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ASP.NET Core MVC – TempData Data Passing Techniques

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3. TempData

Type: TempDataDictionary

Scope: Across requests (redirects)

✅ Use Case:

Used to pass data between actions (e.g., after a redirect), useful for messages like "Saved Successfully".

✅ Example:

Controller (Action 1):






csharp



public IActionResult Save() { TempData["SuccessMessage"] = "Data saved successfully!"; return RedirectToAction("Index"); } 








Controller (Action 2 or View):







csharp



public IActionResult Index() { var message = TempData["SuccessMessage"]; return View(); } 








View (Razor):







html



@if (TempData["SuccessMessage"] != null) { <div class="alert alert-success">@TempData["SuccessMessage"]</div> } 







⚠️ Considerations:


    
    
  • 
    
    
    Lives for a single request (unless Keep() or Peek() is used)
    
    
    • 
    
  • 
    
    
    Backed by cookies or session
    
    
    • 







                        

                               
                                                            
                        


                    



                

            

        

    






        
        
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