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string[] s3 = new string[s1.Length + s2.Length];
Array.Copy(s1, 0, s3, 0, s1.Length);
Array.Copy(s2, 0, s3, s1.Length, s2.Length);
int[] a = { 1, 2, 3 };
int[] b = { 4, 5, 6 };
List<int> list = new List<int>();
list.AddRange(a);
list.AddRange(b);
foreach (int i in list)
{
Console.WriteLine(i);
}
string[] s3 = new string[s1.Length + s2.Length];
Array.Copy(s1, 0, s3, 0, s1.Length);
Array.Copy(s2, 0, s3, s1.Length, s2.Length);