I have a textbox that I use to gather a date. I would like to have the database store a null if this field is left blank by the user when submitting. I am using the following on my aspx page:
Every single parameter is bound just fine except toDate which turns out to be always null. When inspecting the Request.QueryString["toDate"] it retrives the right value which is 30/09/2010. It seems that DateTime expects another format when binding. What is the right format?
[System.Web.Script.Services.ScriptService] public class Quotes : System.Web.Services.WebService { ebMethod] public void Calculate(int param1, int? param2)
i m using Datalist control on that i have one section as a "Qty" which come from database .now how i can pass two values in <asp:parameter from database
if i write anywhere in datalist then it worlks , but not in this DefaultValue parameter , coz whenever that datalist item get bound one by one row then DefaultValue may get change and depend on that Default value my Quantity section also get changenx
i have dll in which i have writter function for filling dataset, so i want to pass field name of the table as a parameter to thid dlli dont know how to give quotes to the parameter.i am passing the parameter as a string
I am a c#/asp.net developer and I am having to work on a VB/asp.net. I started out with VB.NET but after years away from it I'm getting confused with the syntax.
I have two variables
Dim originalDate as DateTime? Dim newDate as DateTime?
Both nullable datetimes, originalDate is a nullable date I am getting from the database and newDate time is set in code, I need to compare them, they can either both have dates, neither have dates or one have and one not.
I have a bit of code as follows:
if origEndDate = origEndDate then
When both origEndDate and origEndDate are "nothing" this statement is false (well when I run it in the watch window it comes back as nothing)!
I don't understand why this is the case because I was under the impression doing an "=" compares the two values and as they are the same surely it should be true?
What syntax should I be using as in C# I can do the above as so:
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.
Is there a way to use the OrderBy command in Linq with a DateTime field using the Date portion only (without the Time Stamp portion) that is nullable such as in the following query?
var query1 = from myTable in MyTable where myTable.EnteredDate != null group myTable by myTable.EnteredDate into myOutput[code]....
Since myTable.EnteredDate is a DateTime field that can contain nulls, it does not support the .Date conversion call such as myTable.EnteredDate.Date
Is there a way to convert the myTable.EnteredDate field into a date only string in the group by portion?
I am having a problem with the Client Validation not firing when I have marked a nullable DateTime field as [Required] and the value of the field is null. (It is actually stopping ALL client validation on the page working - not just the DateTime field).
Interestingly enough, once a post back has been done and the error picked up on the server, the client validation starts working.
Also if you set the date to a none null value (see commented out line in the controller) it will also work
I have replicated this behaviour in a small test project (this is deliberately very Noddy - just enough to replicate the problem)
Am I doing something fundamentally wrong or am I looking at coding some sort of work around here? (I realise that a Required nullable field sounds like a bit of a oxymoron, but I wanted to present the user with a blank field which they must then fill, not one pre-populated with an arbitrary date value)
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
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.
I spent about 60 minutes sifting through search engine listings trying to figure this out and couldn't find an answer, so I decided to make this post for others.
Situation: Using a Stored Procedure to insert a row and return the new row ID, explained here. In my case, I used the Idenity_Scope to return the new row, like so:
[Code]....
Next, following steps as described in link above, went into the dataset XSD page, configured the table adapter to use this stored procedure. By default, it wanted my return value to be set to some value, but I set to allow Null (makes sense, since I don't want to pass the value in, I want to get it out, so it should be null to begin with).
Problem: Where I ran into an issue was in the method to call this stored procedure. The intellisense displayed the prototype it was expecting, basicly like this:
Dim query as String = "Select * from openquery (devbook, 'SELECT wb.arrival_time FROM web_bookings wb ')"All I need is to convert my arrival_time into a datetime field in the query
I have a Visual Studio 2008 solution that when I build, returns the following error:
Ticks must be between DateTime.MinValue.Ticks and DateTime.MaxValue.Ticks. Parameter name: ticks
There is no reference file/line/column in the error. Becoming quite frustrating as the solution builds in the end, however I cannot debug.In the solution, there is no reference/using to DateTime.MinValue.Ticks at all...
EDIT:
There are only 2 references to ticks in my solution, and neither of those are causing the issue.There are no constructor issues with DateTime either. I do not believe it is related to DateTime or ticks at all.I have found a similar reference where it turned out to be a corrupt image file in the solution, where it did not have a date-modified value. This is not affecting mine though.
How do you use the http POST method with a Grid View on another page. I am trying to use the POST method to send the ID from the selected row of a Grid View, I am using a link button set to fire the select command and it has the Post Back URL set, from one page and then retrieve the ID value on another page using an Object Data Source. Also, under the Defining Parameters, I am setting the ID parameter to Form Parameter Source and have entered the Grid Views name in the Form Field.
I have a form and I want to insert the current time at which the user clicks to insert into the table of my db. When running, I get the following error when trying to insert into my sqldatasource:
"System.FormatException: String was not recognized as a valid DateTime."
I have written a code to insert emp details into database and i am also inserting local date(i,e system date) into to the table to know/have an idea at what date the employee inserted details. I have set date format add/MM/yyyy and its working well in my local system, but after uploading the site into server (the server is shared server) iam getting error and the error message is Failed to convert parameter value from a String to a DateTime.
Surprisingly, it is working well in server when i chaged the date format to MM/dd/yyyy, but now its not working in my local system and getting the same error.
I retrieve the date & time from datetime field in sql using a reader:
[Code]....
This value returns e.g. 15/04/2010 8:00:00 but I would like to split the day value (15), month value (4) etc from the overall datetime value, so I can assign dropdowns with corresponding (preselected) day, hour selection ..I know the dropdown assignment process, but I can't get the datetime field/value split ..
I'm having a problem understanding how to use TextBoxFor with a DateTime field (in particular how to add htmlAttributes). MVC has helpfully scaffolded the following for me:
[Code]....
I now want to add an htmlAttribute to this, to make the rendered <input> element read-only, for example: new {@readonly="true"} The problem I have, is that the MSDN documentation for TextBoxFor (see [URL] says only allows two arguments are allowed, the LINQ expression, and a dictionary or object containing the htmlAttributes. So I have two questions:
1. What is the role of "String.Format("{0:g}", Model.LastPolled)" in the scaffolded version? This obviously works, but doesn't seem to be an htmlAttribute.
2. How should I modify the scaffolded version so that the readonly attribute will be used?
I am using and EntityDateSource and I add where condition to filter the data at runtime and then bind the grid to the dataSource, but I am getting following error:-
The argument types 'Edm.DateTime' and 'Edm.String' are incompatible for this operation.
