Generate a upper case random guid string

below is a method for generate random string based on input length. just that the character in the random string has to be uppercase when return.

public static string GetRandomStringUsingGUID(int length)
    {
        // Get the GUID
        string guidResult = System.Guid.NewGuid().ToString();
        // Remove the hyphens
        guidResult = guidResult.Replace("-", String.Empty);
        
        // Make sure length is valid
        if (((length <= 0)
                    || (length > guidResult.Length)))
        {
            throw new ArgumentException(("Length must be between 1 and " + guidResult.Length));
        }
        // Return the first length bytes
        return guidResult.Substring(0, length);
    }

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