MemoryStream to PDF C#
Published: 2022-01-19 08:38:22

---
canonical_url: https://ironpdf.com/docs/questions/pdf-memory-stream/
---

We can load, create, and export MemoryStream to PDF files in C# .NET without even touching the file system. This is possible through the MemoryStream object present inside the System.IO .NET namespace. Follow the tutorial below to find out how to export HTML to PDF in your C# project.

---

**Step 1**

# Install IronPDF

In this tutorial, we'll be using IronPDF's C# PDF Library to save MemoryStream files to PDF in C#. You can [download it free](https://ironpdf.com/packages/IronPdf.Package.For.CSharp.Memorystream.PDF.zip) or [install to Visual Studio with NuGet](https://www.nuget.org/packages/IronPdf).

`PM > Install-Package IronPdf`

---

**How to Tutorial**

# 2. Load a PDF from Memory

A new instance of `IronPdf.PdfDocument` can be initialized in any of these .NET in-memory-objects:

- A MemoryStream
- A FileSteam
- Binary Data as a Byte array (byte[])

Here is an example of reading a URL directly into a stream, then saving the PDF file to disk by using C#:

**C#:**
```
​    private void ReadViaMemStream()
​    {
​      //Conversion of the URL into PDF
​      var Renderer = new IronPdf.ChromePdfRenderer();
​      Uri url = new Uri("https://ironpdf.com/docs/questions/pdf-memory-stream/");
​      MemoryStream rend = Renderer.RenderUrlAsPdf(url).Stream; //Read stream
​      HttpContext.Current.Response.AddHeader("Content-Type", "application/pdf"); //Download
​      HttpContext.Current.Response.AddHeader("Content-Disposition", String.Format("{0}; filename=Print.pdf; size={1}", "attachment", rend.Length.ToString()));
​      // Write PDF buffer to HTTP response
​      HttpContext.Current.Response.BinaryWrite(rend.ToArray());
​      // Stop page processing
​      HttpContext.Current.Response.End();
​    }
```

**VB:**
```
​ Private Sub ReadViaMemStream()
​ ​ var Renderer = New IronPdf.ChromePdfRenderer()
​ Uri url = New Uri("https://ironpdf.com/docs/questions/pdf-memory-stream/")
​ MemoryStream rend = Renderer.RenderUrlAsPdf(url).Stream 'Read stream
​ HttpContext.Current.Response.AddHeader("Content-Type", "application/pdf") 'Download
​ HttpContext.Current.Response.AddHeader("Content-Disposition", String.Format("{0}; filename=Print.pdf; size={1}", "attachment", rend.Length.ToString()))
​ ​ HttpContext.Current.Response.BinaryWrite(rend.ToArray())
​ ​ HttpContext.Current.Response.End()
'INSTANT VB TODO TASK: The following line uses invalid syntax:
'​ }
```

---

# 3. Save a PDF to Memory

An IronPdf.PdfDocument can be saved directly to memory in one of 2 ways:

- [IronPdf.PdfDocument.Stream](https://ironpdf.com/object-reference/api/IronPdf.PdfDocument.html) exports the PDF as a System.IO.MemoryStream
- [IronPdf.PdfDocument.BinaryData](https://ironpdf.com/object-reference/api/IronPdf.PdfDocument.html) exports the PDF as a Byte Array (byte[])

Here is a quick example for MVC and ASP.NET:

## 4.1 Export a PDF with MVC

**C#:**
```

return new FileStreamResult(stream, “application/pdf”)
{
   FileDownloadName = “downloadedfile.pdf”
};
```

**VB:**
```
'INSTANT VB TODO TASK: The following line uses invalid syntax:
'Return New FileStreamResult(stream, "application/pdf”) { FileDownloadName = "downloadedfile.pdf” };
```

## 4.1 Export a PDF with ASP.NET

**C#:**
```
byte[] Binary = MyPDFDocument.BinaryData;
Response.Clear();
Response.ContentType = “application/octet-stream”;
Context.Response.OutputStream.Write(Binary, 0, Binary.Length);
Response.Flush();
```

**VB:**
```
Dim Binary() As Byte = MyPDFDocument.BinaryData
Response.Clear()
'INSTANT VB TODO TASK: The following line uses invalid syntax:
'Response.ContentType = "application/octet-stream”; Context.Response.OutputStream.Write(Binary, 0, Binary.Length); Response.Flush();
```