Polymorphism And Databinding To A Datagrid?
Feb 10, 2010[Code]....
polymorphism and databinding to a datagrid?
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void MyMethod();
}.....
So, at least I haven't completely misunderstood that. I am unsure exactly how I am to write a method that accepts a generic collection of classes that conform to the same interface.
I have a plan to completely hack around this problem if need be, but I would really prefer to do it properly.
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[code]....
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I added a column for selecting:
<asp:TemplateField ShowHeader="False">
<ItemTemplate>
<asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False" CommandName="Select"
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</asp:TemplateField>
I know how to handle the filtering of the grid (create a criteria and set to rowfilter of the dataview) But, I dont know how to get the value of the column of the selected row.
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[Code]....
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Sep 22, 2010 Simply put... I want to duplicate the example found at this link, in VB.net rather than C#.
[URL]
I would like the selectedvalue of the dropdown to display additional data base on its selection in multiple text boxes.
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View 2 RepliesForms Data Controls :: Datagrid With Column Choose To Choose Columns Dynamically Using DataGrid With Object Data Sour
Sep 30, 2010I have "Order" object with Columns Ticket,OTP and CustomerName etc.Intially on DataGrid, I'm binding Ticket only , when user clicks on "Column Chooser" button, another windows appears to pickup CustomerName,OTP columns to add specified column dynamically on Datagrid. Environment : Asp.net ,C# with Object Data source
Public Class Order
{
publc void Order()
{
}
public string Ticket
{
get
{
return this.strTicket;
}
set
{
this.strTicket = value;
}
}
public string OtpNumber
{
get
{
return this.strOtpNumber;
}
set
{
this.strOtpNumber = value;
}
}
public string CustomerName
{
get
{
return this.strCustomer;
}
set
{
this.strCustomer = value;
}
}
}
}
How To Do Databinding On Postback
Jul 8, 2010Working on an ASP.NET 4.0 project, which uses user controls to dynamically generate a form based on definitions stored in the database. One form field would look like this:
[code]....
Behind the scenes the control emits a RegularExpressionValidator based on the RefControl.ValidationFormat property.
This works fine, however the problem is that this architecture only allows us to validate with regexes. Now I need to add date format validation, based on the user's preferences (which aren't dependent on their UICulture).
Reluctant to refactor the entire user control setup, I need to be able to pass a on-the-fly regex pattern to the ValidationFormat property. Currently I'm using a data binding expression to bind the property to a page instance method:
[code]....
Works okay on first page load, but on subsequent postbacks the validation doesn't work. I think the issue is that the data binding expression doesn't evaluate at all, but I'm not sure I understand why. I'm calling Page.DataBind() in Page_Init whether Page.IsPostBack or not, so shouldn't this work?
If you see I'm barking up the wrong tree, any alternative solutions to the same problem are also welcome.
EDIT
Managed to solve this problem. The issue was with the way ASP.NET page life cycle invokes the user control's events before the page's own events. The control values were being initialized before the data binding on the page could happen.
Because I still need to do the control initialization before Page_Load to subscribe the controls to viewstate, I simply moved the initialization logic to the Page.InitComplete event so the call to Page.DataBind() could get called first.
protected void Page_Init(object sender, EventArgs e)
{
Page.InitComplete += new EventHandler(Page_InitComplete);
}
So the event tree becomes
User Control Page_Init => Hook InitComplete handler
Page (aspx) Page_Init => Bind data
User Control Page_InitComplete => Initialize the control
C# - Databinding Does Not Work?
Dec 12, 2010In MainPage.aspx I have
<asp:HyperLink runat="server" NavigateUrl='<%#"http://google.pl"%>'>test</asp:HyperLink>
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When I do:
<asp:HyperLink runat="server" NavigateUrl='http://google.pl'>test</asp:HyperLink>
It works fine.
Why <%#"http://google.pl"%> does not work ?
How to debug it ?
Databinding With LINQ?
Aug 2, 2010I'm databinding a radiobuttonlist with a LINQ query like so:
var query = from m in Db.Udt_Menu
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this.radMenuSelection.DataValueField = "menuID";
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this.radMenuSelection.DataSource = query;
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However, when i want to update the record I need to set the selectedindex of the radiobutton to a value from the database. There is a table called udt_PageMenuSelection which has a column called menuID which is a foreign key to udt_Menu.menuID.
When i want to update an existing record, how do i set the selectedindex of the radiolist to the value equal to udt_PageMenuSelection.menuID ?
Do I need to do an additional query?
Databinding Gridview To Datatable?
Feb 18, 2011basically I had a repeater that i needed to be able to now update row by row. I thought the easiest way would be to replace with a datagrid.
Here is the code:
Code:
[code]....
If I take away the select filtering, I then get this error on rowdatabound
Unable to cast object of type 'System.Data.DataRowView' to type 'System.Data.DataRow'.
Databinding - How To Bind With Some Textbox
Oct 25, 2010I have in my code behind the following property
public string Firstname {get;set;}
when I want to bind it to some textbox I do the following:
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then I want value put in this textbox to be set in my Firstname property (because I want to process it e.g. save this value) in my presenter.
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How To Put Code Into PreRender Such As Databinding
May 19, 2010Would a call to a database be called if you put the databind method in the PreRender event of a listbox and the listbox was rendered on the screen for example? This is a specific example regarding a listbox, but basically does code in PreRender only get called if the control is rendered on the screen. If this is so, is it good practice to put code into PreRender such as databinding?
View 1 RepliesDataBinding Not Working In UserControl?
Jul 30, 2010[code]....
((Alert)Container.DataItem).AlertId.ToString() the value I get for SystemObjectRecordId in debug is null (but it still works when assigned to the text attribute of a literal).
5) The location of the User Control is default.aspx and the control is comments.ascx. The code files do not share a namespace.
6) I have tried manipulating the OnItemDataBound property of my repeater but since I have proven with the literal that data is getting bound using a declarative value I am not sure what else I could be doing inside the method logic of OnItemDataBound.
Once the end-user makes a comment in the UI, the SystemObjectRecordId value (which should have already been assigned when the page loaded - and we know it does in the case of the literal) should get passed to the codebehind of the custom usercontrol:
[code]....
No matter what I do, I always get zero for SystemObjectRecordId when passed via the custom user control I have on my default.aspx page.
AJAX :: Databinding The Accordion?
Jan 3, 2011I'm having trouble with my accordion control. I'm trying to databind the control using my code- behind, but I can't seem to populate the accordion
My .aspx code is:
[Code]....
and my code- behind is:
[Code]....
C# - Databinding Two Sql Tables To One Repeater?
Oct 26, 2010I'm very new to using Linq-to-SQL, that's why I'm asking this question. I've searched the site, but can't seem to figure out how to do this.
My problem is:
I have a database mapped with LINQ to SQL:
Table 1: PersonalTasks
TaskId
Header
[Content]
IsDone
CreatedDate
Table 2: Comments
CommentId
TaskId
UserId
Comment
CreatedDate
I have a repeater:
<asp:Repeater ID="PersonalTaskRepeater" runat="server">
<ItemTemplate>
<%#Eval("Header") %>
<%# Eval("Content") %>
Task done: <asp:CheckBox ID="IsDoneCheckBox" runat="server" Checked='<%#Eval("IsDone") %>' /><img src="Images/tick-circle.png" />
Here i want to access the comment table, with the comments related to the taskID
</ItemTemplate>
</asp:Repeater>
I've tried using: <%#Eval("Comment.Comment1")%> but that throws this error:
DataBinding:
'System.Data.Linq.EntitySet`1[[Assistr.Models.Comment,
Assistr, Version=1.0.0.0,
Culture=neutral,
PublicKeyToken=null]]' does not
contain a property with the name
'Comment'.
My code-behind:
var tasks = db.PersonalTasks.OrderBy(x => x.IsDone).ToList();
PersonalTaskRepeater.DataSource = tasks;
PersonalTaskRepeater.DataBind();
Do I need to use 2 repeaters to do what I want to do or? :)
Web Forms :: DataBinding With Expression Builders?
Sep 22, 2010I'm trying to build a webpage without using any asp.net data binding controls ( listview, repeaters etc.)that I'm trying to do is to use stored procedure to get all necessary items, loop through them, and bind to labels, images etc.The problem is when i want to repeat .aspx code. I'm able to do everything i want in c#, but it's really pain to create all the necessary html elements such breaklines, spans, textboxes and so on.I tried to use expression builders, but it only repeats the last value from database.
Here is my code(ASPX):
[Code]....
c# code:
[Code]....
Web Forms :: Use Databinding Option In Wizard?
Oct 10, 2010I have Wizard steps in a a Wizard control. Each step looks like a form with textboxes and dropdowns for users to complete. I don't want to lose the data as user completes each of the wizard step.
1. I'm thinking about saving user input to sql database when user clicks the next button with each wizard step but I wonder if this is wise since it would create many runs and writes to the server? If not the best way then what method should I use? I just don't want user to lose data if browser crash or for any reason.
2. Or should I use the DataBinding option in the Wizard? Would this be a better performance?
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