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Thus, when one (or both) of the nullable objects used in a comparison is null, the result of that comparison is always false Thus, null does not participate in an ordering relationship You can test whether a nullable object contains null, however, by using the == or != operators For example, this is a valid test that will result in a true outcome:

Binding(string propertyName, object dataSource, string dataMember);

if(upper == null) //

Gets the BindingManagerBase class instance for the data source used by this binding. Gets the BindingMemberInfo structure containing information about the data member used by this binding. This value is created using the dataMember value passed to the Binding constructor. For a database source, this indicates the table and column that should be bound. For an IList source, this indicates the property member in the contained object that should be bound. Gets the control that is the subject of this binding. Gets the data source used by this binding, taken from the corresponding value passed to the Binding constructor. Gets whether this binding is currently active. Gets or sets the property name of the control that is the subject of this binding. This is taken from the corresponding value passed to the Binding constructor. Occurs when the value from the data source must be processed, or formatted, and assigned to the bound property in the control. Occurs when the value from the control must be processed, or parsed, and assigned to the appropriate entry in the data source.

When a logical expression involves two bool objects, the outcome of that expression will be one of three values: true, false, or null (undefined) Here are the entries that are added to the truth table for the & and | operators that apply to bool

20:

So let s do this. We already have a PhotoAlbum field in our MainForm class, so we can bind these controls in our OnLoad method, as shown in the following table.

U n s a f e C o d e , P o i n t e r s , N u l l a b l e Ty p e s , a n d M i s c e l l a n e o u s To p i c s

BIND THE PHOTO TAB CONTROLS TO PROPERTIES IN THE PHOTOGRAPH CLASS Action 1 Locate the OnLoad override in the MainForm.cs code window. Assign data bindings to the controls on the Photo tab page. Note: Of critical importance here is the fact that we use the same PhotoAlbum instance throughout the life of our application. Since we bind these controls as the main form is loaded, the value of our album cannot change unless we also rebind the controls to the new value. Result

Beginning with C# 20, a class, structure, or interface definition can be broken into two or more pieces, with each piece residing in a separate file This is accomplished through the use of the partial keyword When your program is compiled, the pieces are united When used to create a partial type, the partial modifier has this general form: partial type typename { // Here, typename is the name of the class, structure, or interface that is being split into pieces Each part of a partial type must be modified by partial Here is an example that divides a simple XY coordinate class into three separate files The first file is shown here:

partial class XY { public XY(int a, int b) { X = a; Y = b; } }

protected override void OnLoad(EventArgs e) { . . . // Bind data for the Photo tab txtFileName.DataBindings. Add("Text", _album, "FileName"); txtCaption.DataBindings. Add("Text", _album, "Caption"); txtPhotographer.DataBindings. Add("Text", _album, "Photographer"); dtpDateTaken.DataBindings. Add("Value", _album, "DateTaken"); txtNotes.DataBindings. Add("Text", _album, "Notes"); pboxPhoto.DataBindings. Add("Image", _album, "Image"); }

The second file is shown next:

The controls are now bound to the appropriate properties of the Photograph objects contained by the PhotoAlbum instance. Take, for example, the DateTimePicker control. We bind the Value property of this control to the DateTaken property of the active Photograph object in the _album collection with the following code:

partial class XY { public int X { get; set; } }

partial class XY { public int Y { get; set; } }