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The ControlPaint class offers methods for drawing standard Windows interface elements, like scroll buttons, borders, focus rectangles, and check boxes. For example, if you want to create a special control that contains a list of items with check boxes, you have limited options. You can use control composition (and create contained check-box controls), but this limits the ways that you can use the check boxes and tailor the interface. Alternatively, you could attempt to draw your own and probably end up with a rather crude-looking square. With the ControlPaint class, however, you can use the DrawCheckBox() method, and end up with the perfectly shaded Windows standard for free. You can even create a check box of any size you like. Similarly, if you want to create a scroll button, or a button that displays a focus rectangle, you also can turn to the ControlPaint class. The ControlPaint class consists entirely of shared methods, as described in Table 7-6. Here s a line of code that uses it draw a check box: ControlPaint.DrawCheckBox(e.Graphics, New Rectangle(10, 10, 50, 50), _ ButtonState.Checked) And here s one that draws the familiar dotted focus rectangle: ControlPaint.DrawFocusRectangle(e.Graphics, new Rectangle(130, 80, 20, 20))

private void btnValidateXML_Click(object sender, EventArgs e)

Ordinarily, when the user begins adding a new row, the values of that new row are filled in with any defaults defined in the data source. (For example, if you re binding to a custom data object that sets certain defaults in its constructor, the constructor determines what text appears in the fields.)

def run(): pygame.init() screen = pygame.display.set_mode(SCREEN_SIZE, HWSURFACE|OPENGL|DOUBLEBUF)

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However, in many cases, you need a more flexible, decoupled approach that allows you to set defaults that apply only to the DataGridView. This is actually quite easy to accomplish all you need to do is handle the DefaultValuesNeeded event. The DefaultValuesNeeded event supplies you with the appropriate DataGridView row object. You simply need to fill in each of the fields. Here s an example: Private Sub dataGridView1_DefaultValuesNeeded(ByVal sender As Object, _ ByVal e As System.Windows.Forms.DataGridViewRowEventArgs) _ Handles dataGridView1.DefaultValuesNeeded e.Row.Cells("ProductID").Value = Guid.NewGuid.ToString() e.Row.Cells("ModelName").Value = "(Enter Name)" e.Row.Cells("Image").Value = "noimage.gif" ... End Sub Incidentally, you also can supply default formatting for new cells. Just set the properties of the DataGridView.RowTemplate object. Any property values you don t set are inherited from the styles associated with the corresponding DataGridViewColumn and the DataGridView.

{ string _connstring = "Data Source=localhost/NEWDB;User Id=EDZEHOO;Password=PASS123;"; try { OracleConnection _connObj = new OracleConnection(_connstring); _connObj.Open(); string _data = ""; _data = "<PRODUCT xmlns=\"PRODUCT.xsd\">" + " <CATEGORY>Slipspace drives</CATEGORY>" + " <PERSON_IN_CHARGE>Fujikawa</PERSON_IN_CHARGE>" + " <REGIONAL_PRICING>" + " <EASTASIA>5000</EASTASIA>" + " <AMERICAS>8000</AMERICAS>" + " </REGIONAL_PRICING> " + "</PRODUCT>"; OracleXmlType _oracleXmlType = new OracleXmlType(_connObj, _data); MessageBox.Show("Validation result is : " + _oracleXmlType.Validate("PRODUCT.xsd")); _connObj.Close(); _connObj.Dispose(); _connObj = null; } catch (Exception ex) { MessageBox.Show(ex.ToString()); } } If you run the preceding code, you will notice that it first returns true, indicating that the XML data conforms to the schema. Now, try changing the XML data slightly; intentionally misspell or remove one of the tags (as highlighted in bold):

By default, the DataGridViewTextBoxColumn allows users to enter any characters, including those that might not be allowed in the current cell. For example, a user might type non-numeric characters in a numeric field, or specify a value that violates a ForeignKeyConstraint or UniqueConstraint defined in the DataSet. The DataGridView handles these problems in different ways: If the edited value can be converted into the required data type (for example, the user has typed text into a numeric column), the user won t be able to commit the change or navigate to another row. Instead, the change must be cancelled, or the value must be edited. If the editing attempt causes an exception, the change will be cancelled immediately after the user attempts to commit it by navigating to another row or pressing Enter. Exceptions can be thrown from the property procedure code of a bound object or generated if you violate a constraint in a bound DataTable. These common sense defaults work well for most scenarios. However, if necessary, you also can participate in the handling of errors by responding to the DataGridView.DataError event, which fires when the DataGridView intercepts an error from the data source (for example, entering a string instead of a number or violating a constraint in the underlying DataTable). For example, the following DataError event handler catches both of the errors described above when the user edits the CategoryID field of the Products table: Private Sub dataGridView1_DataError(ByVal sender As Object, _ ByVal e As DataGridViewDataErrorEventArgs) _ Handles dataGridView1.DataError ' Check if it's an error during the commit stage. If (e.Context And DataGridViewDataErrorContexts.Commit) = _ DataGridViewDataErrorContexts.Commit Then

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