Databinding - Control For Displaying Single Items?
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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Oct 26, 2010
What I'm trying to do is on page load display either of two controls based on how many items are in a datalist. For instance, if the datalist only contains 1 item I want it to display
Literal1.Visible = true;
If there is more than 1 item in the datalist, show
LiteralMulti.Visible = true;
Anyone know how to do this?
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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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Oct 11, 2010
I have a webForm which host a gridview and a formview. The formview is used for showing/editing a record which the user Select from the gridview.
In the formview Edit template I used DropDownList controls with
SelectedValue='<% bind("datafield")%>'
for enabling the user easier interface. A few of the DropDownList controls need to have a list of 100 items and I want to load the items from code behind and not from the aspx.
I tried to update the DDL's from FormView.Load, FormView.ModeChanging, FormView.PreRender but
nothing I am getting an error like this:
[code]....
How do I load the DropDownList controls with items BEFORE the form databinding occurs.
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Sep 13, 2010
For my site, I have a list of users and a list of events. I will be assigning users to each event. I have a table named EventUsers to hold this data:
EventUsers
EventID | UserID
1 | 123
1 | 456
2 | 789
On my page, I want to be able to add and remove users for a certain event. I could have a dropdown populated with users and an "Add" button next to it, then when I want to add a user, I pick one and click "Add". There would be a grid below it displaying all the users for the event, with "Delete" buttons for each one. The downside to this is that a database call is made for every Add and Delete.
Another option is to have two listboxes on the page - one on the left containing all users in the database, and another on the right which will contain users for the given event, and I can just add or remove from the list on the right. Then when I'm done, I click save, and it makes one database call. The only issue is that if I'm removing and adding, I'll have to delete every record in my EventUsers table for that event, and then add the changes. I've run into this before, and I've always gone with the dropdown method. What's the preferred method here?
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May 13, 2010
i have a countries list. Each user can check multiple countries. Once saved, this "user country list" will be used to get whether other users fit into countries certain user chose.
Question is what would be the most efficient approach to this problem...
I have one, one to save user selection as delimited list like Canada,USA,France ... in single varchar(max) field but problem with it would be that once user from Germany enters page i perform this check on. To search for Germany i would be needed to get all items and un-delimit each field to check against value or to use sql 'like' which again is pretty damn slow...
Just to make sure, many users will have their own selections of countries from which and only they want to have users to land on their page. While millions of users will reach those pages. So the faster approach will be the better.
technology, MSSQL and ASP.NET
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Jan 13, 2011
I've been trying to figure out for a long time now how to create an interface that can allows users to input several rows of data and pass those entries into an SQL server database all in one shot. I could not get any better ideas so I came up with this (see picture below).
What I envisioned is that the user enters values in the textboxes and hits the "add to list" button. The values are then populated in the list box below with the heading "exhibits lists" and when the add exhibit button is pressed, all values from the list box are passed into the database.
Well, I'm left wondering again if it would be possible to tie these values from the textboxes to the list box and whether I'd be able to pass them into the database.
how to go about it otherwise I'd be glad if you could recommend a better way for me to handle the situation otherwise I'd have to resolve to data entry one at a time.
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Sep 8, 2010
I want to generate the two crystal reports one is employee and another is project. Now I want to display the two reports in a single crystal report viewer. I've tried using sub-reports but the page header is not available in a sub reports. So I want to display two separate crystalreports in a single viewer.
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Mar 6, 2011
I am using AjaxToolkit ComboBox in my application
<ajaxtoolkit:ComboBox ID="ComboBox1" runat="server" AutoCompleteMode="Suggest"
AutoPostBack="True" DropDownStyle="DropDownList">
<asp:ListItem>One</asp:ListItem>
<asp:ListItem>Two</asp:ListItem>
<asp:ListItem>Three</asp:ListItem>
</ajaxtoolkit:ComboBox>
On running the application, i see the ComboBox but none of the list items are visible. Clicking on the dropdown button does not show anything also. Accessing the SelectedItem property shows that the first item is selected.
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Nov 15, 2010
I am trying to bind companyID value into a NavigateURL string property of a hyperlink which happens to be in the itemtemplate of the readonly formview control. Here is the code:
[Code]....
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Mar 24, 2010
This is something thats been bugging me for a while. I can't even remember if I fixed this before or not. What I'm trying to do is display a single error message for all validation controls on my page. I think this is possible if you write your own javascript function for a Custom Control, hiding the error message, and displaying it on a single control. Writting all the javascript for this and then refering to the control with "GetElementByID". But can I use controls like RequiredFieldValidator, and make them display messages on one single control without having to write javascript for each one of them? One single message on one single literal or label or whatever, at the bottom of the page, that says "fill in the compulsary fields" or something
similar. I find it very annoying having a list of validators underneath each other with different messages.
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Mar 24, 2011
I need a program that lets me enter the name of an item to swap and adds it to an array list when a button Add is pressed.
Once the item is added to the array list a sub procedure should be called which displays the contents of the array list in a list box.
The system will also allow me to remove items from the array list and then the list box is updated.
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Jan 18, 2010
I am working with grid view and tree view. My requirement is when the item is selcted in the gridview it should bind it to the particular node of tree view. Can you please help me out. Its very urgent. Can you please send me with the sample code.
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Mar 20, 2010
i want to change , the displaying items in a grid view and on the way the text value of a lable at the same click on a link ... ? it means that i need the connectionstring or somthing in the properties to change with the link click
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Jun 16, 2015
IÂ am trying to work with vertical datalist but it is always displaying the items horizontally even after writing DisplayDirection="Vertical"
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Feb 10, 2011
Is it possible to make asp:calendar control databindable to SQL database? Like GridView or ListView. I don't see how to do it and find it unbelievable. Or is there third party calendar control that is easy to use?
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Apr 5, 2010
I would like to use the accordion control to show different portions of an input form.I would like to use it to edit existing information. The code samples I have seenuse Eval data binding. Can I use the Bind method?
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Apr 20, 2010
I have a fairly simple form:
[code]....
However, once the update is finished (and I call e.Cancel = true), the LoginView control does not databind its children... so they are all blank. The FormView's viewstate is still fine, as all the rest of the controls outside of the LoginView appear fine. I even handle the FormView_DataBound event and a Trace shows that the FormView is being databound on postback.
Why then is the LoginView not keeping its ViewState/being databound? Here's a sample code snippet showing the flow:
[code]....
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Jul 20, 2010
How to create a user control for this kind of layout. I have a css. But dont know how to create a control for this kind of display. Title is the department name and below mentioned radio buttons are status for each department. Now department can be multiple as present in database. This one box can contain only two department list and new box needs to be created as soon as 2 departments are filled into this. How can I create user control for this type to bind it from datatable. I am reading about DynamicDataField but seems to be of no use. Here fields encircled is department and its statuses
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Jan 27, 2010
I've created a templated user control by following the example on the microsoft support pages. I won't post it all but the important part of the CS file looks as follows:
[Code]....
I'm not sure if the whole _CurrentDataItem business is required, I don't think so.The problem I've got, is that I've tried nesting it inside a FormView control so I can use it to display a record from a database. My ASPX looks like this:
[Code]....
Now, the bound properties (TitleText and TitleSubText) bind correctly, but the nested / template content is blank when the page loads. I'm not sure if this is something to do with the order in which everything is loaded or because I'm missing some code in the SimpleTemplate to get it to bind (etc.).
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Sep 8, 2012
  SqlCommand _cmd1 = new SqlCommand("Viewstate2", _cn);
_cmd1.CommandType = CommandType.StoredProcedure;
_cmd1.Parameters.AddWithValue("@behcode", data);
string data1 = Request.QueryString["id"].ToString();
_cmd1.Parameters.AddWithValue("@id", data1);
_cn.Open();
SqlDataReader _dr1 = _cmd1.ExecuteReader();
while (_dr1.Read())
{
lblprice.Text = _dr1["price"].ToString();
Lbldate.Text = System.Convert.ToDateTime(miladitoshamsi(Eval("Date"))).ToString(" yyyy/MM/dd");
In the above code I get the following error
Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control. Description: An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidOperationException: Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control.Source Error:Â
Line 97: lblprice1.Text = _dr1["price1"].ToString();
Line 98: lblprice.Text = _dr1["price"].ToString();
Line 99: Lbldate.Text = System.Convert.ToDateTime(miladitoshamsi(Eval("Date"))).ToString(" yyyy/MM/dd");
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Jun 4, 2010
i have an Gridview with BoundFiled, for the bound field headertext alo coming from the table, but i dont know how to bind the headertext and data. i have used below code
<asp:BoundField runat="server" DataField="column1_data" HeaderText = DataBinder.Eval '<%# Bind("column1_text") %>'/>
but getting error as "The BoundField control with a two-way databinding to field column1_text must have an ID."
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Aug 4, 2010
I have a asp:repeater control which I am using to display a photo and the Name. So for this I have to execute SQL query and unfortunately I dont have the control of the database - table design. So the photo comes from one table and the Name comes from another table. I wrote 2 sql queries to get both these information created 2 sqldatareader. So now I have to bind the repeater control to both of these reader. But I know it does not work. Is there any other way I can do this? I even tried to nest a repeater control inside another. But that does not work anyway.
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May 3, 2010
I have a strange problem. I have made a PagedRepeater control, which inherits from the Repeater, from a tutorial I saw here: http://www.4guysfromrolla.com/articles/020905-1.aspx. It's in VB and I'm in C#, and it didn't quite have all the features I was lookingfor, so, I've modified it quite a bit. I added support for a SqlDataSource control, as well. The only problem is, that it always returns the first item from the SqlDataSource, even when the CurrentPageIndex on the PagedDataSource is set to a different value.
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Nov 8, 2010
I'm trying to implement an ASP.NET DataBoundControl that supports two-way databinding. Unfortunatelly I can't find any documentation on how to do this on the web and even Dino Esposito in his ASP.NET 2.0 Advanced Topics only handles one-way databinding (also the contact form on his blog isn't working). Can anyone provide me with documentation or samples on how to do this?
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