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For example, you could take advantage of this context information to change the behavior of the DataGridView if the user is attempting to change focus to a different control on the form. In this case, it might be appropriate to simply display the error message in a status bar, but revert to the original value (rather than force the user to cancel the change or edit the value). To do this, you need to set the DataGridViewDataErrorEventArgs.Cancel property to False, as shown here: If (e.Context And GridViewDataErrorContexts.LeaveControl) = _ GridViewDataErrorContexts.LeaveControl Then e.Cancel = False End If

Extensible Stylesheet Language Transformations (XSLT) is yet another tool that you will need to be familiar with if you are going to manipulate XML data. XSLT is commonly used to transform the existing schema of an XML into a different one. For instance, let s consider your PRODUCT XML again:

# Free the textures we used glDeleteTextures(background_tex) glDeleteTextures(fugu_tex) if __name__ == "__main__": run()

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Validation is a slightly different task than error handling. With error handling, you deal with the problems reported by the data source. With validation, you catch your own custom error conditions for example, data that may be allowed in the data source, but doesn t make sense in your application. When the user commits a change by navigating to a new cell, the DataGridView control raises the CellValidating and CellValidated events. These are followed by the RowValidating and RowValidated events, which only occur when the user navigates to another row. You can respond to these events, check if the user-entered values are correct, and perform any required post-processing. If a value is invalid, you have a choice of how you want to respond.

The most intrusive approach is to stop the user with a message box. Here s an example: Private Sub dataGridView1_CellValidating(ByVal sender As Object, _ ByVal e As DataGridViewCellValidatingEventArgs) _ Handles dataGridView1.CellValidating ' Check if it's a column you want to validate. If dataGridView1.Columns(e.ColumnIndex).Name = "ProductImage" Then ' Apply the appropriate rule. If System.IO.Path.GetExtension(e.FormattedValue.ToString()) <> ".gif" Then ' There's a problem. Alert the user and cancel navigation. MessageBox.Show("Invalid product image.") e.Cancel = true End If End If End Sub By setting the Cancel property of the DataGridViewCellValidatingEventArgs object to True, you force the cell to stay in edit mode, so the invalid data is not committed to the underlying data source.

<CATEGORY>Engines</CATEGORY> <PERSON_IN_CHARGE>John Malcolm</PERSON_IN_CHARGE> <REGIONAL_PRICING> <EASTASIA>45.00</EASTASIA> <AMERICAS>20.00</AMERICAS> </REGIONAL_PRICING> </PRODUCT> This is all fine and dandy, but what if you wanted your schema to look like the following instead (so that it could be exported to some other system, for example).

Tip If you decide to use the aggressive message box approach, it may make sense to wait until the user

There are a few potential problems with blending if you use it heavily in a scene. When you render a blended polygon, it will still write information to the depth buffer, which OpenGL uses to keep background objects from overlapping foreground objects. The problem with this is that once a translucent polygon has been drawn, no more polygons can be drawn behind it. A good solution is to draw all the opaque polygons, then draw the translucent polygons from back to front so that the farthest away polygon is drawn first. Blended polygons also tend to take longer to render than opaque polygons, so if you find that your scene is rendering slowly, try reducing the number of translucent polygons.

has finished editing the entire row. Although this introduces the possibility of multiple errors, it also reduces the number of annoying message boxes that the user will see. To implement this approach, just respond to the RowValidating event instead of the CellValidating event, check every column of the current row, and present a message box with a bulleted list of all the problems you ve found.

<CategoryName>Engines</CategoryName> <EastAsianPrice>45.00</EastAsianPrice> <AmericaPrice>20.00</AmericaPrice> </ProductExtraInfo > You could either write code to iterate through the original XML using the XMLDocument class and then rebuild a new one element by element, or you could just use XSLT. XSLT allows you to define a set of mappings to convert the schema of an XML to a different one.

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