• Return to Home Page
    • Solutions
      Industries
      • Academic and Research
      • Aerospace, Defense, and Government
      • Electronics
      • Energy
      • Industrial Machinery
      • Life Sciences
      • Semiconductor
      • Transportation
      Product Life Cycles
      • Design and Prototype
      • Validation
      • Production
      Focus Areas
      • 5G and 6G Technology
      • ADAS and Autonomous Driving Testing
      • Artificial Intelligence
      • Electric Vehicle Test
      • Lifecycle Analytics
      • Radar and Electronic Warfare
      • Space Launch and Exploration
      • Validation Lab Innovations
      See our approach to solutions
      Get a Helping Hand
      From troubleshooting technical issues and product recommendations, to quotes and orders, we’re here to help.
      Contact Us
    • Products
      Software
      View All Software
      Test Automation
      • LabVIEW
      • LabVIEW+ Suite
      • TestStand (Test Execution)
      • VeriStand (HIL Test Development)
      Free Interactive Test Software
      • FlexLogger (for DAQ hardware)
      • InstrumentStudio (for PXI hardware)
      Test Analytics and Operations
      • DIAdem (for Analysis and Visualization)
      • SystemLink (Test Operations)
      • OptimalPlus (Manufacturing Analytics)
      SERVICES
      View All Services
      • Repair Services
      • Calibration
      • Training Courses
      HARDWARE
      View All Hardware
      Data Acquisition and Sensor I/O
      • Learn About DAQ
      • Multifunction I/O
      • Voltage
      • Digital I/O
      • Sound and Vibration
      • Temperature
      • Current
      • Strain, Pressure, and Force
      Communication Interfaces and Instrument Control
      • GPIB, Serial, and Ethernet
      • Vehicle Communication Buses
      • Industrial Communication Buses
      • Avionics Communication Buses
      Instruments
      • Oscilloscopes
      • Switches
      • SMUs
      • LCR Meters
      • Digital Multimeters
      • Electronic Loads
      • Power Supplies
      • Waveform Generators
      • FlexRIO Instruments
      • Switch Load Signal Conditioning
      RF & Wireless
      • Software Defined Radios
      • RF Analog Signal Generators
      • Vector Network Analyzers
      • Vector Signal Generators, Analyzers, and Transceivers
      Accessories
      • Browse Accessories
      RESOURCES
      • Ordering Resources
      • Distributors
      • System Advisors
      See all products
      CompactDAQ

      Modular Data Acquisition

      CompactRIO

      Distributed Measurement and Control

      PXI

      High-Performance Test

      LabVIEW+ Suite

      Automated Test System Development Software

    • Perspectives
      Perspectives

      Perspectives showcases how NI sees what’s next in the world of test and technology.

      View all articles
      Charting the Course for Test Development with LabVIEW
      LabVIEW remains key in test, promising speed, efficiency, and new features with NI’s investment in core tech, community, and integration.
      Read our featured article
    • Support
      Resources
      View All Support Resources
      • Software Downloads
      • Register and Activate
      • Product Documentation
      • Release Notes
      • Training Courses
      • On-Demand Learning
      • KnowledgeBase
      • Code Examples
      Request Support

      You can request repair, RMA, schedule calibration, or get technical support. A valid service agreement may be required.

      Open a service request
      Popular Software Downloads
      See all Software Product Downloads
      icon of LabVIEW logo
      LabVIEW
      icon of Multisim logo
      Multisim
      icon of Academic Volume License logo
      Academic Volume License
      Popular Driver Downloads
      See all Driver Software Downloads
      • NI-DAQmx

        Provides support for NI data acquisition and signal conditioning devices. 

      • NI-VISA

        Provides support for Ethernet, GPIB, serial, USB, and other types of instruments. 

      • NI-488.2

        Provides support for NI GPIB controllers and NI embedded controllers with GPIB ports. 

    • Community
    • Partners
    • Contact UsFlag
    • My Account
    • Search
  • Cart
    • Solutions
      • Back
      • Industries
      • Academic and Research
      • Aerospace, Defense, and Government
      • Electronics
      • Energy
      • Industrial Machinery
      • Life Sciences
      • Semiconductor
      • Transportation
      • Product Life Cycles
      • Design and Prototype
      • Validation
      • Production
      • Focus Areas
      • 5G and 6G Technology
      • ADAS and Autonomous Driving Testing
      • Artificial Intelligence
      • Electric Vehicle Test
      • Lifecycle Analytics
      • Radar and Electronic Warfare
      • Space Launch and Exploration
      • Validation Lab Innovations
      • See our approach to solutions
    • Products
      • Back
      • Software
      • View All Software
      • Test Automation
      • LabVIEW
      • LabVIEW+ Suite
      • TestStand (Test Execution)
      • VeriStand (HIL Test Development)
      • Free Interactive Test Software
      • FlexLogger (for DAQ hardware)
      • InstrumentStudio (for PXI hardware)
      • Test Analytics and Operations
      • DIAdem (for Analysis and Visualization)
      • SystemLink (Test Operations)
      • OptimalPlus (Manufacturing Analytics)
      • SERVICES
      • View All Services
      • Repair Services
      • Calibration
      • Training Courses
      • HARDWARE
      • View All Hardware
      • Data Acquisition and Sensor I/O
      • Learn About DAQ
      • Multifunction I/O
      • Voltage
      • Digital I/O
      • Sound and Vibration
      • Temperature
      • Current
      • Strain, Pressure, and Force
      • Communication Interfaces and Instrument Control
      • GPIB, Serial, and Ethernet
      • Vehicle Communication Buses
      • Industrial Communication Buses
      • Avionics Communication Buses
      • Instruments
      • Oscilloscopes
      • Switches
      • SMUs
      • LCR Meters
      • Digital Multimeters
      • Electronic Loads
      • Power Supplies
      • Waveform Generators
      • FlexRIO Instruments
      • Switch Load Signal Conditioning
      • Accessories
      • Browse Accessories
      • RESOURCES
      • Ordering Resources
      • Distributors
      • System Advisors
      • See all products
    • Perspectives
    • Support
      • Back
      • Resources
      • View All Support Resources
      • Software Downloads
      • Register and Activate
      • Product Documentation
      • Release Notes
      • Training Courses
      • On-Demand Learning
      • KnowledgeBase
      • Code Examples
      • Popular Software Downloads
      • See all Software Product Downloads
      • icon of LabVIEW logo
      • icon of Multisim logo
      • icon of Academic Volume License logo
      • Popular Driver Downloads
      • See all Driver Software Downloads
      • NI-DAQmx
      • NI-VISA
      • NI-488.2
      • Request Support
      • You can request repair, RMA, schedule calibration, or get technical support. A valid service agreement may be required.Open a service request
    • Community
    • Partners
    • Contact Us
    • Account
Skip to main contentSkip to search
Product Documentation - NIProduct Documentation - NI
Product Documentation - NI
  • Home
  • All Manuals
  • Log in

TestStand API Reference

Table of Contents
  • TestStand API Reference
  • TestStand Programming Reference Manual
  • Environment Reference
  • API Reference
  • NI TestStand VIs and Functions
  • NI Session Manager
Table of Contents

CodeTemplates.Count

Download PDF
Selected SectionSelected Section and Subsection(s)Entire Manual
  • Updated2026-08-31
  • 1 minute(s) read
    • TestStand
    • API Reference
    • C# .NET

CodeTemplates.Count

Syntax

CodeTemplates.Count

Data Type

Long

Purpose

Returns the number of items in the collection.

Parent topic: Properties

Previous

No previous section

Next

No next section

Previous

No previous section

Next

No next section
  • ©2008 - 2026 ACME Corporation. All Rights Reserved
  • Privacy PolicyTerms of Use
  • Powered By
    Zoomin_Logo
Solutions
  • Academic & Research
  • Aerospace, Defense, & Government
  • Electronics
  • Energy
  • Industrial Machinery
  • Life Sciences
  • Semiconductor
  • Transportation
Orders
  • NI Distribution Partners
  • Order Status and History
  • Retrieve a Quote
  • Terms of Service
  • Order by Part Number or Request a Quote
Company
  • NI is now part of Emerson
  • About
  • Emerson Careers
  • Newsroom
  • Supply Chain & Quality
  • Events
Support
  • Downloads
  • Product Documentation
  • Discussion Forums
  • Activate a Product
  • Submit a Service Request
  • Site Feedback
FacebookTwitterLinkedInYouTubeInstagram
LEGAL | IMPRINT | PRIVACY | Cookie Settings
© NATIONAL INSTRUMENTS CORP. ALL RIGHTS RESERVED.