object refrence is required for the non static field

Question

public ActionResult SignUp( UserBO objUserBO ) { if (ModelState.IsValid) { UserBL objUserBL = new UserBL(); if(objUserBO.UserId >= 1) { nsrouteEntities.Entry( objUserBL).State = EntityState.Modified; } else { CustomBO objCustomBO = objUserBL.AddUser(objUserBO); return View("Login"); } } return View(objUserBO); } for the bold part the below error is coming object reference is required for the non static field,method or property the form is opening properly but when we submit the form it is adding a new record instead of upadating the existing record

Sachin Singh · Answer

the error is coming because you have not instantiated your Context (nsrouteEntities) so please do like below public ActionResult SignUp( UserBO objUserBO ) { nsrouteEntities db= new nsrouteEntities(); if (ModelState.IsValid) { UserBL objUserBL = new UserBL(); if (objUserBO.UserId >= 1) { db.Entry(objUserBL).State = EntityState.Modified; } else { CustomBO objCustomBO = objUserBL.AddUser(objUserBO); return View( "Login" ); } } return View(objUserBO); } FYI:- any class which is not marked as static needs to be instantiated to call their methods , the DbContext class has a method Entry() which you are trying to call without creating the object of your context class so you are getting the error.

Mageshwaran R · Answer

Hi Patel, please refer this link: https://stackoverflow.com/questions/498400/cs0120-an-object-reference-is-required-for-the-nonstatic-field-method-or-prop

Nisha Regil · Answer

Within UserBL objUserBL = new UserBL(); Please specify which row you want to modify so as to identify the row uniquely. Please refer to below links. https://docs.microsoft.com/en-us/ef/ef6/saving/change-tracking/entity-state https://entityframeworkcore.com/knowledge-base/54274166/how-does-ef-core-modified-entity-state-behave-