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2012-04-13T18:13:35.247
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2017-05-23T10:34:48.307
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there are a lot of events that could be used including <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.control.leave.aspx" rel="nofollow noreferrer"><code>Leave</code></a> Event which Occurs when the input focus leaves the DataGridView <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.cellleave.aspx" rel="nofollow noreferrer"><code>CellLeave</code></a> Event which Occurs when a cell loses input focus and is no longer the current cell <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.rowleave.aspx" rel="nofollow noreferrer"><code>RowLeave</code></a> Event which Occurs when a row loses input focus and is no longer the current row MSDN has info on each of the <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview_events.aspx" rel="nofollow noreferrer"><code>DataGridView Events</code></a> In the <code>Event</code> you use, you would place your code to perform the <code>UPDATE</code>. There are lots of answers on SO about updating the database: <a href="https://stackoverflow.com/questions/2623548/winforms-datagridview-update-database">WinForms DataGridView - update database</a> <a href="https://stackoverflow.com/questions/4051390/c-sharp-winforms-how-to-send-updates-from-datagridview-to-database">C# WinForms - how to send updates from DataGridView to DataBase</a> My suggestion would be try try some of this code and then if you have problems, post another question with your code. 
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1. POHow to use a c# datagridview to update a database file just like Access does?
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1. USTaryn
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.