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' Invalidate the cell. Me.DataGridView.InvalidateCell(Me.ColumnIndex, rowIndex) End Sub Protected Overrides Sub Paint(ByVal graphics As Graphics, _ ByVal clipBounds As Rectangle, ByVal cellBounds As Rectangle, _ ByVal rowIndex As Integer, _ ByVal cellState As DataGridViewElementStates, _ ByVal value As Object, ByVal formattedValue As Object, _ ByVal errorText As String, _ ByVal cellStyle As DataGridViewCellStyle, _ ByVal advancedBorderStyle As DataGridViewAdvancedBorderStyle, _ ByVal paintParts As DataGridViewPaintParts) ' Is the mouse hovering over this cell If inCell = rowIndex ' (Perform the gradient painting shown earlier.) Else ' Perform the standard painting. MyBase.Paint(graphics, clipBounds, cellBounds, rowIndex, _ cellState, value, formattedValue, errorText, cellStyle, _ advancedBorderStyle, paintParts) End If End Sub End Class You can also override methods like PaintErrorIcon() and PaintBorder() to customize these details in the visual representation of your cell. (Although a bug that s present in the first release on .NET 2.0 ensures that PaintErrorIcon() isn t actually called.) You can t place a custom DataGridViewCell directly into a DataGridView. Instead, you need to place your cell into a column and then add that column to the grid. To create a custom column, you simply need to derive a class from DataGridViewColumn. In your custom column class, you can override functionality, add useful properties, or just set reasonable defaults in the constructor. However, in this case all you need to do is associate the custom cell with the custom column. You can achieve that with the single line of code in the constructor shown here: Public Class GradientRolloverColumn Inherits System.Windows.Forms.DataGridViewColumn Public Sub New() MyBase.CellTemplate = New GradientRolloverCell() End Sub End Class This code sets the DataGridViewColumn.CellTemplate property to an instance of your custom DataGridViewCell. In other words, the DataGridViewColumn will use this class every time the DataGridView asks it to create a new cell.

In the examples so far in this chapter, you ve been manipulating native XML data within the confines of the XMLTYPE data type. The Oracle database supports yet another cool feature the ability to read and manipulate relational data as XML!

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The final step is to add the custom column into the grid. Here s the code that accomplishes this task: ' Hide the ordinary version of this column. dataGridView1.Columns(0).Visible = False ' Create custom column. Dim colGradient As New GradientBackgroundColumn() colGradient.DataPropertyName = dataGridView1.Columns(0).DataPropertyName colGradient.HeaderText = dataGridView1.Columns(0).HeaderText colGradient.Width = dataGridView1.Columns(0).Width colGradient.ReadOnly = dataGridView1.Columns(0).ReadOnly colGradient.ValueType = dataGridView1.Columns(0).ValueType colGradient.DisplayIndex = 0 ' Add the custom column. dataGridView1.Columns.Add(colGradient) The custom column class is also a great place to define properties that should apply to all your custom cells. For example, instead of hard-coding the gradient color, you can add a property in the column class: Public Class GradientRolloverColumn Inherits System.Windows.Forms.DataGridViewColumn Public Sub New(ByVal gradientColor As Color) Me.GradientColor = gradientColor MyBase.CellTemplate = New GradientRolloverCell() End Sub Private color As Color Public Property GradientColor() As Color Get Return color End Get Set(ByVal value As Color) color = value End Set End Property End Class You can retrieve a reference to the parent column using the DataGridViewCell. OwningColumn property. In this example, you need to cast the column to the correct type and retrieve the color in your drawing logic:

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Note Relational data, as opposed to hierarchical data, refers to the standard two dimensional table-column data format that you are familiar with. The ADO.NET DataSet object, for example holds relational data. The XMLTYPE column holds hierarchical data.

.NET addresses these problems by being more ambitious. The result is a user-interface framework that uses some innovative sleight of hand to perform tasks that are difficult or seemingly impossible with the Windows API. Here are some examples: Change fixed style properties like the selection type of a list box or the border type of a window after its creation. Change a form s owner. Move an MDI child window from one MDI parent window to another. Transform an MDI child window into an MDI parent and vice versa. Move controls from one container to another. Clearly this list includes a couple of tricks that a self-respecting application will probably never need to use. Still, they illustrate an important fact: .NET doesn t just provide an easier object model to access the Windows API it also provides capabilities that extend it. The result is a framework that works the way you would intuitively expect it to work based on its objects.

Note The online samples for this chapter include a project named ImpossibleAPI, which shows one of

This means that you can run an SQL query on any table in Oracle and have it return XML instead of a record set, for instance. You can also do this in the opposite direction inserting records into a table by passing the data in as XML. There are three different ways that you can retrieve relational data as XML, of which you will learn in the following individual sections: Using the XMLCommandType property Using the Dataset.GetXML method Using the DBMS_XMLGEN.GETXML stored procedure

these broken rules a child window that can jump between different MDI parents whenever the user clicks a button.

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