BCA: CS: Upload Part-A answers for PYQ NEP-2020

bca-students · Dec 14, 2024 · afa429e · afa429e
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 ## Part-A
 
 1.  ### a) What is an HTML element? Give example.
+      An HTML Element consists of a start tag, content, and an end tag, which together define the element’s structure and functionality. Elements are the basic building blocks of a webpage and can represent different types of content, such as text, links, images, or headings. [[1](https://www.geeksforgeeks.org/html-elements/)]
+
+      ```HTML
+      <!DOCTYPE html>
+      <html>
+
+      <head>
+          <title>BCA Students</title>
+      </head>
+
+      <body>
+          <p>Hello World!</p>
+      </body>
+
+      </html>
+      ```
+
     ### b) What do you mean by Boxing/Unboxing?
+      - **Boxing**:
+         - The process of converting a Value Type variable (char, int etc.) to a Reference Type variable (object).
+         - Boxing is an implicit conversion process in which object type (super type) is used.
+         - Reference type variables (which are essentially references) are stored on the stack, while the actual data they point to is stored on the heap.
+      - **Unboxing**:
+         - The process of converting a Reference Type variable into a Value Type variable is known as Unboxing.
+         - It is an explicit conversion process. [[1](https://www.geeksforgeeks.org/c-sharp-boxing-unboxing/)]
+
     ### c) List any four operators which cannot be overloaded.
+      - **Member Access Operator**: Used to access members of a class or structure.
+      - **Type Casting Operator**: Used for explicit type conversion.
+      - **Sizeof Operator**: Used to obtain the size of a type in bytes.
+      - **Throw Operator**: Used to throw exceptions. [[1](https://www.geeksforgeeks.org/c-sharp-operator-overloading/)]
+
     ### d) What is the significance of component tray?
+      The component tray is a rectangular region displayed at the bottom of the design view window while in design view mode, once it is active. The component tray becomes active in design view after a component that is displayed in the component tray has been added to or is part of the current document. The significance of the Component Tray:
+      - Event Handling
+      - Ease of Use 
+      - Visibility Control
+      - Resource Management [[1](https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.design.componenttray?view=windowsdesktop-9.0)]
+
     ### e) Differentiate between TextBox and Label controls.
+      | Feature                | TextBox                                      | Label                                      |
+      |------------------------|----------------------------------------------|--------------------------------------------|
+      | **Purpose**            | Used for user input; allows text entry.     | Used to display static text or information.|
+      | **User  Interaction**   | Editable by the user; can accept input.     | Non-editable; users cannot modify the text.|
+      | **Text Property**      | Can be changed at runtime based on user input. | Typically set at design time and remains constant.|
+      | **Appearance**         | Can have different styles (multiline, password, etc.). | Simple text display; can be styled but not for input.|
+      | **Events**             | Supports events like `TextChanged`, `KeyPress`, etc. | Supports events like `Click`, but not for text input.|
+      | **Focus**              | Can receive focus and is part of the tab order. | Cannot receive focus; not part of the tab order.|
+      | **Use Case**           | Ideal for forms where user input is required (e.g., entering names, passwords). | Ideal for displaying labels, instructions, or titles without user interaction. |
+
     ### f) Write the purpose of Dim and Redim keywords.
+      - **Dim**: The Visual Basic compiler uses the Dim statement to determine the variable's data type and other information, such as what code can access the variable. The following example declares a variable to hold an Integer value. [[1](https://learn.microsoft.com/en-us/dotnet/visual-basic/language-reference/statements/dim-statement)]
+      EXAMPLE: 
+         ```VB
+         Dim variable_name As Integer
+         ```
+      - **ReDim**: The ReDim statement is used to size or resize a dynamic array that has already been formally declared by using a Private, Public, or Dim statement with empty parentheses (without dimension subscripts). [[1](https://learn.microsoft.com/en-us/office/vba/language/reference/user-interface-help/redim-statement)] 
+      EXAMPLE:
+         ```VB
+         ReDim X(10, 10, 10) 
+         . . . 
+         ReDim Preserve X(10, 10, 15)
+         ```
+
     ### g) What is FormView control? List any two properties.
+      The FormView control is used to display a single record at a time from a data source. When you use the FormView control, you create templates to display and edit data-bound values. The templates contain controls, binding expressions, and formatting that define the look and functionality of the form. The Two properties are:
+      - Background
+      - Class Reference 
+
     ### h) What is Simple Binding?
+      The ability of a control to bind to a single data element, such as a value in a column in a dataset table. This is the type of binding typical for controls such as a TextBox control or Label control, which are controls that typically only displays a single value. [[1](https://learn.microsoft.com/en-us/dotnet/desktop/winforms/data-binding-and-windows-forms?view=netframeworkdesktop-4.8)]
 
 ## Part-B [Unit-1]