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try { OracleConnection _connObj = new OracleConnection(_connstring); _connObj.Open(); string _sql = "SELECT INFO FROM PRODUCT_EXTRAINFO"; OracleCommand _cmdObj = new OracleCommand(_sql, _connObj); OracleDataReader _rdrObj = _cmdObj.ExecuteReader (); if (_rdrObj.HasRows) { while (_rdrObj.Read()) { String _message =""; String _regionalprices=""; XmlReader _xmlRdr = _rdrObj.GetXmlReader (_rdrObj.GetOrdinal("INFO")); //Now that we have an XMLReader object, we create an XMLDocument //object so that we can manipulate its elements XmlDocument _xmlDoc = new XmlDocument(); _xmlDoc.Load(_xmlRdr); XmlNode _xmlRoot = _xmlDoc.FirstChild; XmlNode _xmlCategory = _xmlRoot.SelectSingleNode("CATEGORY"); XmlNode _xmlPerson = _xmlRoot.SelectSingleNode ("PERSON_IN_CHARGE"); XmlNode _xmlRegionalPricing =_xmlRoot.SelectSingleNode ("REGIONAL_PRICING"); for (int i = 0; i < _xmlRegionalPricing.ChildNodes.Count; i++) { XmlNode _xmlRegion = _xmlRegionalPricing.ChildNodes.Item(i); if (_regionalprices.Length > 0) _regionalprices += ","; _regionalprices += _xmlRegion.Name + " : " + _xmlRegion.InnerText; } _message = "Category name:\t" + _xmlCategory.InnerText + "\n" + "Person in charge:\t" + _xmlPerson.InnerText + "\n" + "Regional Pricing:\t" + _regionalprices + "\n" + "Raw XML:\n" + _xmlDoc.OuterXml; MessageBox.Show(_message); } } _rdrObj.Close(); _connObj.Close(); _connObj.Dispose(); _connObj = null; } catch (Exception ex) { MessageBox.Show(ex.ToString()); } }

The DataGridView is packed full of events, including several navigation events that allow you to respond when the user moves from one cell to another, from one row to another, or abandons the control entirely. The event arguments indicate the relevant cell. Table 15-3 has more information.

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Enter fires when the user moves to the DataGridView from another control on the form, and Leave fires when the user heads to another control. These events fire when the user moves from one row to another. RowLeave also fires when the user clicks on another control on the form. These events fire when the user moves from one cell to another (regardless of whether or not the cell is in the same row). CellLeave also fires when the user clicks on another control on the form. The user selects a cell by clicking on it with the mouse. The currently selected cells have changed (usually the result of the user clicking with the mouse or moving with the arrow keys while holding Shift down, although the selection also can also be set programmatically).

Tip If you update the stereo panning every frame for a moving sprite, it will enhance the stereo effect.

If you run this code sample, you will see the message box shown in Figure 10-1 displaying the retrieved values of the individual XML elements.

Private Sub DrawRectangle(ByVal rect As Rectangle, ByVal g As Graphics) Dim squarePen As New Pen(Color.Red, 10) g.DrawRectangle(squarePen, rect) squarePen.Dispose() lblCount.Text = " " & squares.Count & " squares" End Sub A simpler solution is to use one of the overloaded versions on the Invalidate() method. This instructs Windows to repaint only a small portion of the window. The full painting code still runs (which could slow your application if the painting is complex), but only the specified region is repainted, thereby improving performance and drastically reducing screen flicker. Private Sub DrawSquare_MouseDown(ByVal sender As Object, _ ByVal e As System.Windows.Forms.MouseEventArgs) _ Handles MyBase.MouseDown Dim square As New Rectangle(e.X, e.Y, 20, 20) squares.Add(square) ' Get a region that includes the square and its border. ' Because the pen width is 10 pixels (and the center line is in ' the middle), you'll need an extra 5 pixels on each side. square.Inflate(5, 5) Invalidate(square) End Sub Finally, the last enhancement you can make is to modify the painting code to perform the repainting only if it falls in the invalidated region. You can determine the invalidated region by checking the PaintEventArgs.ClipRectangle property. For example, you could use conditional logic that paints the rectangle only if it falls into this region. In this situation, there isn t much performance benefit to be had because the step of painting the rectangle doesn t take much time (and the output isn t copied to the drawing surface anyway). However, if you need to perform a computationally intensive drawing task (for example, one that involves a gradient or a series of coordinate calculations), you can use this approach to avoid the work when it s not necessary.

You can also use ODP.NET s OracleXmlType class to receive data from an XMLTYPE column. In much the same way, you start off with an OracleDataReader object and then use its GetOracleXmlType method to return an OracleXmlType object.

Note Another way to paint just a portion of a window is to develop owner-drawn controls that override

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