generate barcode c# How Do I Get More Meaningful Information on My Form in Visual C#.NET

Creation QR in Visual C#.NET How Do I Get More Meaningful Information on My Form

How Do I Get More Meaningful Information on My Form
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Let s return to our CarTracker project. As you can see, the ColorID, MakeID, and CarTypeID combo boxes are there, but they are displaying the ID and not the name associated with the ID. This is not helpful for the user because an ID doesn't have any meaning to the user and he/she might not be able to easily add or modify rows without having a human-readable format for those columns. Consequently, you need to make sure the data is displayed in a humanly readable way and that the ID is stored in the row whenever the user modifies the information. There s an easy way to accomplish this, which you will do now for your three combo boxes.
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TO DATABIND WITH DOMAIN TABLES 1 surface over the ColorID combo box, and drop it.
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In the Data Sources window, select the Color table from the dataset, drag it onto the form s designer
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You ll see that another table adapter (colorTableAdapter) and another binding source (colorBindingSource) were added to the component tray. If you go to the ColorID combo box and click on the smart tag triangle, you ll see the Data Binding Mode information box appear, as shown in Figure 8-21. You ll notice that your drag-and-drop action bound the combo box control with the ColorBindingSource. Because of this action, whenever the combo box displays, it will display the color names instead of ColorID. When the user picks a color from the combo box, the associated value member that will be used in the row will still be the ColorID, specifically, the ColorID associated with the ColorName. Wonderful, isn t it And no lines of code were used. Repeat the same process for the Make and CarType dataset tables and the corresponding MakeID
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Figure 8-21 ColorID combo box smart tag information showing Data Binding Mode
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2 and CarTypeID combo boxes.
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3 not merely ColorIDs; the same is true for CarType and Make. The combo boxes are also populated
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Build and run your application and then look at each combo box. You now have real color names and
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This intelligent databinding is a new Visual Studio feature called Smart Defaults. Smart Defaults looks in the dataset table to see whether there s a column of type string by either the ID or the primary key. If so, it tries to use this one for the databinding.
with all of the values coming from those tables and not simply the value for that specific row. Click on the drop-down arrow and you ll see all other potential values. Close the application.
4 On the form, remove the ID part from the Color ID, Make ID, and Car Type ID labels. 5 change the Multiline property to true. Also change the MaxLength to 250, the Size:Height to 50,
and the Size:Width to 250. You will now enlarge the Notes field by making it a multi-line text box. Select the Notes text box and
6 Delete the ListingID text box and its label.
8: Managing the Data
7 does not need to be an exact duplicate. It will be good practice to bring back UI design concepts from
5 and also good preparation for 9. Change the Text property of the form to Car Tracker .
Size and reposition the controls on the form so that it resembles the form shown in Figure 8-22; it
Figure 8-22 New visual aspects of the Car Tracker application
8 in this project, click Yes.
In the Solution Explorer, rename form1.cs to Main.cs. When asked if you want to rename all references
9 Select the form and change the BackColor property to Highlight.
Everything is nearly complete for this application, but the research capabilities are lacking. Currently, the only way to search is to scan through all of the rows until you find the correct one. This is not difficult now because you have only two rows in your Car Tracker database. Yet, if you had 500 rows, the Scan method would not be effective at all! Therefore, you ll implement search capabilities by adding queries to your application by using the Dataset Designer.
10 In the Data Sources window, select CarTrackerDataSet. Right-click and select Edit DataSet with
Designer. Select the Listing data table, and then select the ListingTableAdapter section at the bottom of the
11 data table.
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When you look in the Properties window, you ll see that four types of queries were automatically generated by Visual Studio: SELECT, INSERT, DELETE, and UPDATE. They are the queries that helped you have a fully workable application without writing a single line of code. When you read about table adapters earlier, you learned that you can have multiple queries with a table adapter because it is the central point of data access. You will thus add search capabilities to your application by adding queries to the table adapters and by using parameters from the UI. First, you will add the ability to search for listings that have a certain color.
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