ADO.NET :: Null Value Cannot Be Assigned To A Member With Type System?

Dec 22, 2010

I am getting an exception on a linq to sql query:The null value cannot be assigned to a member with type System.DateTime which is a non-nullable value type.


View 3 Replies

Similar Messages:

DataSource Controls :: The Null Value Cannot Be Assigned To A Member With Type System.Decimal Which Is A Non-nullable Value Type

Dec 22, 2010

I am making a website to store invoices so i can mail them to clients. So i got a table for clients, invoices and one with invoice products/services. When an invoice has no products/services added to them and it returns null i get the error "the null value cannot be assigned to a member with type System.Decimal which is a non-nullable value type."

I just started with linq. Before i always used mysql. Mostly i just had to call data from 1 table so forgive me if my linq query isn't really correct.

Dim invoices = From i In db.invoices _
Group Join p In db.products On Equals p.invoiceId Into invoiceProducts = Group _
Select New With {i.client.naam, i.titel, (From iP In invoiceProducts Select iP.prijs).Sum}

i show the client's name, the title of the invoice and the total amount the clients will need to pay for products and services.

View 1 Replies

MVC :: The Null Value Cannot Be Assigned To A Member With Type System.Int32 Error

Dec 26, 2010

I got the following error when i tried to insert a new record after the run my project, so what does this error indicates?

"{"Cannot insert explicit value for identity column in table 'Articles' when IDENTITY_INSERT is set to OFF."} System.Exception {System.Data.SqlClient.SqlException}


View 4 Replies

MVC :: The Null Value Cannot Be Assigned To A Member With Type System.Int32 Which Is A Non-nullable Value?

Dec 26, 2010

When i click on the page that represents a controller the following error was displayed:-

"The null value cannot be assigned to a member with type System.Int32 which is a non-nullable value type"

On this link of code

var articleapproval = articletyperepository.FindAllArticlesRequireMyApproval().ToList();
while the FindAllArticlesRequireMyApproval execute the following LINQ statement :-
var articleapproval= articletyperepository.FindAllArticlesRequireMyApproval().ToList();

where this methods calls the following LINQ statement:-

View 2 Replies

ADO.NET :: The Null Value Cannot Be Assigned To A Member With Type System.Int32 Which Is A Non-nullable Valu...

Nov 17, 2010

My code:


If the value is null writes out that error.How to check if the value is null? And if the value is null, I want to store + 1

View 1 Replies

MVC :: Model With List As Member: Member Always Null After Submit?

Nov 25, 2010

I have following model class:

public class WebModel
public List<ArticleModel> Articles { get; set; }
public class ArticleModel
public int ID { get; set; }
public double ValueParam { get; set; }

Then I have the controller with the two actions:

public ActionResult Index()
WebModel model = new WebModel();
ModelConverter.ConvertToModel(model, controller);
return View(model);
public ActionResult Index(WebModel model, string saveButton)
ModelValidation.ValidateWebModel(model, ModelState);
if (ModelState.IsValid)
return RedirectToAction("Create", "Article");
ModelConverter.ConvertToModel(model, controller);
return View(model);

And this is my view:

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<Web.Models.WebModel>" %>
<asp:Content ID="Content1" ContentPlaceHolderID="MainContent" runat="server">
<%var controller = Session["controller"] as Web.Code.SessionController; %>
<%Html.BeginForm(); %>
<table width="100%">
<%foreach (var article in Model.Articles)
<tr style="text-align: right">
<%:Html.DropDownListFor(m=>m.Articles.FirstOrDefault(f=>f.ID == article.ID).ID, new SelectList(controller.CurrentProdukt.Articles.AsEnumerable(), "ID", "Name", article.ID)) %>
<%:Html.TextBoxFor(m => m.Articles.FirstOrDefault(f => f.ID == article.ID).ValueParam)%>
<%} %>
<table style="width: 100%">
<input type="submit" name="saveButton" value="Save" />
<%Html.EndForm(); %>

If I press the submit button, I get to the second action method in the controller (the one with the HttpPost attribute). In this action, the object model itself is not null, but the "Articles" list inside is null.

View 2 Replies

Databases :: Catching NULL Values Error "Cannot Cast DBNull.Value To Type 'System.Double'. Please Use A Nullable Type"

Apr 21, 2010

I am LINQ querrying against a datatable. However, I am unsuccessfull with catching null values. Here is my code that is giving me the following error.


I am checking to see if minperc is null. However to check that it still is trying to convert the value to double. Cant figure out a way around it. Here is the error: Cannot cast DBNull.Value to type 'System.Double'. Please use a nullable type.

View 1 Replies

Forms Data Controls :: Unable To Cast Object Of Type 'System.Web.UI.LiteralControl' To Type 'System.Web.UI.WebControls.TextBox'

Jan 5, 2010

Unable to cast object of type 'System.Web.UI.LiteralControl' to type 'System.Web.UI.WebControls.TextBox'.


View 3 Replies

DataSource Controls :: Unable To Cast Object Of Type '<TakeIterator>d__3a`1[System.Char]' To Type 'System.Collections.IList'

Jan 2, 2010

I want to do paging the API Membership without using the datacontrols, but I get this error "Unable to cast object of type '<TakeIterator>d__3a`1[System.Char]' to type 'System.Collections.IList'." when I do this,


View 1 Replies

Forms Data Controls :: Unable To Cast Object Of Type 'System.DBNull' To Type 'System.String'.

Oct 1, 2010

Basically, what I did is that: I have a table in SQL database and some of data fields allow null. I built Objectdatasource through dataset. When I built update page using dataset. It generate the following error before showing the update page correctly. It seems I have issue to retrieve the null value from the database through using objectdatasource through dataset. Any suggestions?An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code

View 6 Replies

Databases :: Retrieving From OdbcDataReader / Unable To Cast Object Of Type 'System.Byte[]' To Type 'System.String'

Feb 16, 2010

I have defined an ODBC Command and ODBCdatareader as follows

OdbcConnection myConnection = new OdbcConnection(connectionString);
OdbcCommand myCommand = new OdbcCommand();
myCommand.Connection = myConnection;
myCommand.CommandText = "select UOPGM from GREG.TUSROPTF";
OdbcDataReader myReader;
myReader = myCommand.ExecuteReader();

When I try to retreive from the reader as follows:

while (myReader.Read())
string someString = myReader["UOPGM"];

I get the following error

Error reading the database. Unable to cast object of type 'System.Byte[]' to type 'System.String'."

I have also tried string someString = (string)myReader["UOPGM"]; to no avail

View 4 Replies

DataSource Controls :: Unable To Cast Object Of Type 'System.DBNull' To Type 'System.String'

May 28, 2010

I am trying to write a table output from SQL database to a gridview/ Data List through an Object Data Source. I am a new starter and your help will be useful.

public List<Staff> GetStaff()
cmd.CommandType =
SqlConnection con =
SqlConnection(connectionstring);SqlCommand cmd =

View 4 Replies

Forms Data Controls :: >>Object Of Type 'System.Boolean' Cannot Be Converted To Type 'System.Byte[]'?

Sep 30, 2010

I am trying to upload a picture into database using FormView insertItemTemplate. FormView is bounded by objectdatasource.To upload, I placed FileUpload control inside insertItemTemplate.In table the dataType is image.Error:Object of type 'System.Boolean' cannot be converted to type 'System.Byte[]'.

View 3 Replies

Fluent Nhibernate System.ApplicationException : For Property 'Id' Expected '1' Of Type 'System.Int32' But Got '2' Of Type 'System.Int32'

Jul 6, 2010

I am writing unit tests for fluent Nhibernate, when I run the test in isloation it passes, but when I run multiple tests. or run the test more than once it starts failing with the message below System.ApplicationException : For property 'Id' expected '1' of type 'System.Int32' but got '2' of type 'System.Int32'

public void Can_Correctly_Map_Entity()
new PersistenceSpecification<UserProfile>(Session)
.CheckProperty(c => c.Id, 1)
.CheckProperty(c => c.UserName, "user")
.CheckProperty(c => c.Address1, "Address1")
.CheckProperty(c => c.Address2, "Address2")

View 2 Replies

Web Forms :: Unable To Cast Object Of Type 'System.DateTime' To Type 'System.String'

Nov 10, 2010


Above is my code. The error I'm get is, Unable to cast object of type 'System.DateTime' to type 'System.String'.

The column "To" and column "Subject" are strings and column "Receive" is DateTime. I can't made any changes in the database, so I need to write some code to handle casting a string to datetime or if statement as a work around.

View 6 Replies

Unable To Cast Object Of Type 'System.EventArgs' To Type 'System.Web.UI.WebControls.FormVi

Nov 24, 2010

Protected Sub FormView1_ItemCreated(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.FormViewCommandEventArgs) Handles FormView1.ItemCreated
Causes Unable to cast object of type 'System.EventArgs' to type 'System.Web.UI.WebControls.FormViewCommandEventArgs'.

The program ( works fine with FormView1_ItemCommand and FormView1_ItemInserted events but strangely objects to FormView1_ItemCreated. Is it only a VC# event?

View 2 Replies

Web Forms :: Unable To Cast Object Of Type System String To Type System Byte

Feb 20, 2013

Unable to cast object of type 'System.String' to type 'System.Byte[]'....

on line #2

private void download(DataTable dt) { Byte[] bytes = (Byte[])dt.Rows[0]["FileData"];

Response.Buffer = true; Response.Charset = "";

View 1 Replies

ADO.NET :: Unable To Cast Object Of Type System.Guid To Type System.String?

Sep 17, 2010

System.InvalidCastException was unhandled by user code
Message=Unable to cast object of type 'System.Guid' to type 'System.String'.

View 4 Replies

MVC :: Unable To Cast Object Of Type 'System.Web.Mvc.ValueProviderResult' To Type 'System.IConvertible'

Aug 23, 2010

Why am I getting this error on line:

sp.Price = Convert.ToDecimal(collection.GetValue("Price"));

sp is :

SPecials_Templates sp = new SPecials_Templates();

SPecials_Templates Defined:

public partial class SPecials_Templates
public class SPecials_TemplatesMetaData
public object Key { get; set; }
public object Template_Name { get; set; }
public object Headline { get; set; }
public object headline2 { get; set; }

View 2 Replies

Web Forms :: Variable Used Before It Is Assigned Value Null Reference Could?

Sep 10, 2010

xamount is receiving this message on the last line. The session is being set in the previous page. Is there a way to resolve the message or should I just use a previous page postback


View 9 Replies

MVC :: Nullable DateTime And DatePicker - Dictionary Requires A Non-null Model Item Of Type 'System.DateTime

Apr 1, 2011

I have a problem:

I've created usual Controller and View(Edit view) for editing my Entity (EntityFramework)

Here is view example:

<div class="editor-field">

@Html.EditorFor(model => model.BirthDate)

@Html.ValidationMessageFor(model => model.BirthDate)


BirthDate is Nullable<DateTime>

but during loading my View I get this exception

The model item passed into the dictionary is null, but this dictionary requires a non-null model item of type 'System.DateTime'.

That's because of BirthDate is null in database but it is nullable and I expect that it just leaves the filed empty.

And I have Shared EditorTemplate:

@model System.Nullable<System.DateTime>

@if (Model.HasValue)

View 2 Replies

Forms Data Controls :: Handle Null Values Being Assigned To A Calendar Control?

Nov 13, 2010

I've got a detailsview control on a page. The table that it interacts with has a DateTime column in it. This column is nullable, and a lot of the records have null for that value. In the EditItemTemplate I've got a calendar control. When I try to put the DetailsView into edit mode, I get the following error message:

System.InvalidCastException was unhandled by user code
Message=Specified cast is not valid.
at ASP.entries_aspx.__DataBinding__control44(Object sender, EventArgs e) in c:inetpubwwwrootMediaLibraryEntries.aspx:line 103
at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding)
at System.Web.UI.Control.DataBindChildren()

I am convinced that the problem is the null values in the DateTime column of the table. I've done some web searches on this, and some have suggested placing some dummy values into that column, but that seems more like a kludge, rather than a solution. How do I keep nulls in the table, and yet not have that preceeding error come up when a user tries to edit the selected record?

View 1 Replies

Security :: Unable To Cast Object Of Type 'System.Security.Principal.GenericPrincipal' To Type 'System.Web.Se...

Nov 12, 2010

I have a web site that is using windows authentication. 'Enable anonymous access' is unchecked. It works when I call it through Visual Studio but when I put the site on the server I get the following error:

Unable to cast object of type 'System.Security.Principal.GenericPrincipal' to type 'System.Web.Security.RolePrincipal'.

Here is the offending line:

System.Security.Principal.GenericPrincipal genericPrincipal = (System.Security.Principal.GenericPrincipal)HttpContext.Current.User;

View 3 Replies

Member Names Cannot Be The Same As Their Enclosing Type?

Aug 20, 2010

when i try to run an web application in visual studio 2008.. i got this error...

'PopupWindow': member names cannot be the same as their enclosing type

also while correcting errors my startup web page changed..dont know how to setback the original startup webpage...

public partial class PopupWindow {
/// <summary>
/// frmPopupWindow control.
/// </summary>[code].....

View 1 Replies

Web Forms :: 'Run' Is Not A Member Of 'System.Web.HttpApplicationState'?

Jul 31, 2010

What is the deal here? I have eliminated all the errors with the exception of the above. I have to comment out

<STAThread()> _
Private Sub Main() Form())


View 17 Replies

Copyrights 2005-15, All rights reserved