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ASP.NET Core MVC – ViewData

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ViewData

Type: ViewDataDictionary (key-value pair, loosely typed)

Scope: From Controller to View

✅ Use Case:

Passing small amounts of temporary data from controller to view.

✅ Example:

Controller:






public IActionResult Index() { ViewData["Message"] = "Hello from ViewData"; return View(); } 








View (Razor):







html



<h2>@ViewData["Message"]</h2> 







⚠️ Considerations:


    
    
  • 
    
    
    Requires type casting
    
    
    • 
    
  • 
    
    
    Null reference risk
    
    
    • 
    
  • 
    
    
    Not strongly typed
    
    
    • 







                        

                               
                                                            
                        


                    



                

            

        

    






        
        
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