# AttachmentContent
> Tracon documentation. Tracon is a .NET package family that adds a control
> plane on Microsoft Agent Framework, published as NuGet packages that run
> inside your own ASP.NET Core application.
>
> Page: https://tracon.dev/api/tracon.attachmentcontent/
> Summary: AttachmentContent: The content of a new attachment to be saved into the store.
Namespace Tracon · Assembly Tracon.Abstractions.dll
The content of a new attachment to be saved into the store.
```csharp
public sealed class AttachmentContent
```
- Inheritance
- object ← AttachmentContent
- Inherited Members
- object.GetType(), object.ToString(), object.Equals(object?), object.Equals(object?, object?), object.ReferenceEquals(object?, object?), object.GetHashCode()
## Remarks
The content is carried already read into memory, because it stays under the size
limit (20 MB by default); the store layer does not deal with streaming. The type
itself is not a `record`: the [AttachmentContent.Data](/api/tracon.attachmentcontent/#Tracon_AttachmentContent_Data) field can be large, and the
generated `ToString` and equality comparison must not copy the whole content
by accident.
## Constructors
### AttachmentContent\(\)
```csharp
public AttachmentContent()
```
## Properties
### CreatedBy
Gets the actor that uploaded it, or [null](https://learn.microsoft.com/dotnet/csharp/language-reference/keywords/null) when it is unknown.
```csharp
public string? CreatedBy { get; init; }
```
#### Property Value
[string](https://learn.microsoft.com/dotnet/api/system.string)?
### Data
Gets the raw content.
```csharp
public required ReadOnlyMemory Data { get; init; }
```
#### Property Value
[ReadOnlyMemory](https://learn.microsoft.com/dotnet/api/system.readonlymemory\-1)<[byte](https://learn.microsoft.com/dotnet/api/system.byte)\>
### FileName
Gets the original file name.
```csharp
public required string FileName { get; init; }
```
#### Property Value
[string](https://learn.microsoft.com/dotnet/api/system.string)
### MediaType
Gets the validated MIME type.
```csharp
public required string MediaType { get; init; }
```
#### Property Value
[string](https://learn.microsoft.com/dotnet/api/system.string)
### RunId
Gets the run that produced the attachment. [null](https://learn.microsoft.com/dotnet/csharp/language-reference/keywords/null) for a user upload.
```csharp
public Guid? RunId { get; init; }
```
#### Property Value
[Guid](https://learn.microsoft.com/dotnet/api/system.guid)?
### SessionId
Gets the session the attachment is bound to. [null](https://learn.microsoft.com/dotnet/csharp/language-reference/keywords/null) for an upload without a session.
```csharp
public string? SessionId { get; init; }
```
#### Property Value
[string](https://learn.microsoft.com/dotnet/api/system.string)?
### TenantId
Gets the tenant the attachment will belong to.
```csharp
public required string TenantId { get; init; }
```
#### Property Value
[string](https://learn.microsoft.com/dotnet/api/system.string)