> For the complete documentation index, see [llms.txt](https://dailyjournal.gitbook.io/notes/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dailyjournal.gitbook.io/notes/web-frameworks/asp.net-core/fundamentals/session-and-state-management.md).
# Session & State Management
HTTP is a stateless protocol. By default, HTTP requests are independent messages that don't retain user values. In ASP.NET Core, state can be stored using several approaches.
## `TempData`
This property stores data until it's read in another request. The `Keep(String)` and `Peek(string)` methods can be used to examine the data without deletion at the end of the request. `TempData` is:
* Useful for redirection when data is required for more than a single request.
* Implemented by `TempData` providers using either cookies or session state.
{% tabs %}
{% tab title="First Tab" %}
```csharp
public class CreateModel : PageModel
{
private readonly RazorPagesContactsContext _context;
public CreateModel(RazorPagesContactsContext context)
{
_context = context;
}
public IActionResult OnGet()
{
return Page();
}
[TempData]
public string Message { get; set; }
[BindProperty]
public Customer Customer { get; set; }
public async Task OnPostAsync()
{
if (!ModelState.IsValid)
{
return Page();
}
_context.Customer.Add(Customer);
await _context.SaveChangesAsync();
Message = $"Customer {Customer.Name} added";
return RedirectToPage("./IndexPeek");
}
}
```
{% endtab %}
{% tab title="Second Tab" %}
@page
@model IndexModel
<h1>Peek Contacts</h1>
@{
if (TempData.Peek("Message") != null)
{
<h3>Message: @TempData.Peek("Message")</h3>
}
}
@page
@model IndexModel
<h1>Contacts Keep</h1>
@{
if (TempData["Message"] != null)
{
<h3>Message: @TempData["Message"]</h3>
}
TempData.Keep("Message");
}
{% endtab %}
{% endtabs %}