What Does The 0 Stand For In Encoding.ASCII.GetBytes (str) [0]?

Jan 20, 2010

,What does the [0] in this code stand for ?I know the line gets the number of bytes in the ASCII characters, if its less than 91 and greater than 64.But why the [0] string str = strs[i];
if (Encoding.ASCII.GetBytes(str)[0] <= 64 || Encoding.ASCII.GetBytes(str)[0] >= 91)
{
Console.WriteLine(Encoding.ASCII.GetBytes(str)[0].ToString());
}
else if (Encoding.ASCII.GetBytes(str)[0] != 88)
{
Console.WriteLine(str);
}

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