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    <p>You need to add a method body for </p> <pre><code>public ObjectComparer(string compareField, string direction); </code></pre> <p>I'd suggest that you do some research into abstract classes. <a href="http://msdn.microsoft.com/en-us/library/sf985hc5%28VS.71%29.aspx" rel="nofollow noreferrer">MSDN</a> is a good starting point, but a quick Google search will find you many sources of in depth information.</p> <hr> <p>Since the question has been reasonably answered I'll add some extra comments as the code you have been given looks quite broken.</p> <pre><code>using System.Web; using System.Runtime.CompilerServices; </code></pre> <p>These seem to be a odd couple of namespaces to be using in a comparer (especially the second), is this class from a larger file and you haven't got all of it, or is it just left over legacy code?</p> <hr> <pre><code>public ObjectComparer(string compareField, string direction); </code></pre> <p>I'm guessing the constructor should be setting up the properties like this?</p> <pre><code>public ObjectComparer(string compareField, string direction) { CompareField = compareField; Direction = direction; } </code></pre> <hr> <pre><code>public string Direction { get { return compareField; } set { compareField = value;} } </code></pre> <p>I think this should have it's own backing field. Seems strange that it will always be the same as CompareField.</p> <hr> <p>I don't mean to be rude, but just getting past that error won't make this class work. You really need to understand what it is you are trying to do and how a class like this may help you do it. (If you know all this and just didn't understand the error then I apologise)</p>
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    1. POMust declare a body becase it is not marked abstract, extern or partial
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    1. USMartin Harris
    1. USMartin Harris
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    1. POMust declare a body becase it is not marked abstract, extern or partial
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    1. COyou mean he needs a body for the /abstract/ method "int Compare(T x, T y)...? ;)
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      1. USAllenG
    2. CO@AllenG - No, he doesn't mean that. You can't have an abstract function with a body. That's the whole reason for having an abstract method, to force subclasses to implement their own.
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      1. USfletcher
    3. CO@fletcher - I mistyped the answer first to include the Compare method as an error not noticing that it was abstract. Fortunately I fixed it within the edit window and now the only evidence of my foolishness is Allen's comment and this admission.
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