Microsoft.Azure.Commands.StreamAnalytics.StreamAnalyticsCommonUtilities.ExtractResourceGroupFromId C# (CSharp) Method

        public static string ExtractResourceGroupFromId(string jobCSMId)
        {
            if (string.IsNullOrWhiteSpace(jobCSMId))
            {
                throw new ArgumentNullException("jobCSMId");
            }

            int startIndex = jobCSMId.IndexOf("/resourceGroups/", StringComparison.OrdinalIgnoreCase);
            if (startIndex < 0)
            {
                throw new ArgumentException("id must contain \"/resourceGroups/\"", "jobCSMId");
            }

            startIndex += "/resourceGroups/".Length;

            int endIndex = jobCSMId.IndexOf("/", startIndex, StringComparison.OrdinalIgnoreCase);
            if (endIndex < 0)
            {
                throw new ArgumentException("id must contain \"/\"  after \"/resourceGroups/\"", "jobCSMId");
            }

            return jobCSMId.Substring(startIndex, endIndex - startIndex);
        }
    }