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.

[Code]...



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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 i.id 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.

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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}

"

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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:-

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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:

[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

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DataSource Controls :: The Null Value Cannot Be Assigned To A Member With Type System.Int32

Jun 4, 2008

I have a problem:-
After learning linq.
I thought about testing it..
I have a table with the following fields.
name[..varcher(50)..notnull]
title[..varchar(50)..notnull]
id[..primary key..increment +1..int]

I have a linq to sql classes named dataclasses.dbml

here is my query

Dim db As New DataClassesDataContext
Dim p As New testing With {.name = "ad", .title = "adi"}
db.testings.InsertOnSubmit(p)
db.SubmitChanges()

Here is my error..It crashes on db.SubmitChanges()
With this error...

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

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

Dec 8, 2009

I have an error while trying to join two tables using LINQ:

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

The two tables are TableA (primary key field - A_pk) and TableB (primary key - B_pk). I need to pull all records (left join) from A with displaying to columns: A_pk and B_pk.

Now the problem is if B_pk is null, then I'm getting the error.

below is the code:[Code]....

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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:

[Authorize]
public ActionResult Index()
{
WebModel model = new WebModel();
ModelConverter.ConvertToModel(model, controller);
return View(model);
}
[Authorize]
[HttpPost]
[ValidateInput(false)]
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(); %>
<div>
<table width="100%">
<%foreach (var article in Model.Articles)
{%>
<tr style="text-align: right">
<td>
<%:Html.DropDownListFor(m=>m.Articles.FirstOrDefault(f=>f.ID == article.ID).ID, new SelectList(controller.CurrentProdukt.Articles.AsEnumerable(), "ID", "Name", article.ID)) %>
</td>
<td>
<%:Html.TextBoxFor(m => m.Articles.FirstOrDefault(f => f.ID == article.ID).ValueParam)%>
</td>
</tr>
<%} %>
</table>
</div>
<table style="width: 100%">
<tr>
<td>
<input type="submit" name="saveButton" value="Save" />
</td>
</tr>
</table>
<%Html.EndForm(); %>
</asp:Content>

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.

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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.

[Code]....

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.

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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'.

[code]....

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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,

[code]....

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MVC :: Error / Cast Object Of Type 'System.Data.Linq.DataQuery`1[System.Boolean]' To Type 'NerdDinner.Models.RSVP?

Aug 3, 2009

Unable to cast object of type 'System.Data.Linq.DataQuery`1[System.Boolean]' to type 'NerdDinner.Models.RSVP this message appear to me when executing that line of code

Controller Class

OrdersViewModel TestModel = new OrdersViewModel()
TestModel.rsvp = (NerdDinner.Models.RSVP) _db.RSVPs.Select(i => i.DinnerID == ID);
public class OrdersViewModel
{
public Dinner dinner {get;set;}
public RSVP rsvp { get; set; }
}
TestModel.rsvp must return list of rows

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Forms Data Controls :: Unable To Cast Object Of Type System.Int32 To Type System.String

Oct 6, 2009

When I attempt to display the educational Data per currently logged-in user, I got this error message"Unable to cast object of type 'System.Int32' to type 'System.String'."I can't however locate where this error originated from. Below are the aspx and aspx.cs of the page. Please help!

<asp:DetailsView ID="educationalresumeDetailsView" runat="server" Height="50px"
Width="100%" AutoGenerateRows="false" DataKeyNames="educational_id"
DataSourceID="educationalresumeLinqDataSource">
<Fields>
<asp:DynamicField DataField="resume_id" Visible="false" />
[code]...

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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

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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;
myConnection.Open();
myReader = myCommand.ExecuteReader();

When I try to retreive from the reader as follows:

while (myReader.Read())
{
string someString = myReader["UOPGM"];
lstNames.Items.Add(someString);
}

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

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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 =
new
SqlConnection(connectionstring);SqlCommand cmd =
new
[code]...

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Visual Studio :: Unable To Cast Object Of Type 'System.DBNull' To Type 'System.String

May 26, 2009

I'm creating an ASP.NET application with typed datasets under VS2005. When I run it, I get the following error:Unable to cast object of type 'System.DBNull' to type 'System.String'.I know exactly what the error means, but the problem is that the source code for the error is under :WINDOWSMicrosoft.NETFrameworkv2.0.50727Temporary ASP.NET Filesweba61dd3835a9abf1fApp_Code.vp5fbuvh.7.cs, as displayed by IE; when using typed datasets in a WINDOWS project, there is a .designer.cs file that contains code you can modify if you are getting this sort of casting error; however, in ASP.NET, this code appears to be generated "on the fly", thus of course making it impossible to modify to avoid the casting error.

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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[]'.

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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

[Code]....

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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'

[TextFixture]
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")
}

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

Nov 10, 2010

[Code]....

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.

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Databases :: Unable To Cast Object Of Type 'System.Guid' To Type 'System.Byte

Jun 9, 2009

MembershipUser user = Membership.GetUser(Thread.CurrentPrincipal.Identity.Name);
byte[] UserKey = (byte[])user.ProviderUserKey{"Unable to cast object of type 'System.Guid' to type 'System.Byte[]'."}in Oracle database userid/key has datatype RAW, therefore I need to convert user.ProviderUserKey in byte[].

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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 (asp.net/vb) works fine with FormView1_ItemCommand and FormView1_ItemInserted events but strangely objects to FormView1_ItemCreated. Is it only a VC# event?

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Unable To Cast Object Of Type System.DBNull To Type System.String

Dec 30, 2009

Exception Details: System.InvalidCastException: Unable to cast object of type 'System.DBNull' to type 'System.String'.

[Code]....

I am working on some ASPnet 3.5 C# examples from the Apress Book, Pro ASPnet 3.5 in C# 2008 by MacDonald and Szpuszta.
Running the ComponentTest.aspx of Chapter 8 popped up the above error message. The db of Line 47 is an instance of the
Data Utility Class, EmployeeDB, where there is a List<EmployeeDetails> GetEmployee() method.

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

Sep 17, 2010

[Code]....
System.InvalidCastException was unhandled by user code
Message=Unable to cast object of type 'System.Guid' to type 'System.String'.
Source=System.Data.Linq
System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execut

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Unable To Cast Object Of Type 'System.DBNull' To Type 'System.String'.

May 4, 2009

which is meant to check if an image is available and if it isnt it should show a default image however, it gives me this error whenever the image is null in the database.This is the function which returns the error;

protected
string FormatImageUrl(object url)
if ((url !=
DBNull.Value) && (url !=
null) && (url.ToString().Trim().Length > 0))
[code]...

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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:

[MetadataType(typeof(SPecials_TemplatesMetaData))]
public partial class SPecials_Templates
{
public class SPecials_TemplatesMetaData
{
[ScaffoldColumn(false)]
public object Key { get; set; }
[StringLength(50)]
public object Template_Name { get; set; }
[StringLength(12)]
public object Headline { get; set; }
[StringLength(12)]
public object headline2 { get; set; }
[StringLength(160)].......

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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)

</div>

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)

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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.
Source=App_Web_srpmlyjd
StackTrace:
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?

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Type (System.Web.UI.ScriptManager) Not Compatible With Type Of Control (System.Web.UI)

Mar 12, 2009

Parser Error Message: The base class includes the field 'ScriptManager1', but its type (System.Web.UI.ScriptManager) is not compatible with the type of control (System.Web.UI.ScriptManager).
Line 19: <div class="demo-area">
Line 20: <asp:ScriptManager ID="ScriptManager1" EnablePartialRendering="true" runat="server" />

I dragged a scriptManager control from the toolbox (also having same problem with an UpdatePanel control), and when I try to run the webapp, I get the error message above - specifically - in the webform's designer file. What do I need to do to fix this problem? I have references to system.web, in the CS file I have using System.Web.UI, but in the designer file is there something I need to do there? Or is there something I need to do in the aspx file?

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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;

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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].....

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Dec 8, 2009

[Code]....

This is the error to my onclick even of a button trying to pass and argument to my procedure call. Line 61 shows the button code. Here is the code for "testclick" procedure on my aspx.vb page. [Code]....

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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 Application.run...

<STAThread()> _
Private Sub Main()
Application.run(New Form())

[code]...

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Namespace Or Type Specified Doesn't Contain Public Member

Feb 15, 2010

I have created a ASP.NET 3.5 web application and in it I have SearchGridView.vb class file in the directory Old_App_Code. This file creates a namespace MyApp.WebControls, which is also referenced in web.config in a namespace tag, as well as included as an import directive at the beginning of my content page. Unfortunately, I receive the following error: Warning 1 Namespace or type specified in the project-level Imports 'MyApp.WebControls' doesn't contain any public member or cannot be found. Make sure the namespace or the type is defined and contains at least one public member. Make sure the imported element name doesn't use any aliases. Here's the first several lines of my class file SearchGridView.vb:

[Code]....

why this is happening, as well as possible fixes? I cannot impement the asp:SearchGridView due to this error.

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i'm trying to access the .net webservice in the C# project in VS2003, as soon as i set the refer to the asmx file and compile the project, it comes-up with an error mesage "member names cannot be the same as their enclosing type",,, but if i refer the same URL in VB.net it works fine...

but it errors only in C#...

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Feb 23, 2010

In this code snippet:

using (DataClassesDataContext myContext = new DataClassesDataContext())
{
var myEvents = (from ev in myContext.Events [code].....

So I'm thinking there must be something about the Event object that has been created for me that is causing the problem...?S

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Feb 24, 2010

I am using dropdownlist in my view page with some values which will display corresponding ID(primary key of other table) in my database.If i leave my dropdownlist blank and save it in database then its showing null parameter error. Can you explain how to use this reference type to overcome this error

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When Submit The Form And Returning ViewModel Of Type QuestionViewModel The Type Is Null

Jul 8, 2010

My problem is that when I submit the form and returning my viewModel of type QuestionViewModel - the Type is null.

See code below.

[code]....

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Mar 27, 2011

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