Compare and contrast disconnected architecture vs connected architectu

In ASP.NET Web Forms, you can perform CRUD operations on an XML file using the XmlDocument class.

1. Create (Insert)

XmlDocument doc = new XmlDocument();

doc.Load(Server.MapPath("~/App_Data/products.xml"));

XmlElement product = doc.CreateElement("Product");

product.SetAttribute("id", "2");

XmlElement name = doc.CreateElement("Name");

name.InnerText = "Mobile";

product.AppendChild(name);

doc.DocumentElement.AppendChild(product);

doc.Save(Server.MapPath("~/App_Data/products.xml"));

```

2. Read

XmlNodeList list = doc.SelectNodes("/Products/Product");

foreach (XmlNode node in list)

{

string name = node["Name"].InnerText;

}

```

3. Update

XmlNode node = doc.SelectSingleNode("/Products/Product[@id='1']");

node["Name"].InnerText = "Updated Name";

doc.Save(path);

```

4. Delete

XmlNode node = doc.SelectSingleNode("/Products/Product[@id='1']");

node.ParentNode.RemoveChild(node);

doc.Save(path);

```

Use XPath to locate nodes and always save changes using doc.Save(). XML is suitable for small data storage; for larger apps, prefer a database.