Add conditional fields to a document for signature with C# SDK using the API

Use airSlate SignNow's API to provide your customers with smart and flexible eSignature workflows. Add fields that appear only after certain conditions are met in a document.

  • Free to test
  • Fast to deploy
  • Powerful & secure

Generate documents with conditional fields

Use this sample code to insert conditional fields into your document to ensure fast and accurate document completion.

Copy code
  • We provide developers with complete SDKs for all popular languages, allowing them to integrate eSignature workflows without writing a single line of code.
  • With our detailed documentation, integrating the airSlate SignNow API is a breeze.
  • The airSlate SignNow API not only provides you with eSignatures: use it to create fillable forms, request payments, and download & archive documents using simple API calls.

airSlate SignNow regularly wins awards for ease of use and setup

Read our reviews on the trusted resources

Tech Data uses airSlate SignNow to improve our internal and external customer service while increasing our speed to revenue.
Bob Dutkowsky CEO
Bob Dutkowsky | CEO

Select an API package for your business

Integrate eSignatures into your software and get 250 legally-binding signature invites with your API free trial.

Check API pricing

Solution engineers

We are here to help you configure eSignature API to your workflow.

Review airSlate SignNow’s API documentation

The detailed API tutorial will guide you through the entire integration process and provide clear coding examples.

Video guides

Watch our video guides for instructions on how to easily build custom integrations.

Start with any of our SDKs

Get complete SDKs for Node.js, Python,
PHP, Java, C#.

Enterprise-grade security and compliance

airSlate SignNow is committed to protecting your sensitive information by complying with global industry-specific security standards.

GDPR compliance
GDPR compliance
Regulates the use and holding of personal data belonging to EU residents.
SOC 2 Type II Certified
SOC 2 Type II Certified
Guarantees the security of your data & the privacy of your clients.
PCI DSS certification
PCI DSS certification
Safeguards credit/debit card data for every monetary transaction a customer makes.
21 CFR Part 11
21 CFR Part 11
FDA-backed standards for electronic documentation and electronic signatures.
HIPAA compliance
HIPAA compliance
Protects the private health information of your patients.
CCPA compliance
CCPA compliance
Enhances the protection of personal data and the privacy of California residents.

Watch the airSlate SignNow API in action

Get started with uninterrupted eSignature API: add conditional fields to a document for signature with C# SDK using the API

Consolidate and streamline your eSignature workflows and establish seamless processes. Try the airSlate SignNow API, implement eSignature workflows into your custom apps and websites in minutes, and seamlessly add conditional fields to a document for signature with C# SDK using the API.

Add conditional fields to a document for signature with C# SDK using the API the airSlate SignNow API for uninterrupted eSignature API

  1. Click API on the airSlate SignNow main page and create your API Sandbox account.
  2. Open your email to confirm the registration and specify a password for accessing your Developer Sandbox environment.
  3. Find the list of your apps at the top of the page. By default, you can also find a Test App for testing the API.
  4. Click its name to access the Client ID and Basic Authorization Token.
  5. Launch the API using the information from the previous step.
  6. Use the code samples from the airSlate SignNow library.
  7. When you're ready to go live, go to your airSlate SignNow account and choose a subscription plan.
  8. If you can't find a subscription that suits your needs, contact the Sales team.
  9. Change the test URL in your requests to the production environment URL.
  10. Delight your customers and partners with a streamlined eSignature experience.

The airSlate SignNow API is straightforward to embed, test, and work with (no sales people engaged). Gain the opportunity to add conditional fields to a document for signature with C# SDK using the API easily. Select airSlate SignNow for more optimized eSignature workflows.

How it works

Create an account and get the required tokens
Use code samples to add conditional fields to a document for signature with C# SDK using the API
Enjoy the power of eSignature in your workflows

Watch our instructions to build custom integrations with ease

airSlate SignNow offers a free testing environment to explore the eSignature.

Trusted eSignature solution — what our customers are saying

Explore how the airSlate SignNow eSignature platform helps businesses succeed. Hear from real users and what they like most about electronic signing.

Made Hiring so Much Easier
5
Anna S

What do you like best?

Made our onboarding so much easier. New hires are able to send information and get in faster! It is so much easier to be able to send this to a new hire. Now we are able to send this to them and we can see who is coming in before and prepare for our day. Spend your time on training instead of filling W2 all day. Also cleared up so much room in our filing cabinets.

Read full review
I love the ease & convenience of airSlate SignNow
5
Bruce E

What do you like best?

I love the ease & convenience of airSlate SignNow. It is user-friendly — and just as easy to use on my phone as it is on my desktop!

Read full review
airSlate SignNow is so helpful for any type of biz
5
Agency

What do you like best?

It’s so easy to use! We upload our agreements, contracts, accounting paperwork, waivers, etc. then add a few quick fill in or signature spots and send it off to clients or vendors for signature. Easy peasy. And we love that we always have a record of signed docs showing when they were signed for our records. And the reminder send is great for forgetful or busy signers.

Read full review

Ready to get started?

FAQs

Below is a list of the most common airSlate SignNow API questions and answers. Just choose a question to view a detailed answer.

Need help? Contact support

Ready to get started?

It’s time to watch the airSlate SignNow API in action. Create your developer account and upload documents, request signatures, and check the status of your document.

Why choose the airSlate SignNow API?:

  • Free to test and easy to deploy
  • SDKs for popular languages
  • Customizable for any workflow
  • Industry-leading security & compliance