🧩 ASP.NET

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📌 1. Definition

ASP.NET (Active Server Pages .NET) is a server-side web framework developed by Microsoft used to build dynamic web applications and websites.

👉 It mainly uses C# or VB.NET for coding.

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🌐 2. How ASP.NET Works (Diagram Description)

👉 Draw this in exam:

Browser → Request → Web Server (ASP.NET)
                       ↓
                 Process Code (C#)
                       ↓
              HTML Response → Browser

✔ Code runs on server, not visible to user.

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🧱 3. ASP.NET Architecture

Key Components:

• CLR (Common Language Runtime) → executes code
• .NET Framework → provides libraries
• Web Server (IIS) → handles requests

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🧾 4. ASP.NET Page Structure

<%@ Page Language="C#" %>
<html>
<body>
<%
Response.Write("Hello World");
%>
</body>
</html>

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🧠 5. Features of ASP.NET

• Server-side processing
• High performance
• Language independence
• Built-in security
• Easy database connectivity

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🧩 6. ASP.NET Controls

📌 Definition

Controls are elements used to build UI.

⭐ Types

1. HTML Controls

<input type="text">

2. Server Controls

<asp:TextBox ID="txtName" runat="server" />

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🔀 7. Event Handling

protected void Button1_Click(object sender, EventArgs e)
{
    Response.Write("Button Clicked");
}

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🌍 8. Form Handling

<asp:TextBox ID="txtName" runat="server" />
<asp:Button ID="btn" runat="server" OnClick="Button1_Click" />

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🗄️ 9. Database Connectivity

SqlConnection con = new SqlConnection("connection_string");
con.Open();

🔑 Steps

1. Create connection
2. Open connection
3. Execute query
4. Close connection

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🔐 10. State Management

Types:

1. ViewState

• Stores page data

2. Session

Session["user"] = "Ali";

3. Cookies

Response.Cookies["user"].Value = "Ali";

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📊 11. ASP.NET Life Cycle (Important)

👉 Draw this:

1. Page Request
2. Initialization
3. Load
4. Event Handling
5. Render
6. Unload

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⚠️ 12. Important Rules

✔ File extension: .aspx ✔ Uses C# or VB.NET ✔ Runs on IIS server ✔ Uses event-driven model ✔ Code is compiled

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📈 13. Advantages

• High speed (compiled code)
• Strong security
• Rich controls
• Easy debugging
• Scalable

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❌ 14. Limitations

• Requires Windows server (IIS)
• More complex than PHP
• Higher resource usage

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🔄 15. ASP.NET vs JSP vs PHP

Feature	ASP.NET	JSP	PHP
Language	C#	Java	PHP
Performance	High	High	Moderate
Complexity	Medium	High	Low
Platform	Windows	Cross-platform	Cross-platform

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❓ 16. Likely Exam Questions

Short Questions

1. Define ASP.NET.
2. What are server controls?
3. What is ViewState?
4. What is IIS?
5. What is Session in ASP.NET?

Long Questions

6. Explain ASP.NET architecture.
7. Describe ASP.NET life cycle.
8. Explain state management techniques.
9. Discuss ASP.NET controls with examples.
10. Compare ASP.NET with JSP and PHP.

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📝 17. Summary / Quick Revision

• ASP.NET = Microsoft server-side framework

• Uses C# / VB.NET

• Key concepts:

  • Server controls
  • Event handling
  • State management

• High performance due to compiled code

👉 Used for enterprise-level web applications.

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