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1. At the bottom of the Options.cs file, add the following UpdateCurrentInfo method:
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private void UpdateCurrentInfo() { if ((txtCurrentCity.Text != String.Empty) && (lbPossibleCities.Items.Count != 0)) { if (this.lbPossibleCities.SelectedValue.ToString() != Settings.Default.CurrentLocationCode) { Settings.Default.CurrentLocationCode = this.lbPossibleCities.SelectedValue.ToString(); Settings.Default.CurrentLocation = this.lbPossibleCities.SelectedItem.ToString(); Main.currentLocation = this.lbPossibleCities.SelectedItem.ToString(); Main.currentLocationCode = this.lbPossibleCities.SelectedValue.ToString(); } } if (rbCelsius.Checked == true) { Settings.Default.CurrentUnit = C ; Main.currentUnit = C ; } else { Settings.Default.CurrentUnit = F ; Main.currentUnit = F ; } Settings.Default.Save(); }
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2. Place your cursor within the Settings text. You should see a familiar yellow and red Smart Tag. This Smart Tag is there to let you know that the Settings class isn t listed in your using directives at the top of Options.cs. Move your mouse pointer over the Smart
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9: Building Your Own Weather Tracker Application
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Tag, click the down arrow, and then select using Weather_Tracker.Properties; to add it to your list of using directives. The UpdateCurrrentInfo method saves the user s location code and location, as well as the unit selected to display the temperature, and stores those values with the application settings. It also calls the UpdateWeather method in the code for the Main form to update the weather data for the new location code. The UpdateCurrentInfo method is called when the user clicks OK in the Options dialog box. To get the temperature unit the user selected after using the application for a while, you must load it when you open the Options form: 1. Select the Options form in the Design view by clicking the form s title bar. 2. In the Properties window, click the Events button (yellow lightning icon) to get the events list, and double-click the Load event. 3. In the Options_Load event handler, add the following code:
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private void Options_Load(object sender, EventArgs e) { if (Settings.Default.CurrentUnit == F ) { rbFahrenheit.Checked = true; } else { rbCelsius.Checked = true; } }
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Testing Weather Tracker Options
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Now you will test the Options dialog box. Press F5 to run Weather Tracker. Once the splash screen disappears, right-click the icon in the notification area, and click Options. In the Options dialog box, test the location name. For example, try typing some garbage, and press Enter. In this case, you should get the error provider to the left of the text box, as shown in Figure 9-11, letting you know that there were no results for the search query you made!
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Figure 9-11 The error provider control indicating an error
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Microsoft Visual C# 2008 Express Edition: Build a Program Now!
When you have finished, type a valid location name, and click OK. Select the city from the list that matches the one you d like to monitor. It is quite fast, and you should see weather data for the new location code. You should be proud of yourself. You ve developed an application with numerous complex features, and it works! The Weather Tracker application accomplishes the basic features established at the beginning of the chapter. There is plenty of room for enhancement. Now it s time to learn how to distribute Weather Tracker or another application.
And Now, Just ClickOnce
The ClickOnce technology has been available since .NET Framework 2.0. It s a fantastic feature that lets you customize how your applications and tools get onto other people s machines. It s very easy almost as easy as deploying Web applications, which often entails merely copying files onto a server. With ClickOnce, you, the developer, can distribute your application via a robust and reliable mechanism. You can deploy on Web servers, on file servers, or on CDs/DVDs. In addition, you can add the .NET Framework to your distribution package along with SQL Server 2005 Express Edition if your application needs it. ClickOnce handles rollback and uninstall well, and it s a charm for pushing new updates. In this case, you ll deploy to a CD/DVD.
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