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    <p>First, you need to check <code>Log</code> object for multithread support. If it works in main thread does not mean that it works in another thread well at same time. When work with multiple threads you always need to keep in mind about concurrency and other important rules. At least, may be you should place <code>Log</code> into <code>lock</code> statement (I don't know internal structure of your <code>Log</code> object).</p> <p>Second, don't think that <code>Log</code> not throws exceptions or exceptions don't exists inside <code>catch</code> block. Is quite possible that thread crashes here:</p> <pre><code> catch (Exception ex) { Log.Write("Worker exception : " + ex); } </code></pre> <p>Third, try simpliest and safest logging first for your debug purposes. Usually Windows Services logs their events into system journal. But it not well suited for debugging, it is rather a part of Service "interface". Try to use <code>Trace</code> class from <code>System.Diagnostics</code>.</p> <pre><code>using System.Diagnostics; ... catch (Exception ex) { Trace.WriteLine("Worker exception : " + ex); } </code></pre> <p><strong>For multithreaded applications you need more accurately write, verify and debug every step of your code before think that it works as expected. Multithreading in most cases significantly increases the complexity of development.</strong></p> <p>Creation of Service applications is also not a trivial task. For example using of forms in Services is strongly discouraged and complicates debugging.</p>
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Guidance
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.

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