string[] data = new[] { "One","Two" };

var t1 = data[0];

Console.WriteLine(t1);

var t2 = t1;
t2 = "Three"; //assigning the new value,and this should reflect in t1

Console.WriteLine(t2);
Console.WriteLine(t1); // this should print 'Three',but it prints 'One'

Console.Read();

http://msdn.microsoft.com/en-us/magazine/cc301755.aspx

Arrays are mechanisms that allow you to treat several items as a
single collection. The Microsoft® .NET Common Language Runtime (CLR)
supports single-dimensional arrays,multidimensional arrays,and
jagged arrays (arrays of arrays). All array types are implicitly
derived from System.Array,which itself is derived from System.Object.
This means that all arrays are always reference types which are
allocated on the managed heap,and your app’s variable contains a
reference to the array and not the array itself.

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