IsGuid

        /// <summary>
        /// Converts the string representation of a Guid to its Guid 
        /// equivalent. A return value indicates whether the operation 
        /// succeeded. 
        /// </summary>
        /// <param name="s">A string containing a Guid to convert.</param>
        /// <param name="result">
        /// When this method returns, contains the Guid value equivalent to 
        /// the Guid contained in <paramref name="s"/>, if the conversion 
        /// succeeded, or <see cref="Guid.Empty"/> if the conversion failed. 
        /// The conversion fails if the <paramref name="s"/> parameter is a 
        /// <see langword="null" /> reference (<see langword="Nothing" /> in 
        /// Visual Basic), or is not of the correct format. 
        /// </param>
        /// <value>
        /// <see langword="true" /> if <paramref name="s"/> was converted 
        /// successfully; otherwise, <see langword="false" />.
        /// </value>
        /// <exception cref="ArgumentNullException">
        ///        Thrown if <pararef name="s"/> is <see langword="null"/>.
        /// </exception>
        /// <remarks>
        /// Original code at https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=94072&wa=wsignin1.0#tabs
        /// 
        /// </remarks>
        public static bool IsGuid(this string s)
        {
            if (s == null)
                throw new ArgumentNullException("s");

            Regex format = new Regex(
                "^[A-Fa-f0-9]{32}$|" +
                "^({|\\()?[A-Fa-f0-9]{8}-([A-Fa-f0-9]{4}-){3}[A-Fa-f0-9]{12}(}|\\))?$|" +
                "^({)?[0xA-Fa-f0-9]{3,10}(, {0,1}[0xA-Fa-f0-9]{3,6}){2}, {0,1}({)([0xA-Fa-f0-9]{3,4}, {0,1}){7}[0xA-Fa-f0-9]{3,4}(}})$");
            Match match = format.Match(s);

            return match.Success;
        }
Example:
string s = Guid.NewGuid().ToString();

Assert.IsTrue(s.IsGuid());

Description

Checks to see if a string represents a valid GUID. Source of the function: Original code at https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=94072&wa=wsignin1.0#tabs

Details

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