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  1. PO
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    <p>The ForEach extension method usually isn't worth the bother.</p> <p><a href="http://blogs.msdn.com/ericlippert/archive/2009/05/18/foreach-vs-foreach.aspx" rel="nofollow noreferrer">Eric Lippert has blogged about it</a>, and his philosophical objection to it is that it looks like a side-effect free expression (like most Linq features) but it is actually a side-effecting imperative statement in disguise.</p> <p>If you want to carry out an action for each item on a list, use the foreach statement. That's what it's for.</p> <p>If you want to manipulate lists of actions, then you can do that, but then you want <code>IEnumerable&lt;Action&gt;</code>.</p> <p>For the first part of your code, how about:</p> <pre><code>var errorList = GetResultRows().Where(row =&gt; row.Field&lt;string&gt;("status").Equals("FAILURE", StringComparison.InvariantCultureIgnoreCase) .ToList(); </code></pre> <p>You have a <code>List&lt;string&gt;</code> called excluded books. Use <code>HashSet&lt;string&gt;</code> instead, and you don't need to check if a string is already added to it:</p> <pre><code>var excludedBooks = new HashSet&lt;string&gt;(); foreach (DataRow row in errorList) { if (ToUseBooksList.Contains((string)row["main_book"])) { BookCheckResults.AddRow(string.Format("Error for MainBook {0}, RiskType {1}", row["main_book"], row["risk_type"])); excludedBooks.Add((string)row["main_book"]); } } </code></pre> <p>You can also filter the list with <code>Where</code>:</p> <pre><code>var excludedBooks = new HashSet&lt;string&gt;(); foreach (DataRow row in errorList.Where(r =&gt; ToUseBooksList.Contains((string)r["main_book"])) { BookCheckResults.AddRow(string.Format("Error for MainBook {0}, RiskType {1}", row["main_book"], row["risk_type"])); excludedBooks.Add((string)row["main_book"]); } </code></pre>
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    1. POHow to Remove unneccessary list using lambda and functional C# paradigm
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    1. USDaniel Earwicker
    1. USDaniel Earwicker
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    1. POHow to Remove unneccessary list using lambda and functional C# paradigm
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    1. COHi Earwicker, you dont have Where linq extension available on IEnumerable<DataRow> hence my own filter. Can you explain how do you get Where extension of IEnumerable<DataRow> ?
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      1. USnetmatrix01
    2. COExtension methods are defined in classes, and classes are defined in namespaces. To make the compiler find an extension method, you need to put a using directive at the top of your source file for the namespace of the class containing the extension method. In this case: `using System.Linq;`
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