.Net - Frequently Asked Questions
Difference between System.Array.CopyTo and System.Array.Clone()
The System.Array.CopyTo method copies the elements into another pre-existing array starting from a given index. In this case the destination array need to already exist. More over, the target Object needs to be sufficient to hold all the elements in the source array from the index you specify as the destination. When perform CopyTo() method both arrays must be single dimensional.
The System.Array.Clone() method returns a new array object, which means that the destination array need not exist yet since a new one is created from scratch with containing all the elements in the original array. The Clone() method works on both single and multi-dimensional arrays.
Performance wise System.Array.CopyTo is faster than Clone when copying to array of same type.
Shallow copy and Deep copy

Array Example
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