string[] strs = {"a", "b", "c", "d", "e" };
string[] newStrs = new string[strs.Length - 1];
for (int i = 0, j = 1; i < newStrs.Length; i++, j++)
{
newStrs[i] = strs[i] + strs[j];
}
for (int i = 0; i < newStrs.Length; i++)
{
Console.Write(newStrs[i] + "\t");
}
Console.Read();