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copied!<p>Your issue here might be that you are confusing the notions of students and names. By defining the <code>Student</code> struct, you are creating an entity that can represent more than a mere name. You could, for example, extend it to include <code>Age</code>, <code>Hometown</code>, and so forth. (For this reason, it might be more meaningful to name your array <code>students</code> rather than <code>names</code>.)</p> <pre><code>struct Student { public string Name; public int Age; public string Hometown; } </code></pre> <p>Given the possibility of multiple fields, the <code>Array.Sort</code> method needs to know what you want to sort your list upon. Do you want students ordered by name, by age, or by hometown?</p> <p>Per the MSDN documentation on <a href="http://msdn.microsoft.com/en-us/library/kwx6zbd4.aspx" rel="nofollow"><code>Array.Sort<T></code></a>:</p> <blockquote> <p>Sorts the elements in an entire <code>Array</code> using the <code>IComparable<T></code> generic interface implementation of each element of the Array.</p> </blockquote> <p>This means that the type you are attempting to sort – in your case, <code>Student</code> – must implement the <a href="http://msdn.microsoft.com/en-us/library/4d7sx9hd.aspx" rel="nofollow"><code>IComparable<T></code></a> interface, in order for the <code>Array.Sort</code> implementation to know how it should compare two <code>Student</code> instances. If you're convinced that students will always be sorted by name, you could implement it like so:</p> <pre><code>struct Student : IComparable<Student> { public string Name; public int Age; public string Hometown; public int CompareTo(Student other) { return String.Compare(this.Name, other.Name); } } </code></pre> <p>Alternatively, you could provide a function that extracts the sort key to the sort method itself. The easiest way of achieving this is through the LINQ <code>OrderBy</code> method:</p> <pre><code>names = names.OrderBy(s => s.Name).ToArray(); </code></pre>

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