07 gui 10

Editor's Notes

• #2: Start the session by sharing the session objectives with the students.
• #3: Using this slide and the next slide, discuss with the students that whenever a new software product is launched, there is a help system that helps the users to learn and understand the product in a better manner. Also whenever you purchase a new product, such as a mobile phone, TV, music system, or any other electronic gadget, there is a complete manual available with the product. This manual assists the person to understand the product completely and use it comfortably. Similarly, whenever you develop an application, you can attach a help system that will help the users using that application to understand the application better. The help system assists the users on performing an operation or provide information about a button or a dialog box.
• #5: Reiterate the concepts taught earlier by asking the given question.
• #6: Conduct the activity stated in the slide in a collaborative mode in the class.
• #7: Conduct the activity stated in the slide in a collaborative mode in the class.
• #8: Using this and the next slide, discuss the context-sensitive help with the students. A better way to make the students understand is with the help of a small demo that shows various properties to be set.
• #10: Reiterate the concepts taught earlier by asking the given question.
• #11: Using this slide, discuss the Pop-up help with the students. A better way to make the students understand is with the help of a small demo that shows various properties to be set.
• #12: Using this slide discuss with the students that at times the text appearing over the control, such as a button or label, may not be self-explanatory. Also, the user may see a text box on the form, but may not be sure about the type of data to be entered there. Therefore, in such situations a brief message can be displayed using the tooltip for that particular control. Discuss the various properties available with this control with the help of a small demo. This will make the learning better.
• #13: Discuss with the students that AutoPopDelay: Is used to set the time period for which the tool tip is displayed on the screen when the mouse pointer is stationary in a tool tip region. InitialDelay: Is used to set the time period for which the mouse pointer should be stationary in the tool tip region before the tool tip appears. ReshowDelay: Is used to set the time taken by the subsequent instances of the tool tip to appear when the mouse pointer is moved from one tool tip region to another
• #14: Initiate the discussion for components with the help of example. You can take the same example as in the SG. Alternately, you can use the following example also: A developer needs to develop a Student Details Application for a Computer Institute, that contains forms for: Student’s Personal Details Entry Student’s Batch Details Entry Student’s Fee Details Entry Student’s Appraisal Details Entry Each form has several text boxes and the following validations need to be done: 1) Some of the text boxes need to have only numeric data (such as telephone no, fee paid, marks obtained, total marks, project marks). 2) Some other text boxes need to have only alphabets (such as Student’s name, parent or guardian name, and faculty name) 3) Some of the text boxes can have alphanumeric characters. Instead of validating all these text boxes separately, the developer can design 2 reusable components: 1) A text box that can accept only numbers 2) A text box that can accept only alphabets The advantage of designing these components will be that the developer will not have to write code for validating all the text boxes separately. The developer can design these two types of text boxes once and reuse them whenever required.
• #15: Using this slide, discuss the two types of components with the students. Also try to give an example for each of them.
• #16: For the second point, discuss with the students that c lasses or components that are used internally by the assembly should have private access whereas a component that is intended for use outside the containing assembly should have public access.
• #17: Reiterate the concepts taught earlier by asking the given question.
• #18: For the second point, discuss with the students that c lasses or components that are used internally by the assembly should have private access whereas a component that is intended for use outside the containing assembly should have public access.
• #19: Discuss the concept of components with the student by taking an example. Discuss further that these components can have properties, methods, and events. This can be done with the help of an example.
• #20: Using this and the next slide, discuss the concept of in-process and out-of-process components with the students. In-process components run within the process space of the host application and are loaded at run-time. Out-of-process components, such as server applications, run as independent processes in the operating system. Using this concept, you can ask the students to compare the two types of components. Ask the following question to the students: What is the advantage and disadvantage of both the type of components? Collate the points discussed with the students and lead the discussion towards the following points: 1)Since in-process components run within the process space, therefore, accessing these components is less time consuming. 2)Since out-of-process components run as independent processes, therefore, accessing them is more time consuming. 3)Since in-process components run within the process space, therefore, only the application that accesses them can use it and multiple instances of these components will have to be created by all the applications that require them. 4)Since out-of-process components run as independent processes, therefore, any application that requires them can use it and multiple instances of these need not be created.
• #22: In addition to previous classification of .NET components, they can also be categorized as visual and non-visual components. Using this and the next slide, the faculty can explain these two types of components with the help of the following example : Non-Visual component: A class created that acts as a calculator. It has all the functionality of a calculator. Whenever the user needs to do calculations, he need not create fresh functions for that. He can create a reference of this class and use the functions within this class. Visual component: A component that is a numeric text-box. This component accepts only numbers and can be used in various applications whenever required.
• #24: You can summarize the session by using the summary given in the slides. In addition, you can also ask students summarize what they have learnt in this session.