How to Send Files via HTTP POST in C#?

Uploading Files with HTTP POST in C#

Many web applications need users to upload files. In C#, this is easily accomplished using HTTP POST requests. The HttpWebRequest class provides the tools to create and send these requests, including file uploads. Here's a step-by-step guide:

1. Establish a Connection: Use WebRequest.Create(uri) to create an HttpWebRequest object, specifying the server's URI.

2. Configure the Request: Set essential properties of the HttpWebRequest object:

   • Method: Set to "POST".
   • Credentials: Provide authentication details if needed.
   • ContentType: Specify the file type (e.g., "image/jpeg").
   • ContentLength: Indicate the file's size.

3. Prepare the Upload Data: Create an appropriate HttpContent object. For multipart/form-data uploads (common for file uploads), use MultipartFormDataContent. This allows you to include other parameters alongside the file.

4. Send the Request: Employ the PostAsync method to transmit the request, passing your prepared HttpContent (or equivalent) as the data to upload.

5. Process the Response: Check the response status code (e.g., HttpStatusCode.OK). If successful, access the uploaded data via the response.Content property.

This method ensures efficient and reliable file uploads in your C# applications using HTTP POST.

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