# Bulk User Import - The format of value multipart/form-data is invalid

**URL:** <https://community.auth0.com/t/bulk-user-import-the-format-of-value-multipart-form-data-is-invalid/110607>\
**Category:** Get Help\
**Tags:** user-import-export, user-management\
**Created:** [July 5, 2023, 2:02pm UTC](https://community.auth0.com/t/bulk-user-import-the-format-of-value-multipart-form-data-is-invalid/110607 "2023-07-05T14:02:29Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![carl.t](https://upload.wikimedia.org/wikipedia/commons/thumb/7/7c/User_font_awesome.svg/768px-User_font_awesome.svg.png) [@carl.t](https://community.auth0.com/u/carl.t)\
**Post date:** [July 5, 2023, 2:02pm UTC](https://community.auth0.com/t/bulk-user-import-the-format-of-value-multipart-form-data-is-invalid/110607/1 "2023-07-05T14:02:29Z")

</div>

Getting the below error when following this guide: [Bulk User Imports](https://auth0.com/docs/manage-users/user-migration/bulk-user-imports)

System.FormatException: ‘The format of value ‘multipart/form-data; boundary=—011000010111000001101001’ is invalid.’

I have my code setup as shown in the C# example:

```auto
request.AddHeader("authorization", "Bearer " + apiToken);
request.AddHeader("content-type", "multipart/form-data; boundary=---011000010111000001101001");
request.AddParameter("multipart/form-data; boundary=---011000010111000001101001", "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"users\"; filename=\"output_0.json\"\r\nContent-Type: text/json\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"connection_id\"\r\n\r\nXXXXXXXXXXX\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"external_id\"\r\n\r\n123456\r\n-----011000010111000001101001--\r\n", ParameterType.RequestBody);

RestResponse response = client.Execute(request);

```

Any ideas how to rectify this issue?

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<div class="post-metadata">

**Author:** ![dan.woda](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/dan.woda/32/18340_2.png) [@dan.woda](https://community.auth0.com/u/dan.woda)\
**Post date:** [July 7, 2023, 1:49pm UTC](https://community.auth0.com/t/bulk-user-import-the-format-of-value-multipart-form-data-is-invalid/110607/3 "2023-07-07T13:49:11Z")

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Hi @carl.t,

Can you try the web GUI instead?

> **[Auth0 Management API v2](https://auth0.com/docs/api/management/v2#!/Jobs/post_users_imports)**

Or use the extension?

> **[User Import / Export Extension](https://auth0.com/docs/customize/extensions/user-import-export-extension)**
>
> Learn about the User Import/Export extension, which allows you to import and export users from or to any database you have configured in your account.

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<div class="post-metadata">

**Author:** ![carl.t](https://upload.wikimedia.org/wikipedia/commons/thumb/7/7c/User_font_awesome.svg/768px-User_font_awesome.svg.png) [@carl.t](https://community.auth0.com/u/carl.t)\
**Post date:** [July 13, 2023, 11:24am UTC](https://community.auth0.com/t/bulk-user-import-the-format-of-value-multipart-form-data-is-invalid/110607/4 "2023-07-13T11:24:30Z")

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Hi @dan.woda,

The C# code examples are not valid though.

Ended up with something like this:

```auto
var uploadRequest = new RestRequest("", Method.Post);
            uploadRequest.AddHeader("Content-Type", "multipart/form-data");
            uploadRequest.AddHeader("Accept", "application/json");
            uploadRequest.AddHeader("Authorization", "Bearer " + ApiToken);
            uploadRequest.AddFile("users", path);
            uploadRequest.AddParameter("connection_id", Auth0DbConnectionId);
            uploadRequest.AddParameter("upsert", "false");
            uploadRequest.AddParameter("send_completion_email", "false");

            var uploadResponse = client.Execute(uploadRequest);

```

Which follows the endpoint code more than the code from the docs.

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<div class="post-metadata">

**Author:** ![dan.woda](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/dan.woda/32/18340_2.png) [@dan.woda](https://community.auth0.com/u/dan.woda)\
**Post date:** [July 14, 2023, 12:41pm UTC](https://community.auth0.com/t/bulk-user-import-the-format-of-value-multipart-form-data-is-invalid/110607/5 "2023-07-14T12:41:51Z")

</div>

To confirm, that is working correctly for you?

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<div class="post-metadata">

**Author:** ![system](https://global.discourse-cdn.com/auth0/original/3X/b/5/b560f266932fcce5d57f09a6595bd50518cae3f3.jpeg) [@system](https://community.auth0.com/u/system)\
**Post date:** [July 28, 2023, 12:42pm UTC](https://community.auth0.com/t/bulk-user-import-the-format-of-value-multipart-form-data-is-invalid/110607/6 "2023-07-28T12:42:12Z")

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