, c.categoryName from ProductMst p inner join CategoryMst c 

on p.CategoryID=c.Category  you need to write following linq Query

   var Result18=from n in db.ProductMst

                        join c in db.CategoryMst

                        on n.CategoryID equals c.CategoryID

                        select new

                        {

                           n.ProductName, c.categoryName 

                        };

Detect / Find Client IP Address using JavaScript & jQuery

In this short article I will explain how to detect / find the IP Address of the client / user machine using JavaScript & jQuery.

I have added an HTML <span> tag which will display the IP Address of the client machine. To get the IP Address I am making a JSON call to the Free Web Servicehttp://jsonip.appspot.com/ and I am passing the name of the callback function which will be called on completion of the request.

When the request is completed the IP address present in the response object is displayed in the HTML <span> tag

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<title></title>

<script type="text/javascript">

    window.onload = function () {

        var script = document.createElement("script");

        script.type = "text/javascript";

        script.src = "http://www.telize.com/jsonip?callback=DisplayIP";

        document.getElementsByTagName("head")[0].appendChild(script);

    };

    function DisplayIP(response) {

        document.getElementById("ipaddress").innerHTML = "Your IP Address is " + response.ip;

    }

</script>

</head>

<body>

    <form>

        <span id = "ipaddress"></span>

    </form>

</body>

</html>

jQuery Crop Image in Asp.net using Jcrop jQuery Plugin and Upload to Folder

Here I will explain how to crop image in asp.net using jcrop jQuery plugin or jQuery image crop and upload in asp.net using jQuery jcrop plugin. Jcrop is a powerful image cropping engine for jQuery by using this jcrop plugin we can add cropping functionality easily to your web application.

Designer Source Code:

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

    <title>jQuery Crop Image using crop plugin</title>

    <script type="text/javascript" src="http://code.jquery.com/jquery-1.8.2.js"></script>

    <script src="jquery.Jcrop.js" type="text/javascript"></script>

    <link href="jquery.Jcrop.css" rel="stylesheet" type="text/css" />

    <script type="text/javascript">

        $(function() {

        $('#imgcrop').Jcrop({

        onSelect: getcroparea

            });

        })

        function getcroparea(c) {

            $('#hdnx').val(c.x);

            $('#hdny').val(c.y);

            $('#hdnw').val(c.w);

            $('#hdnh').val(c.h);

        };

    </script>

   

</head>

<body>

    <form id="form1" runat="server">

    <div>

        <img src="images/pool.jpg" id="imgcrop" alt="sample image"/>

        <input type="hidden" id="hdnx" runat="server" />

        <input type="hidden" id="hdny" runat="server"/>

        <input type="hidden" id="hdnw" runat="server"/>

        <input type="hidden" id="hdnh" runat="server" />

        <asp:Button ID="btncrop" runat="server" OnClick="btncrop_Click" Text="Crop Images" />

        <img id="imgcropped" runat="server" visible="false" />

    </div>

    </form>

</body>

</html>

 Code Behind :

using System;

using System.Drawing;

using System.IO;

using Image = System.Drawing.Image;

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

{

    protected void Page_Load(object sender, EventArgs e)

    {

    }

    protected void btncrop_Click(object sender, EventArgs e)

    {

        try

        {

                string fname = "pool.jpg";

                string fpath = Path.Combine(Server.MapPath("~/images"), fname);

                Image oimg = Image.FromFile(fpath);

                Rectangle cropcords = new Rectangle(

                Convert.ToInt32(hdnx.Value),

                Convert.ToInt32(hdny.Value),

                Convert.ToInt32(hdnw.Value),

                Convert.ToInt32(hdnh.Value));

                string cfname, cfpath;

                Bitmap bitMap = new Bitmap(cropcords.Width, cropcords.Height, oimg.PixelFormat);

                Graphics grph = Graphics.FromImage(bitMap);

                grph.DrawImage(oimg, new Rectangle(0, 0, bitMap.Width, bitMap.Height), cropcords, GraphicsUnit.Pixel);

                cfname = "crop_" + fname;

                cfpath = Path.Combine(Server.MapPath("~/cropimages"), cfname);

                bitMap.Save(cfpath);

                imgcropped.Visible = true;

                imgcropped.Src = "~/cropimages/" + cfname;

            }

            catch (Exception ex)

            {

                throw ex;

            }

    }

}

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