> For the complete documentation index, see [llms.txt](https://help.clickatell.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.clickatell.com/developers-api-reference/developers-archive/sdks/c.md).

# C\#

**Overview**

Use Clickatell’s C# script library with our HTTP or REST messaging APIs to interact with the Clickatell SMS Gateway. The C# script below allows you to send one- or two-way SMS messages using Clickatell’s SMS Platform.

[View on Github](https://github.com/clickatell/Clickatell-Csharp)

\
**Requirements**

* This script is built with .NETFramework 4.5.2
* Newtonsoft.JSON 9.0.1

 

**Installation**

* Add Rest.cs and API.cs into your project from the Scripts folder
* Add the Newtonsoft.JSON package to your project or the newtonsoft.json.dll file to your project

\
**Using the class**

You call the class by using:

| `private` `string` `response;private` `string` `api;Dictionary<string, string> Params = new` `Dictionary<string, string>();response = Api.SendSMS(api, Params);` |
| ---------------------------------------------------------------------------------------------------------------------------------------------------------------- |

Where:

* *api* is your API key given to you on the platform
* *Params* is a dictionary of the parameters to send with the SMS

\
**Required parameters**

* *to:* the telephone number you are sending the SMS to including the country code (must start with ‘+’)
* *content:* the SMS message that must be sent

A full list of parameters can be found [here](https://docs.clickatell.com/channels/sms-rest-api-platform-archived/sms-rest-api-request-parameters/).

You can add the parameters to the dictionary by using the following code:

| `Params.Add("content", "this is a message");Params.Add("to", "+27745555555");` |
| ------------------------------------------------------------------------------ |

```
 
```

To add more than one number to send the message to multiple recipients, comma delimit the numbers:

| `Params.Add("to", "+27745555555,+27748888888,+27835555555");` |
| ------------------------------------------------------------- |

```
 
```

Once the SMS is sent, it will return a response in the form of a JSON array. The JSON array will include an array of messages that each in turn contains:

* An API Message ID
* Whether the message was accepted or not (true/false)
* The number it was sent to
* An error message if applicable (see link below to error messages)

\
**Read more:**

* Found a bug or missing a feature? Log it [here ](https://github.com/ninjakitteh69/Clickatell-Csharp/issues)and we will take a look.
* Register a new account to send SMSs
* Log in to the platform for API Id, etc.
* [Request parameters](https://docs.clickatell.com/channels/sms-rest-api-platform-archived/sms-rest-api-request-parameters/)&#x20;
* [Send message ](https://docs.clickatell.com/channels/sms-rest-api-platform-archived/sms-rest-api-send-message-2/)info&#x20;
* [Error messages](https://docs.clickatell.com/channels/sms-rest-api-platform-archived/rest-api-error-message-descriptions/)


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