StackOverflow2013

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4545760
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0
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2010-12-28T11:42:01.187
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2010-12-28T11:42:01.187
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8521
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4545692
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2
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3
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Since Max() requires at least one element in its sequence you either have to <ul> <li>catch the exception and set max to zero</li> <li>check the length before calling Max(). I'd recommend this</li> </ul> While it is possible to write the logic in one long query expression, I'd recommend you break it up a bit to improve readability. Create a method that returns the integer part of a child control's name: <pre><code>private int NumberFromElementName(string name) { // Or search for the last '_' using name.LastIndexOf() var numString = name.Substring("Control_".Length); return Int32.Parse(numString); } </code></pre> Then do the query in two steps to allow you to look at the length of the returned sequence. Notice I convert it to an array to avoid having to run the query twice. I'm also using the <a href="http://msdn.microsoft.com/en-us/library/bb360913.aspx" rel="nofollow">OfType</a> extension method so that it works even if the canvas has a child which isn't of type FrameworkElement. <pre><code>var children = canvas1.Children.OfType<FrameworkElement>().ToArray(); int max = 0; if (children.Length > 0) max = children.Max(x => NumberFromElementName(x.Name)); string nextChildName = String.Format ("Control_{0}", max + 1); </code></pre> EDIT: As pointed out by @Jan in his answer, you can avoid splitting the query in two parts by using the <a href="http://msdn.microsoft.com/en-us/library/bb355419.aspx" rel="nofollow">DefaultIfEmpty</a> before the Max call in the query.
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1. POLambda expression to return zero if null
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1. USIsak Savo
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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.