Getting error when am inserting drop down list value in db

Question

am binding data  to drop down from database, then i want to insert those selected value in another table but am getting error   as   An exception of type 'System.NullReferenceException' occurred in App_Web_2himjopn.dll but was not handled in user code Additional information: Object reference not set to an instance of an object.    @Html.DropDownListFor(u => u.AccountListModel, Model.AccountListModel, new { @style = "width:150px;height:22px;", @id = "ddlAccount" }) getting error here      but values are saving in database table

Saineshwar Bageri · Answer

Once you post form re-fill dropdownlist Value and set values which is posted in model. public ActionResult Index(Transaction_GeneralInfo transactionGInfo, Accounting_PendingBills accountPendings, string Command, FormCollection form, int? VnumberSearch) { transaction.SelectedItem= assign model value here ; transaction.AccountListModel= Bind list here; }

suman goud · Answer

please find zip for error screenshot my controller code public ActionResult Index(Transaction_GeneralInfo transactionGInfo, Accounting_PendingBills accountPendings, string Command, FormCollection form, int? VnumberSearch) { try { if (ModelState.IsValid && Command == "Save") { string strddlAccount = form["SelectedItem"].ToString(); string strddlCustomer = form["ddlCustomer"].ToString(); TempData["ddlcustomer"] = strddlCustomer; string ddlcu = (string)TempData["ddlcustomer"]; using (TestDemoEntities db = new TestDemoEntities()) { var transaction = db.Transaction_GeneralInfo.Create(); transaction.AccountId = strddlAccount; transaction.Remarks = transactionGInfo.Remarks; db.Transaction_GeneralInfo.Add(transaction); db.SaveChanges(); } view @model AccountsPageLayout.Models.ReceiptsViewModel @Html.DropDownListFor(u => u.SelectedItem, Model.AccountListModel, new { @style = "width:150px;height:22px;", @id = "ddlAccount" }) @*@Html.DropDownList("AccountListModel", Model.AccountListModel, new { @style = "width:150px;height:22px;" })*@

Saineshwar Bageri · Answer

Hi Suman, 1) Post your error screenshot 2) and Event where it is occuring

suman goud · Answer

hi sir, thank you responding i have tried that also sir, getting same error @Html.DropDownListFor(u => u.SelectedItem, Model.AccountListModel, new { @style = "width:150px;height:22px;", @id = "ddlAccount" })

Saineshwar Bageri · Answer

There must not be same model Properties for selecting value and binding collection. @Html.DropDownListFor(u => u.AccountListModel, Model.AccountListModel, new { @style = "width:150px;height:22px;", @id = "ddlAccount" })   Add new Property to Model.   public string SelectedAccount { get; set; }
@Html.DropDownListFor(u => u.SelectedAccount, Model.AccountListModel, new { @style = "width:150px;height:22px;", @id = "ddlAccount" })