XLINQ Operations

To use XLINQ objects we need to import the following dll. 

System.Xml.Linq

XLinq

. NET Language Integrated Query for XML Data

XLinq was developed with Language Integrated Query over XML in mind from the beginning.   

It takes advantage of the Standard Query Operators and adds query extensions specific to XML. 

From an XML perspective XLinq provides the query and transformation power of XQuery and XPath integrated into .NET Framework languages that implement the LINQ pattern (e.g., C#, VB, etc.). 

This provides a consistent query experience across LINQ enabled APIs and allows you to combine XML queries and transforms with queries from other data sources.  

Code to delete records from an xml file by using XLINQ objects

 protected void Delete_Click(object sender, EventArgs e)
{
    XDocument Names = XDocument.Load(Server.MapPath(@"~/App_Data/Names.xml"));

        // To remove attribute for XML Element

        if (xe.Element("FN").Value == "Cherukuri") 
        { 
            xe.Attribute("Age").Remove(); 
        } 
    } 
    Names.Save(Server.MapPath(@"~/App_Data/Names.xml"));
}

Code to update records in an xml file by using XLINQ objects

 protected void Update_Click(object sender, EventArgs e)
{ 
    XDocument Names = XDocument.Load(Server.MapPath(@"~/App_Data/Names.xml")); 

    // To updating XML elements 

    foreach (XElement xe in Names.Elements("Names").Elements()) 
    { 
        if (xe.Element("FN").Value == "Cherukuri") 
        { 
            xe.Element("LN").SetValue("Venky"); 
            xe.Attribute("Age").SetValue("26"); 
        } 
    } 

    Names.Save(Server.MapPath(@"~/App_Data/Names.xml"));
}

Code to insert records into an xml file by using XLINQ objects

 protected void Add_Click(object sender, EventArgs e)
{ 
    XDocument Names = XDocument.Load(Server.MapPath(@"~/App_Data/Names.xml")); 

    // To add new Element to XML file

    Names.Element("Names").Add( 
        new XElement("Name", 
            new XElement("FN", "Cherukuri"), 
            new XElement("LN", "Venkateswarlu"), 
            new XAttribute("Age", "25"))); 

    Names.Save(Server.MapPath(@"~/App_Data/Names.xml"));
}

Code to retrieve records from an xml file by using XLINQ objects

 protected void Get_Click(object sender, EventArgs e)
{ 
    XElement Names = XElement.Load(Server.MapPath(@"~/App_Data/Names.xml")); 

    // To retrieve Elemnts from XML file

    var names = from CH in Names.Elements("Name") 
                select new 
                { 
                    FN = CH.Element("FN").Value, 
                    LN = CH.Element("LN").Value, 
                    Age = CH.Attribute("Age").Value 
                }; 

    GridView1.DataSource = names; 
    GridView1.DataBind();
}