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 })