c# - How to make an Edit operation properly in ASP.NET MVC4? -


I am trying to make an update like this: 

  [http post ] [ValidateNetworking Tokens] Public Action Result Modifier (OSMODEL OS) {if (ModelState.IsValid) {_db.Entry (OS) .set = EntityState.Modified; // Success ! String str = "o"; Redirect return action ("index", new {str = str}); } // failed! See Return (OS); }   
 After updating an OS line using this, the row is not updated. What is wrong in this matter?  
 OSModel <{p> 
  [table ("OS")] Public class OSMDell {{Key] Public IT IDO (Receive); Set; } [Required] public string nameOS {get; Set; } [Required] public string versionOS {get; Set; } [Required] public string versionOS {get; Set; } [Required] public string servicepackOS {get; Set; } [Required] public int bitsOS {get; Set; } Public OSMDell () {}}   
 In debug mode, I get the full data of the separate input OS of the ID that is set to 0.   
 
 
 The thing is that you  _db.SaveChanges ()  after  _dn.Entry (OS) ..data = ... , try to save the changes to the database:  
  [http post] [legitimate antigoukri token] public actioners Modifier (OSMODELE OS) {if (ModelState.IsValid) {_db.Entry (OS) .set = EntityState.Modified; _db.SaveChanges (); // You must add this line // success! String str = "o"; Redirect return action ("index", new {str = str}); } // failed! See Return (OS); }

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