Dot Net Basics

📘 .NET Framework – Basics & Concepts

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🔹 .NET

dot net is a framework.

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🔹 Framework

Framework- which supports all form based applications.

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🔹 Types of Code

1. Logical code (dot net - in which tools are dragged and dropped, they are not created using code, only code will be applied logically)

2. Design code (c++, Java - in which no drag and drop option will be available)

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🔹 Dot Net Supported Languages

1. Java

2. C# [mostly used]

3. Python

4. VB

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🔹 Dot Net Supported Environment

1. Console application (basic)

2. Web application (runs everywhere)

3. Windows application (local software)

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🔹 Basics of .NET

int x; // blue words are data types

x = int.Parse(Console.ReadLine()); // parsing

// int.Parse - for integer input
// float.Parse - for float input
// no conversion for string variable

Console.WriteLine(" the value of x is " + x); // Cascading operator

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🔹 Cascading Operator

CASCADING OPERATOR- MESSAGE + VARIABLE

It is a feature of dot net which separates message and variable

Example:

Console.WriteLine("the value is a" + a);

"+" is cascading operator.

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🔹 Program Management

Program can be managed by two ways:

1. Using conditions → (if else, switch) // Conditional Statements

2. Using flow (loop) → (while, do while, for) // Looping Statements

• while loop is called Entry loop

• do while loop is called Exit loop

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🔹 Types of Statements

1. Body statements (inside body)

2. Block statements (inside conditions)

3. Container statements (inside functions)

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🔹 Features of Good Programming

1. Minimum length

2. Fastest execution

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🔹 While Loop Drawback

Drawback of while loop is, it is MULTILINE loop.
To resolve this we have for loop which is SINGLELINE loop.

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🔹 Dot Net Area

1. Design (.aspx [it is created by the user])

2. Source (html format - Auto-generated)

3. Code (.aspx.cs)

👉 When we create .aspx file then .cs (code) is automatically generated along with .aspx

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🔹 Dot Net Environment

It consists of:

• Solution Explorer → contains all files, folders, directories, API etc.

• Server Explorer → all database related work

• Toolbox → contains all tools

• Property Window → properties of controls (text is common property)

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🔹 Programming Environment

1) User

Where the program is built

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2) Compiler

• Grouping the statements

• Error checking (Syntax error)

Types of Compiler

a) ON Compiler

• If error occurs, program will not execute (like C)

b) OFF Compiler (JIT - Just In Time Compiler)

• Works on event-driven error generation

• Example: Error in registration page does not affect login

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3) Interpreter

• Reads code line by line

• Handles runtime (logical) errors

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🔹 Creating First Web Application in .NET

Steps:

• File → New → Website

• Select Visual C# (language)

• Select ASP.NET Website

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🔹 Rules

1. Remove all files from Solution Explorer

2. Remove Account folder

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🔹 Creating First Web Form

(In dot net, web page is called as web form)

Steps:

1. Select root from Solution Explorer

2. Go to Website menu → Add New Item

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