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the DataGridViewImageColumn to display a generic image next to every row just to improve the appearance of the control. The next example demonstrates this technique with a column that shows a starburst icon next to new or modified rows. First of all, define the images that you want to use as form member variables, so that they are available to all event-handling code: Private genericImage As Image Private newImage As Image When the application first loads, you can configure these images by loading them from a file or, more practically, by retrieving the image from an embedded resource or an ImageList: genericImage = imageList.Images(1) newImage = imageList.Images(0) Next, create the image column. In this example, the image column is in the leftmost position of the DataGridView, and always shows the default genericImage: ' Bind the grid. dataGridView1.DataSource = Program.StoreDB.GetProducts() ' Create the image column. Dim imageCol As New DataGridViewImageColumn() imageCol.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter imageCol.ImageLayout = DataGridViewImageCellLayout.Normal imageCol.Frozen = True imageCol.Name = "Image" imageCol.HeaderText = "" ' Move the column to the left, and move the ProductID ' column out of the way. imageCol.DisplayIndex = 0 dataGridView1.Columns("ProductID").DisplayIndex = 1 ' By default, show the generic image. imageCol.Image = genericImage ' Add the image column to the grid. dataGridView1.Columns.Add(imageCol) Finally, you can respond to the CellValueChanged event, and update the image to show that the row has been modified. In a more sophisticated scenario, you might want to check other criteria for the modified row before deciding how to change the image. Private Sub dataGridView1_CellValueChanged(ByVal sender As Object, _ ByVal e As DataGridViewCellEventArgs) _ Handles dataGridView1.CellValueChanged

If e.RowIndex <> -1 Then ' Retrieve the image column for this row. Dim col As DataGridViewImageCell = CType( _ dataGridView1.Rows(e.RowIndex).Cells("Image"), _ DataGridViewImageCell) ' Set the image. col.Value = newImage End If End Sub Figure 15-11 shows the DataGridView with two modified rows. Note that the DataGridView correctly handles background selection, changing the color of the image background appropriately. This works because the ImageList control defines the background color as transparent using the TransparentColor property.

private void btnInsertProdInfo_Click(object sender, EventArgs e)

Tip Unfortunately, the DataGridView doesn t have any built-in way to show both image content and text in

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If you are not lucky enough to be blessed with musical talent, you may have to use music that someone else has created. There are a number of stock music web sites where you can purchase music files for use in games or download them for free. You can find a selection of both commercial and free music sites on the Pygame wiki (www.pygame.org/wiki/resources).

a single cell. However, you can easily add this ability using custom painting, as described later in this chapter.

{ string _connstring = "Data Source=localhost/NEWDB;User Id=EDZEHOO;Password=PASS123;"; try { OracleConnection _connObj = new OracleConnection(_connstring); _connObj.Open(); OracleCommand _cmdObj = new OracleCommand("proc_InsertProdInfo", _connObj); _cmdObj.CommandType = CommandType.StoredProcedure; //Define first input parameter OracleParameter _ProductIDParam = new OracleParameter("ProductID", OracleDbType.Varchar2); _ProductIDParam.Value = "W1"; _cmdObj.Parameters.Add(_ProductIDParam); //Define the second input parameter OracleParameter _ProductInfoParam = new OracleParameter("ProductInfo", OracleDbType.XmlType); OracleXmlType _ProductInfoXML = new OracleXmlType(_connObj, "<PRODUCT><CATEGORY>Accessories</CATEGORY><PERSON_IN_CHARGE>Mary Sabbath</PERSON_IN_CHARGE><REGIONAL_PRICING><EASTASIA>3.00 </EASTASIA><AMERICAS>8.00</AMERICAS></REGIONAL_PRICING></PRODUCT>"); _ProductInfoParam.Value = _ProductInfoXML; _cmdObj.Parameters.Add(_ProductInfoParam); _cmdObj.ExecuteNonQuery(); _connObj.Close(); _connObj.Dispose(); _connObj = null; MessageBox.Show("Product inserted"); } catch (Exception ex) { MessageBox.Show(ex.ToString()); } }

A more sophisticated way to use image columns is to display picture data that relates to an actual record. There are two ways to do this. The simple approach requires no extra code, and takes place automatically if you are showing a column that has the Image data type. For example, consider the pub_info table in the pubs sample database that s included with all installations of SQL Server. It includes a logo field that holds a 16-byte picture. If you retrieve this information and bind it to a DataGridView, the DataGridView automatically uses a DataGridViewImageColumn to show it.

However, displaying an image isn t always this easy Sometimes, you might need your code to explicitly translate the binary data in a portion of a binary column to create the picture Or, your database record might simply store the file name of the image file you want to show In these cases, you need an extra manual step, where your code must retrieve and supply the required data To implement this design, you need to respond to the CellFormatting event In this event, you set the Image object for the cell You can create this Image object based on binary data in the database, or using a filename specified in another field, which is the approach we ll use in the next example with the Products table The Products table includes a ProductImage field that specifies the file name for a picture of the product.

XML represents not just data but also schema (the structure of the data). However, the Oracle database does not automatically check the validity of incoming XML that you store in a column. The responsibility of ensuring that a given XML document conforms to its schema falls to you. For instance, consider the following XML:

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