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The first programs, first Timer are used to control the rotation interval five random numbers. Then the event associated with the Enter key, key control program Enter the rotation of the beginning and end of functions. Ultimately I have to connect to the database, so that based on the selected number of names corresponding to pull from the database and displayed on the screen. A second more comprehensive programs involve the knowledge, including Explorer and browsing of implementation, will import the contents of the Excel tables in the DataGridView control, find out in line with the meaning of extraction methods, will export the contents of a DataGridView control to an Excel table and save, and so on. But most important of all was simple, practical method of extraction.
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