MVC :: System.Nullable Doesn't Accept (int?) Null?

Jul 21, 2010

My designer.cs file of all the SQL tables is generated by LINQ-TO-SQL. The class and attribute in question is like this.

[global::System.Data.Linq.Mapping.TableAttribute(Name="dbo.Transfers")]
public
partial
class
Transfer :INotifyPropertyChanging,[code]...

I need to assign a null to the attribute so that the value 0 does not get save to the database.

View 2 Replies


Similar Messages:

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

MVC :: Validation Doesn't Accept Dropdownlist Null Value?

Jan 8, 2010

I'm currently stuck with a problem with MVC2 RC and validation on a dropdownlist :

I have a page with some fields and a dropdownlist. The dropdownlist is not a mandatory field so I would like to save a null value into my property.

Unfortunately, I can't validate my page with a null selected value, because when I look into the modelstate just on the first line of my action, I've already an error telling me I must choose an item.

Is it normal working of dropdownlist validation or is it a bug ?

View 6 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:

[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

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.

View 1 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)

</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)

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.

[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.

View 1 Replies

C# Null Syntax - How To Set A Field To Be Nullable

Feb 6, 2011

I remember being told that you can add some syntax to the end of a statement that will do something if the field is null. Pretty vague, but I cant seem to find anything about it via google.

I definitely isnt how to set a field to be nullable. I know that.

Here is an example of what I want.

int? field1 = 0;

field1 = int.parse(string2); (where string2 is a passed value, that could be null)

I thought there was something you could put at ?? if it is a null, such as:

field1 = int.parse(string2) ??;

Or do I have to check every if every string2 is null before making that statement.

View 16 Replies

Update Nullable Column In Db To Null?

Sep 13, 2010

Can anyone reliably get the EDS to save a nullable column to the databse as a "null" when bound to any of the controls such as "FormView"?I have tried using several different UpdateParameters (Session, ControlParamater, Parameter, etc). I have tried setting "ConvertEmptyStringToNull" to true and leaving the property off entirely. Nothing works. On my "Inserts" it works fine.(I have made sure the column is set to nullable = true in the Entity Designer.....)

View 7 Replies

C# - Unable To Set A Nullable Int To Null In A Ternary If Statement?

May 4, 2010

The C# code below:

int? i;
i = (true ? null : 0);

gives me the error:

Type of conditional expression cannot be determined because there is no implicit conversion between '<null>' and 'int' Shouldn't this be valid?

View 3 Replies

MVC :: Nullable DateTime Give Invalid Modelstate If Null?

Mar 19, 2011

Got a nullable datetime member on my viewmodel.the moment it hit my controller action, the viewmodel's modelstate allready are invalid (because the member is null).Forgot...how that works? (using MVC2)Basically my viewmodel have a social security number, passport number and passport expiracy date.If the ssn is entered, I want to ignore the two passport related fields, so I made the expiracy date member nullable.

Like all other viewmodels in this app, each model have it's own validation function that will do validation, and in there I add an error that the date is required or not valid (if using passport number). mvc itself should not care about the date at all.I dont want to give the date a default value, because then the date will show when the form loads, and it must be an empty field (unless I already got a date of course.

View 4 Replies

Implications Of Changing Column From Not Null To Nullable In Entity Framework?

Apr 1, 2011

I have to change the username column in my database to nullable, which means everywhere in my code, I now have to check username.HasValue and change references to username to username.Value. Is there anything I can do to avoid having to change all the references to username to username.Value?

View 1 Replies

How To Pass Null To A Nullable Parameter Of A .NET Web Service Method Via Javascript

Aug 24, 2010

[System.Web.Script.Services.ScriptService]
public class Quotes : System.Web.Services.WebService
{
ebMethod]
public void Calculate(int param1, int? param2)

View 2 Replies

C# - Binding Nullable Bit Database Column To CheckBox In GridView - Crash When Null

Nov 24, 2010

I'm trying to bind a nullable bit column, which at the moment is mostly null, but I need to somehow convert the null to a 'false' on runtime because it doesn't bind to a checkbox if it's null. But, I am currently unable to change the default value and update all records accordingly - is there a way to do this in runtime?

View 2 Replies

Allow Sql Sp To Accept A Null Value For A Parameter (sometimes.. Not All The Time)?

Jul 28, 2010

I'm trying to write a query that will work in two situations. In some situations the value for AOL will be Null and in others there will be a vnumeric value. How do I get this procedure to accept Null if its passed in but also accept a numeric value if it's passed in?

[Code]....

View 3 Replies

Web Forms :: Accept Textbox Value Even If It's Null?

Jun 14, 2010

I have a javascript to validate and avoid null values for my form but there are some textboxes that I need to be 'optional'. I tried erasing the validation for province address and province contact in javascript to make it optional, but the problem is whenever I add the values in the database, an error message appears "Input string was not in a correct format". It's in C# This is my present code wherein the provincial address and provincial contact must only be optional:

protected void submitButton_Click(object sender, EventArgs e)

View 15 Replies

DataSource Controls :: Query A Nullable System.DateTime Column?

Apr 23, 2010

Am I going to be able to query (using LINQ to SQL) a database field with a type like the following "public System.Nullable<System.DateTime> Spouse_DOB"?

I'm trying to use the following code: [Code]....

and I get the error "'System.Nullable<System.DateTime>' does not contain a definition for 'Month' and no extension method 'Month' accepting a first argument of type 'System.Nullable<System.DateTime>' could be found (are you missing a using directive or an assembly reference?)"

Is it because this DateTime column allows a NULL value (since everyone isn't married in my database)?

Error 1 'System.Nullable<System.DateTime>' does not contain a definition for 'Month' and no extension method 'Month' accepting a first argument of type 'System.Nullable<System.DateTime>' could be found (are you missing a using directive or an assembly reference?)
C:Working WebsitesGrannys Clan Address BookDefault.aspx.cs
38 26
C:Working WebsitesGrannys Clan Addres

View 1 Replies

VS 2010 Textbox On Webform Doesn´t Accept Input?

Mar 25, 2011

I´m creating a user page to enable editing their profiles. When hitting the "update" button, it turns out that the field still contains the old value, although you´re looking at the new one, ie the text property of the textbox isn´t the value of the parameter which in fact gets its value from the text property.As far as I know I haven´t done anything I haven´t done before, both in apps and website?

Fuga.
Code:
Update Persons set [First Name] = @First
Code:
.Parameters.AddWithValue("@First", Microsoft.VisualBasic.Trim(Me.TextBox1.Text))

View 5 Replies

Web Forms :: How To Add Validation So It Doesn't Accept Empty Strings Or Numbers

Jan 6, 2010

i am using a search box for my application which returns a dataset. however when i click on the search button it returns an empty table result. how could i add validation so it doesnt accept empty strings or numbers.

View 9 Replies

Web Forms :: RangeValidator Doesn't Accept Integer With Group Separator?

Sep 20, 2010

I need to validate integer within a specified range for English and French culture. The integer contains group separator ("," in English culture or " " in French culture). It seems I can't do it with RangeValidator on my machine.

I just want to make sure the RangeValidator can't do this kind validation for Integer before I'm going to write my own control.

I just feel curious because RangeValidator can actually do this kind of validation for Currency!

View 1 Replies

Custom Server Controls :: Web User Control Doesn't Accept It's Property

May 22, 2010

[Code]....

When i add this control to a page i set it's address with Address property. But it never sets it's address property like this :

[Code]....

When i try it like above, it always set address null. So it never goes to webpage that i want. It's result in the address bar always like this :

http://localhost:4533/TarihKoruma/?Date=12.05.2010 but i want it like this :
http://localhost:4533/TarihKoruma/Events.aspx?Date=12.05.2010

View 6 Replies

Web Forms :: Amount Textfield Doesn't Accept Comma Separated Values?

Jun 23, 2010

I have an invoice form where user enters items and amount. I am calculating the amount as the user enters amount in the textfield. I receive an error (Input String was not in correct format) if user enters amount with comma separated values. If there are no commas, my calculation goes through fine.

View 25 Replies

How To Write Extension Methods For Both Nullable And Not Nullable

Nov 10, 2010

I've written the following Extension Method

<Extension()>
Public Function ToUtcIso8601(ByVal dt As Date) As String
Return String.Format("{0:s}Z", dt)
End Function

But I also need a Nullable version of the same method... how exactly do I do this?

This is what I was thinking, but I'm not sure if this is the right way

[code]....

View 1 Replies

SQL Server :: Set 0 If Value Is Null Doesn't Work?

Mar 29, 2011

I have the below stored procedure witch has an error I cann't figure out.

What I want: Gets rankOrder. If rankOrder doesn't have a value (= null) the @num should be insertet as 1 as value. If there is a row and a rankOrder is should set the @num to insert the value + 1. The last one works perfect. But when the row I select is emty = null value the value is set to null in the insert command.

Stored procecure:

[Code]....

View 4 Replies

JobStream Is Always Null, Using System.Printing?

Jan 12, 2011

I was trying to read a data of a Job stream using a System.Printing name space, from a default print queue. I can get all the job info, like number of pages, but the JobStream data is always null, is there a solution for that? or is it broken or a bug. Here is my code

foreach (PrintSystemJobInfo
Job in
defaultPrintQueue.GetPrintJobInfoCollection())

[code]...

View 1 Replies







Copyrights 2005-15 www.BigResource.com, All rights reserved