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On line 5, I recommend you cast the type using the <a href="https://docs.microsoft.com/en-us/dotnet/api/system.linq.enumerable.cast?view=net-6.0" rel="ugc">Cast&lt;&gt;</a> method, which will cast to the type object accordingly. Despite that, it looks like (according to this snippet) that <strong>obr</strong> and <strong>member</strong> don't point to any data structure in memory. Could that be why?
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Richard

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<p>What is wrong with this linq statement?</p><pre><code class="code-1 nolinks" id="code-10-29242790-1"><span>private List&lt;OnBoard&gt; onboards = new List&lt;OnBoard&gt;(); </span>
<span>public OnBoard obr; </span>
<span>public Member member;</span>
<span> </span>
<span>onboards = (List&lt;OnBoard&gt;)db.OnBoards.ToList(); </span>
<span>var result = from obr in onboards where obr.MemberId == member.MemberId select obr; &nbsp; </span>
</code></pre><p>This compiles and executes with no errors, but obr is null after execution when onboards contains 500+ records and one does matches the requirements of the test (where obr.memberID == member.MemberID). &nbsp;Right now there is only one record which matches.</p><p><br></p><p><br></p><p><br></p>
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What is wrong with this linq statement?
private List<OnBoard> onboards = new List<OnBoard>(); 
public OnBoard obr; 
public Member member;
 
onboards = (List<OnBoard>)db.OnBoards.ToList(); 
var result = from obr in onboards where obr.MemberId == member.MemberId select obr;  
This compiles and executes with no errors, but obr is null after execution when onboards contains 500+ records and one does matches the requirements of the test (where obr.memberID == member.MemberID).  Right now there is only one record which matches.

What is wrong with this linq statement?

Language Integrated Query (LINQ) is a Microsoft .NET Framework component that adds native data querying capabilities to .NET languages, although ports exist for Java, PHP, JavaScript and ActionScript. LINQ extends the language by the addition of query expressions, which are akin to SQL statements, and can be used to conveniently extract and process data from arrays, enumerable classes, XML documents, relational databases, and third-party data sources.

LINQ Query

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).