How to get number of UPPER case letters in a string in C#?

 Here i am using LINQ to get number of uppercase letters within a string,this countUpperLetters method takes the string as parameter and returns number of uppercase letters on it.
    /// <summary>
        /// Function Name:countUpperLetters
        /// Bishnu Tewary
        /// 10-09-2013
        /// this countUpperLetters method takes the string as parameter
        /// and returns number of   uppercase   letters on it.
        /// </summary>
        /// <param name="strString">string parameter for which
        ///  uppercase letters will be counted
        /// </param>
        /// <returns>int , number of uppercase letteres</returns>
        public static int countUpperLetters(string strString)
        {
            return strString.Count(c => char.IsUpper(c));
        }

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