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The third parameter is the field in the DataSource that is used for the binding If you use this code statement on its own, you ll get a slightly perplexing result The price of the first record in the DataTable will appear in the text box However, there won t be any way to move to other items Programmers who are familiar with traditional data binding will probably expect that they need to add specialized navigation controls to the form This isn t the case Instead, you have two options controlling navigation programmatically (which is described a little later in this chapter) or adding another control that uses complex binding to provide navigation For example, you can combine the list control example and the text box example to make this example more workable Now, you can move from record to record simply by selecting items in the list box.

let floatArrayList = let temp = new ArrayList() temp.AddRange([| 1.0; 2.0; 3.0 |]) temp let (typedFloatSeq: seq<float>) = Seq.cast floatArrayList Using cast function always required using type annotations to tell the compiler what type of list you are producing. Here you have a list of floats, so you use the type annotation IEnumerable<float> to tell the compiler it will be an IEnumerable collection containing floating-point numbers.

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When you do, all the other bound controls on the form are updated to show the values from the corresponding record In other words, the form keeps track of your position, and all bound controls are synchronized to it To see this in action, consider the following form, which displays the information from a product record using a combination of three labels and a drop-down list control (see Figure 8-8) This list control allows navigation when the user selects a different model name, the other data-bound controls are updated automatically..

From the Computers & Backup tab of the Windows Home Server Console, you can select a computer and click View Backups to display a list of all backups that are available for that computer, as shown in Figure 7-3. All backups whether they completed successfully or failed will be listed here. The padlock shown next to the date in the example indicates that the backup will be kept until you choose to have it deleted.

Figure 8-8. Creating a record browser Here s the code that sets up the data bindings: private void MultipleControlBinding_Load(object sender, EventArgs e) { // Get the data object. DataTable dt = Program.StoreDB.GetProducts(); // Use complex binding. cboModelName.DataSource = dt; cboModelName.DisplayMember = "ModelName"; // Use simple binding. lblModelNumber.DataBindings.Add("Text", dt, "ModelNumber"); lblUnitCost.DataBindings.Add("Text", dt, "UnitCost"); lblDescription.DataBindings.Add("Text", dt, "Description"); }

The nicest thing about single-value binding is that it can be used with almost any property. For example, you could set the background color of a text box, or specify the font. Unfortunately, there is no implicit type conversion when setting these specialized properties, which means you can t easily convert a string representing a font name into an actual font object. The example that follows (Figure 8-9) demonstrates some of the extra effort you need to make if you want to bind one of these properties, and it makes for an interesting example of extreme data binding. Two list boxes are bound to the Font and ForeColor properties of a Label control. As you select different items in the list, the label changes automatically.

The Printf module provides functions for formatting strings in a type-safe way. The functions in the Printf module take a string with placeholders for values as their first argument. This returns another function that expects values for the placeholders. You form placeholders by using a percentage sign and a letter representing the type that they expect. Table 7-2 shows the full list. Table 7-2. Printf Placeholders and Flags

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