Count letters

string text = Console.ReadLine();

int upperCount = 0;
int lowerCount = 0;
int spaceCount = 0;

foreach (char c in text)
{
    if (char.IsUpper(c))
        upperCount++;
    else if (char.IsLower(c))
        lowerCount++;
    else if (char.IsWhiteSpace(c))
        spaceCount++;
}

Console.WriteLine(upperCount);
Console.WriteLine(lowerCount);
Console.WriteLine(spaceCount);