Databinding - .net - Dynamically Displaying Controls?
Jan 7, 2010
I am developing Quiz project. In DetailsView I want to display the Question and answers.
The number of answers vary for question to question.Say example
1 ) C# Support
(i) Generics
(ii) LINQ
(iii)EntLib
2 ) Find the odd one
(i) DB2
(ii) Oracle
(iii)MS-Access
(iv) Sql Server
(v) Javascript
so i can not fix the number of radio buttons.Some questions may have multiple answers.so i need to display checkboxes instead of radio buttons.
My Question is how to generate Radio Buttons or Checkboxed Dynamically ?
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Similar Messages:
Oct 25, 2010
When designing an ASP.NET user control my standard way for creating say a details view would be to create a property of the desired type on my page and would set the property in the page load based on the supplied query parameter. I feel I'm probably doing more work then necessary. If I could encase my view inside a container then I could merely have it databound and thus make everything declarative.My question is what would be the lightweight container/controls that would be appropriate for databinding a single object?As a second question, how can I handle invalid query strings with this method?
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Jun 24, 2010
I am using Menu control in asp.net. I am creating Menu control using xml databinding.
Here is the xml file;
<?xml version="1.0" encoding="utf-8" ?>
<Items Text="">
<Item Text="" ImgPath="./../images/home.gif" Url="" Value="Home" />
<Item Text="" ImgPath="" Url="" Value="Time Entry" >
<Item Text="" Value="Our Clients" ImgPath="./../images/oc.gif" Url="~/OurClients.aspx" />.....
But, it is returning null.
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Oct 26, 2010
I have a page to show a thread content, it take the ID of the thread from the query string.
depending on the ID, I show the content using the FormView control.
how could I then change the page title depending on the databinding result?
I've figured out that I can do that before the databinding in the Page_Load event, by querying the title of the thread depending on the ID from the QueryString object, but I'm wondering if I can achieve my goal during the databinding!
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Mar 29, 2010
i have a webpage in which there is a grdiview and a button . Gridview is binded on button's click event. My problem is that i am quering as400 to get that data in a datatable and bind datattable to the gridview, this query takes time to execute so i want to display progress bar or something like "please wait data is getting loaded" i dont know how to do that.
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Nov 10, 2010
I try to establish a dynamic HTML table with data for an item. i am getting trouble showing the image for the item, i am getting my data from the database, i have saved my image as image in the database, and i used byte[].
I have the following code for desplaying data:
protected void DDLitem_SelectedIndexChanged(object sender, EventArgs e)
{
var item = new ItemControl(); // this is in the BLL layer.
List<Goods> get = item.returnGoods(DDLGoods.SelectedItem.Text); // DDLGoods is a DropDownList. and the method returns a List<Goods>
var out = new StringBuilder();
out.Append("<table><tr><td>Name:</td><td>Designation:</td><td>Price:</td><td>Item Number:</td>");
foreach (var v in get)
{
out.Append("<tr><td>" + v.name + "</td><td>" + v.designation + "</td><td>" + v.price + "</td><td>" + v.itimId + "</td><td></tr>");
}
out.Append("</table>");
Label1.Text= out.ToString();
}
I need to wrigth in the foreach loop somethink that will desplay my v.image.
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Jan 3, 2010
On my Form Load event I am creating a bitmap using System.Drawing classes, and I want to display this image on my WebForm. How can I do that?
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Apr 28, 2010
I want to create a page that will dynamically change the images displayed, based on which link the user clicked to get there. For example I have different movies listed and when you click a link for one of them it displays all the images for that movie. I need it to be on one page because at the moment I have hundreds of pages and its very hard to manage. I have the images stored in BLOBS on SQL Server 2005. I can retrieve all the images for a certain category and store the Image data for each one into a list of images. What I cant do, is display the images on the page. I can display one image by using the queryString to get the image by ID, then putting the Eval code into an asp:image, but I dont know how to do it for multiple images.
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Feb 24, 2010
I need to query a database and return list of names, then I need to display their pictures and information in a Web Page, using ASP.NET or using JavaScript. The main concern is displaying the pictures and information dynamically on the page in an organized way.
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Jul 14, 2010
now i am facing the problem to validate the checkboxlist is displaying dynamically, acutally at my present page i am doing the checkboxlist which is controled by another check box for the checkboxlist items for select and deselect, now i need to handle the validation for this checkboxlist for null value
[Code]....
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Jan 23, 2011
Situation: I have a drop down list which I need to pass on to a webservice on button click. I am using Sys.Net.WebServiceProxy.Invoke to make webservice call.
Everything is happening inside a usercontrol which loads on runtime using dynamicpopulate extender.
I get following error:
Sys.InvalidOperationException: Cannot serialize object with cyclic reference within child properties.
Situation: Usercontrol also has a listview which is bound to dataset. However on calling listview.DataBind() in side the webservice method.
I get following error:
The ListView control 'ProductsListView' does not have a naming container. Ensure that the control is added to the page before calling DataBind.
There is no problem when call to service method is parameter less and listitem is not bound.
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Oct 17, 2010
I have noticed today that when you create a directory in code in a web application the resulting folder structure is not created in the solution explorer (It is fine on disk and app can still access all the files
I am not sure if there is a setting that I am missing or is this a bug?Steps to reproduce
Create a new C# web application in VS 2010. Create a new web page (Default.aspx) and add a file upload control and a button.on the click event on the button add the following code
[Code]....
When the form posts back refresh the solution explorer and the new directory does not appear.Check your file system and the file will be there.Not a massive issue but frustrating.
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Mar 29, 2011
I am using a treeview control and just want to add nodes dynamically. On selecting a node the results based on that node must be shown below.
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Apr 20, 2010
Nifty and free asp.net controls that replicate the following databinding technique? [URL]
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Mar 2, 2012
I have a SQL table containing a list of questions which admin users can add new questions too as and when they feel necessary.
I have a web form with a Repeater which displays these questions next to a checkbox and a textbox. When the user clicks the checkbox or the enteres data textbox I want to click and update button and store this data in a different table.
My current thinking is that this would go into a table with 30 bit fields for the checkbox values (c1-c30) and 30 text fields for the textboxes (t1-t30).
This would allow the admins upto 30 questions in the database at anyone time.
The question is how do i bind the controls in each row of the Repeater to its corrosponding SQL database field i.e row1 t1 and c1, row 2 t2 and c2 etc.
Code:
Protected Sub Repeater1_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.RepeaterItemEventArgs) Handles Repeater1.ItemDataBound
Dim i = 0
Dim item As RepeaterItem
Dim checkBox As CheckBox = e.Item.FindControl("CheckBox5")
[Code]...
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Nov 29, 2010
I want to create a form that will update an existing database record based on a querystring value passed to the page say UserId.
Rather then using data-bound controls such as the FormView, DetailsView, etc, I would like to use textbox controls, a dropdownlist and a checkboxlist to accomplish this alone. Is this possible? How do I go about binding the data from the database to these controls when the page is loaded and what data source should I create?
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May 18, 2010
I am trying to bind a FormView on runtime in codebehind (instead of using predefined datasource).
[Code]....
GetCase will return a DataTable with just 1 row.Then on my aspx:
<asp:FormView DefaultMode="ReadOnly" runat="server" ID="FormView1" DataKeyNames="complaint_ID">
<ItemTemplate>
<asp:Label ID="lblComplaintID" runat="server" Text="<% Eval('case_ID'); %>" />
</ItemTemplate>
</asp:FormView>
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Sep 27, 2010
I'm wondering why I'm getting value 0 for both "NumberOfReplies" &NumberOfRepliesinPercent ?
[Code]....
<asp:Repeater id="rptReplies" runat="server">
<%#DataBinder.Eval(Container.DataItem, "NumberOfReplies")%>
<%#DataBinder.Eval(Container.DataItem, "NumberOfRepliesinPercent")%>
[code]...
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Mar 3, 2010
I was wondering about some best practices for data binding in web forms. For example we have a control:
public partial class MyUserControl : UserControl
{
public override void DataBind()
{[code]...
If we wanted that control to bind its data automatically we would do something like this:
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)[code]...
In the first section of code if we do our data binding before the call to base.DataBind() (#1) then that means that, if for example we databind a ListView, we don't have to call ListView.DataBind() because when we call base.DataBind() on our control it recursively calls DataBind on all child controls. Also, we won't have access to any of the properties of the control that were assigned to it using the data binding code blocks <%# %>
If we do our binding on our controls after base.DataBind() (#2) then this means that DataBind is called on these controls twice. Once when base.DataBind() is called, and the second time when we are forced to call control.DataBind(). I can follow here that I don't know about?
EDIT: Looking at this page:
http://msdn.microsoft.com/en-us/library/w5e5992d.aspx
Use this method to bind data from a source to a server control. This method is commonly used after retrieving a data set through a database query. The method is primarily used by control developers; most controls perform data binding automatically.It appears that best practice is to bind controls data automatically. Databinding is for when we explicitly set a data source.
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Mar 26, 2010
Recently I was asked the following question at interview."What are the different way to bind a Data Control in ASP.Net".
I have answered
Typed DataSet
Collections
Stored Procedure.
The interviewer expecting a lot more. Can anyone explain me the different way that we can bind the data controls?
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Mar 29, 2010
I have a gridview in which I have two drop downs. One is populated with values that are static, so I have a regular sub that does that in the code behind. I tried to add code for databinding the other ddl to a datatable. I cannot get this to work. It just comes up empty. My asp code is fine, and the datatable definately has data in it - just nothing gets populated.
One other thing - the code for the static ddl has worked fine, but when I add this other block (either to the same sub as that, or dow the rowdatabound event) the static one doesn't work either.
[Code]....
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Oct 24, 2010
Inside my repeater I'm calling an extension method like so:
[Code]....
he above is giving me an "Object not set to an instance of a object" exception inside the extension method. If I comment the above expression out, it works fine, and the items are binded wtih no problems.
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Sep 18, 2010
im trying to use dynamic object in a databinding tag , it gives me error that the property does not exists even though i can see all the properties there in the vs debug mode
here is what im trying to do:
C#:
my method signature:
public static dynamic MyMethod()
ASPX:
in control itemtemplate:
<%# MyMethod().SomeProperty %>
if also trite the other way:
C#:
public static object MyMethod()
ASPX:
<%# ((dymanic)MyMethod() ).SomeProperty%>
But i dont know why it cant resolve the properties , even though i can see them when the databinder control throws an exception (its working fine outside the databinder tag (ie normal aspx tags <% %>)
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Sep 30, 2010
I have a GV & a FV both linked to same sqldatasource.
When a GV row is clicked, the FV becomes available for editing the row but the GV as a result is reduced to only that row. I want to GV to remain showing all rows. I am using GV selected_index event to invoke "SqlDataSource1.SelectCommand=
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Nov 12, 2010
somewhere on the net I found very useful example of programatically databainding the treeview control (code blow). I use this treeview as menu bar in my masterpage. It works fine but with one exception: when I click the node of this treeview I'm redirected to the correct page but after page is reloaded my treeview is collapsed and node I chose just before is not highlighted. What to do to correct this problem. Do you know better examples of programatically databainding of the treeview control? Maybe it will be better to bind data to the sitemapdatasource and next to the treeview. Then I shouldn't have to worried about this?
[Code]....
Regards. Pawel
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