Why ModelState IsValid always return false in mvc

Question

In my controller this code    HttpPost          public ActionResult Edit Company company  FormCollection IsCostCenters                        if  ModelState IsValid                                Company objNewCompany   new Company                      oParty CostCenters Clear                     using  PaymentAdviceEntityContainer db1   new PaymentAdviceEntityContainer                                          objNewCompany   db1 Companies Find company Id                        objNewCompany CostCenters Clear                         string   temp   IsCostCenters  CostCenters   Split new char            StringSplitOptions RemoveEmptyEntries                       foreach  var s in temp                                                if  s     false                                                          CostCenter oCostCenter   new CostCenter                                oCostCenter   db1 CostCenters Find Convert ToInt32 s                                objNewCompany CostCenters Add oCostCenter                                                                       db1 SaveChanges                                       db Entry company  State   EntityState Modified                  db SaveChanges                    return RedirectToAction  Index                              ViewBag CreatedById   new SelectList db Employees   Id    FirstName   company CreatedById               return View company               And my view  code as below   using PaymentAdviceEntity          ViewBag Title    Edit       List lt CostCenter gt  clist   new List lt CostCenter gt         clist     List lt CostCenter gt  ViewBag CostCenters  ToList                                 lt div style  line-height  22px  width  100  height  3   float  left    gt                                foreach  var item in clist                                                            lt div  style  line-height  22px  width  28   float  left   gt                                                   lt span class  checkbox  gt  Html CheckBox  CostCenters   item IsChecked  new    value   item Id    lt  span gt                                                  lt span gt  Html DisplayFor modelItem   gt  item Name  lt  span gt                                  lt  div gt              So please what is reason ModelState IsValid is return false in page post time

User · Accepted Answer

Please post your Model Class   To check the errors in your ModelState use the following code   var errors   ModelState      Where x   gt  x Value Errors Count  gt  0       Select x   gt  new   x Key  x Value Errors         ToArray      OR  You can also use  var errors   ModelState Values SelectMany v   gt  v Errors     Place a break point at the above line and see what are the errors in your ModelState

User · Answer

As Brad Wilson states in his answer here      ModelState IsValid tells you if any model errors have been added to   ModelState       The default model binder will add some errors for basic type   conversion issues  for example  passing a non-number for something   which is an  int    You can populate ModelState more fully based on   whatever validation system you re using    Try using  -   if   ModelState IsValid        var errors   ModelState SelectMany x   gt  x Value Errors Select z   gt  z Exception            Breakpoint  Log or examine the list with Exceptions      If it helps catching you the error  Courtesy this and this

User · Answer

ModelState IsValid  tells you that the model is consumed by the view  i e  PaymentAdviceEntity  is satisfy all types of validation or not specified in the model properties by DataAnotation   In this code the view does not bind any model properties  So if you put any DataAnotations or validation in model  i e  PaymentAdviceEntity   then the validations are not satisfy  say if any properties in model is Name which makes required in model Then the value of the property remains blank after post So the model is not valid  i e  ModelState IsValid returns false   You need to remove the model level validations

[c#] Why ModelState.IsValid always return false in mvc

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