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Allows permanent changes. For example, this allows a data-bound control to commit its changes back to the bound data object. This interface provides BeginEdit(), EndEdit(), and CancelEdit() methods. Allows data sources to offer error information that a control can bind to. This information consists of two strings: the Error property, which returns general error message text (for example, An error has occurred ) and the Item property, which returns a string with a specific error message from the column (for example, The value in the Cost column cannot be negative ).

processors only. It is recommended that you use a 64-bit compatible processor to make sure that you can upgrade to future versions.

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The DataView, DataViewManager, and DataRowView ADO.NET objects work together to implement all these interfaces. This means that when you bind to a DataSet, you acquire a much greater level of functionality. For example, if you modify the multiple control sample to use input controls, you will be able to make changes that permanently modify the DataSet. When you navigate to a changed record, you will see that its change persists. Furthermore, if multiple controls display the same data (for example, if you use a list control for navigation and allow the same field to be modified in a text box), they will all be updated with the new content when you browse back to the record. You can see this behavior with the product name field in the following example. private void EditableBinding_Load(object sender, EventArgs e) { DataTable dt = Program.StoreDB.GetProducts(); cboModelName.DataSource = dt; cboModelName.DisplayMember = "ModelName"; txtModelName.DataBindings.Add("Text", dt, "ModelName"); txtModelNumber.DataBindings.Add("Text", dt, "ModelNumber"); txtUnitCost.DataBindings.Add("Text", dt, "UnitCost"); txtDescription.DataBindings.Add("Text", dt, "Description"); } In this example, the code is largely unchanged. The key difference is that the Label controls are replaced with TextBox controls so the data object can be modified. Figure 8-10 shows the corresponding form. Of course, a change made to the data set won t affect the original data source, it simply changes the linked DataRow object. Remember, the DataSet is always disconnected by nature. To commit changes, you need to add something like an update button, which would then presumably call a method like StoreDB.UpdateProducts(). This method would use the DataAdapter.Update() method to commit changes back to the database. But because this book only covers the user interface aspect of your code, we don t explore these details here.

The next number in the series is formed from the current number squared plus the original number. If repeated iteration of this equation stays between the complex number C(1, 1i) and C( 1, 1i), then the original complex number is a member of the Mandelbrot set. This can be implemented in F# with the following: open Microsoft.FSharp.Math open Microsoft.FSharp.Math.Notation let let let let cMax = complex 1.0 1.0 cMin = complex -1.0 -1.0 iterations = 18 isInMandelbrotSet c0 = let rec check n c = (n = iterations) or (cMin < c) && (c < cMax) && check (n + 1) ((c * c) + c0) check 0 c0

The Control object defines a Text property that is used by derived controls for a variety of purposes. For a text box, the Text property corresponds to the information displayed in the text box, which can be modified by the user. For controls like labels, command buttons, or forms, the Text property refers to static descriptive text displayed as a title or caption. The font of a control s text is defined by the Font property, which uses an instance of the System.Drawing.Font class. Note that a Font object does not just represent a typeface (such as Tahoma). Instead, it encapsulates all details about the font family, point size, and styles (like bold and italic). // You can create a font with one of the 13 constructors. ctrl.Font = new Font("Tahoma", 8, FontStyle.Bold);

The Font class also provides a Height property, which returns the line spacing of your chosen font in pixels. This setting allows you to perform calculations when you are drawing special graphics or text on a control manually. For example, you could manually space lines the appropriate amount when drawing text directly onto a form background.

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