Detect if a string contains uppercase characters

Question

Is there an alternative to using a regular expression to detect if a string contains uppercase characters? Currently I\'m using the following regular expression:

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Answer 1

Using LINQ might have an impact on performance when using a large string . You can also use ASCII level comparison.

byte[] asciiBytes = Encoding.ASCII.GetBytes(fullUri);
for (int i = 0; i < asciiBytes.Length; i++)
{
    if (asciiBytes[i] > 64 && asciiBytes[i] < 91)
    {
        return true;
    }
}