generate barcode c# For more information, please see the source code provided with this book. in .NET

Generate QR in .NET For more information, please see the source code provided with this book.

For more information, please see the source code provided with this book.
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Windows Forms Controls
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Figure 16-24 A DataGrid that uses a custom column style created with the DataGridControlStyle class provided in the companion code
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Other Useful Objects
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The System.Windows.Forms namespace contains many other objects that you ll surely need to know about for creating full-featured Win32 applications.
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The Clipboard Object
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As you can easily guess, the Clipboard object gives you the ability to copy data to the Clipboard and then paste it somewhere else.
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Copying Data to the Clipboard
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Copying a piece of information to the Clipboard is as easy as calling Clipboard.SetDataObject. You can pass this method a string, an image, and so on. If you pass it a string that contains text in Rich Text Format (RTF), the Clipboard object detects this format automatically. For example, the following procedure copies the selected portion of a TextBox control (or the entire control s contents if no text is selected) to the Clipboard:
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Sub CopyFromTextBox(ByVal tb As TextBox) Copy the TextBox s selected text to the Clipboard. Dim text As String = tb.SelectedText Copy the entire text if no text is selected. If text.Length = 0 Then text = tb.Text Proceed only if there is something to be copied. If text.Length > 0 Then Clipboard.SetDataObject(text) End If End Sub
The SetDataObject method can take a second argument, which you should set to True if you want to make the copied object available after the current program terminates:
Clipboard.SetDataObject(text, True)
Part IV:
Win32 Applications
Remember that you can store any object to the Clipboard, including objects that are private to your application and that shouldn t be accessed by other programs. (Only serializable objects can be stored to the Clipboard.) The Clipboard object supports several formats, each identified by a string constant exposed by the DataFormats class. The list includes common formats, such as Text, Rtf, Html, Bitmap, MetafilePict, EnhancedMetafile, Tiff, and Palette. There is also a Com maSeparatedValue format that lets you import data in CSV format from spreadsheets and many other applications. If a control can export data in multiple formats, it should call the SetDataObject method once for each format. For example, a RichTextBox con trol should copy the value of both the SelectedRtf and SelectedText properties so that its contents can be pasted in either a TextBox or a RichTextBox control. While the SetDataObject method can understand a few formats automatically, it doesn t give you full control over the format used to store the data to the Clipboard. For a higher degree of control, you must create a new instance of DataObject, a class that works as a storage medium for data in different formats. Next you should call DataOb ject s SetData method once for every format you want to support, and you should use the Clipboard.SetDataObject method to store the DataObject object to the Clipboard:
Sub CopyFromRichTextBox(ByVal rtf As RichTextBox) Copy the RichTextBox s selected text to the Clipboard. Dim data As New DataObject() Get the selected RTF text if there is a selection or the entire text if no text is selected. Dim text As String = rtf.SelectedRtf If text.Length = 0 Then text = rtf.Rtf Do the copy only if there is something to be copied. If text.Length > 0 Then data.SetData(DataFormats.Rtf, text) Do it again with the plaintext.
text = rtf.SelectedText
If text.Length = 0 Then text = rtf.Text
Proceed only if there is something to be copied.
If text.Length > 0 Then
data.SetData(DataFormats.Text, text) End If Move the DataObject into the Clipboard. (Pass True to make the data available to other applications.) Clipboard.SetDataObject(data, True) End Sub
The first argument in the SetData method can be any string, including a user-defined string that defines a custom format. This lets you create private Clipboard formats that only your application can understand. The DataObject class is usually used in conjunction with the Clipboard, but it doesn t have to be so. For example, you can use it as a temporary repository for your data in multiple formats. It s like having as many private Clipboards as you need.
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