Accessing Settings at Run Time in .NET framework

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Accessing Settings at Run Time
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' VB My.Settings.TitleSetting = "This is the new title" // C# Properties.Settings.DefaultSettings.TitleSetting = "This is the new Title"; Properties.Settings.DefaultSettings.Save();
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1. What is the purpose of the Timer component 2. What is the purpose of the ErrorProvider component
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1. The Timer component is used to execute code at regular intervals. 2. The error provider is used to provide a visual cue to users when a validation error occurs.
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Lab: Practice with User Assistance Controls
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In this lab, you will create a small application that uses a timer to display and update the current time in a label, and you will use the functionality and many of the controls that have been discussed in this lesson. Although the end result of the lesson is some what contrived, it will allow you to practice with the different aspects of this lesson.
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Exercise 1: Creating a Simple Digital Clock
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1. In Visual Studio, create a new Windows Forms application. 2. From the Toolbox, drag a Label control and a Timer component onto the form. 3. Select the Timer component. In the Properties window, set the Interval property to 1000 and the Enabled property to True. 4. In the Designer, double-click the Timer component to open the default event handler for the Timer1.Tick event. Add the following code to this method:
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12
Enhancing Usability
' VB Label1.Text = Now.ToLongTimeString // C# label1.Text = System.DateTime.Now.ToLongTimeString();
5. Press F5 to compile and run your application. Note that the current time is updated in the Label control every second.
Exercise 2: Using the PropertyGrid
1. From the Toolbox, drag a PropertyGrid control onto the form that you created in the last exercise. 2. In the Properties window, set the Dock property of the PropertyGrid control to Right. 3. In the Properties window, set the SelectedObject property of the PropertyGrid con trol to Timer1. 4. Press F5 to compile and run the application. You can now set the properties of the Timer at run time via the PropertyGrid control.
Exercise 3: Providing Tooltips for Your Application
1. From the Toolbox, drag a ToolTip component onto the form you created in Exer cise 1, Creating a Simple Digital Clock. 2. Select Label1. In the Properties window, set the tooltip on ToolTip1. 3. Press F5 to compile and run your application. Note that your label now has a tooltip associated with it.
Exercise 4: Using Settings
1. In Solution Explorer, for the application you started in Exercise 1, right-click the project and choose Properties. 2. In the Properties pane, choose the Settings tab. 3. In the Settings window, create a setting with the following properties: Property Name Type Scope Value Value IntervalSetting Integer User 1000
Lesson 2: Using User Assistance Controls and Components
4. In the Designer, select Timer1. In the Properties window, expand (Application Settings) and then click the button next to (PropertyBinding) to open the Appli cation Settings window. 5. In the Application Settings window, bind the Interval property to the IntervalSetting setting. 6. In the Designer, select the Form. In the Properties window, click the events but ton to list the events for the form. Double-click the cell next to the FormClosing event to open the default event handler for the Form1.FormClosing event. Add the following code to this event handler:
' VB My.Settings.IntervalSetting = Timer1.Interval // C# Properties.Settings.Default.IntervalSetting = timer1.Interval; Properties.Settings.Default.Save();
7. From the File menu, choose Save All. 8. Press F5 to compile and run your application. Any changes that you make to the interval property will be persisted between sessions.
Lesson Summary
The PropertyGrid control allows you to set properties for controls in your appli cation through a grid-style user interface. The SelectedObject property indicates the object for which the properties can be set. The ProgressBar control allows you to inform the user about progress for timeconsuming processes such as file downloads. The Minimum and Maximum prop erties represent the minimum and maximum values for the ProgressBar, and the Value control represents the current value. The StatusStrip control is a ToolStrip control that is designed to display information about the status of the application. ToolStripStatusLabel and ToolStripProgressBar are ToolStripItem controls that are designed to work with the StatusStrip. The ToolTip component allows you to display tooltips for the controls on your form. The ErrorProvider component allows you to display errors in user input in your application. You can validate user input by adding code to the Validating event handler. If the user input is not valid, use the SetError method of the error pro vider to set the error.
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