Web Forms :: DataBinding With Expression Builders?
Sep 22, 2010
I'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]....
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Nov 29, 2010
if i have a label control declared in page with text='<%# Eval("test") %>'
is it possible somehow to get this eval expression in codebehin for this label.
like string strBindExpression=... output should be test.
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Jun 16, 2010
Using an objectdatasource I would like to pass an entire DataItem to a function, within a databinding statement. I have found a way that works, but I don't like the look of it. ;-)
Lets say I have a class called "People", with two properties "firstName" and "lastName". I have an objectdatasource which returns a list of "People", and I use that to populate a Repeater.
I also have a function called "GetFullName", which takes a "People" object as it's parameter, and returns the lastname and firstname with a comma between them.
In the ItemTemplate of the repeater, I could do this:
<%# GetFullName(CType(Container, RepeaterItem).DataItem) %>
-but it looks like such a hack. (Doesn't it..? Maybe it's just me.)
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Mar 7, 2010
I'm just testing a simple databind expression with:
<div>
Now: <%# DateTime.Now.ToString()%>
</div>
According to MSDN:
[URL]
literal text <%# data-binding expression %>
should work.
When I compile, it's OK but I got a blank instead of Now DateTime.
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May 19, 2010
I have the following HTML with a databinding expression as shown below:
[Code]....
The 'title' tag's expression gets evaluated fine.
But not the one in 'href' attrib of the 'link' tag. The HTML source generated shows the literal text "..this.BaseURL.../..."
Any idea what could be happening?
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Apr 20, 2010
By default, links are created without the forward slash suffixed to the end. It is per our company standards to always have this trailing slash. Is it possible, via a configuration or whatever, to automatically have a forward slash whenever these methods are called?
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Aug 25, 2010
I write inline expression and binding expression in the server head section:
[Code]....
[Code]....
But both kinds of expression aren't parsed or executed except the ResovleUrl menthod. The html renders like this:
<head><link rel="stylesheet" type="text/css" href="<%= Request.ApplicationPath %>themes/style1.css" /><link rel="stylesheet" type="text/css" href="<%# Request.ApplicationPath %>themes/style2.css" />
<link rel="stylesheet" type="text/css" href="/themes/style3.css" />
<script type="text/javascript" src="/js/jwork.js"></script>
</head>
As I know, the inline expression in the attributes of server control can't be parsed but the binding expression should if we invoke the DataBind method. But the above case breaks the rule.
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Feb 16, 2010
I'm trying to use the validator to work on a email form to ensure that they enter a valid from email address. That part works. I also want to add to the expression the text that I pre-populate in the txtbox ("Enter your email address") so on postback, after sending the message, I can clear the fields and repopulate that box.
How do I add that wording to the current expression: w+([-+.']w+)*@w+([-.]w+)*.w+([-.]w+)*
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Feb 2, 2011
I am using Regular Expression validator for a text box. The below is working fine.It is not performing validation when I enter values like 0000..001.How can I modify validation expression? But it would allow values like 100,...5000 i.e zeros after a number.
<asp:RegularExpressionValidator ID="reg2" runat="server" ControlToValidate="rng2"
ValidationExpression="^[0-9]+" ErrorMessage="*Please Enter a Valid Number for Second Range."
ForeColor="Red" Font-Bold="True"></asp:RegularExpressionValidator>
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Dec 1, 2010
I need some help in regular expression.I am validating the textbox text when updating the records.When i click the update button,the first 5 letters should be equal to CM000 or cm000.How to validate this using regular expression in asp.net. does anyone know validationexpression for this.
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Sep 20, 2010
i have to check if an input string is valid based on the given regular expression.. this is the regular expression.
(a(bb+aaa+((ab)*bb+(aba)*aa)(a+b)*) + (b(aa+bbb+((ba)*aa+(bab)*bb)(a+b)*)
+ is an OR
* is a LOOP, it is optional, it may be done as many as a user wants.
i've tried many ways to solve the problem that my professor gave me but my knowledge isn't that enough to solve this problem..
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Oct 10, 2010
I 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?
3. Another concern I have is that there are on average about 7, 8 HTML-Server CONTROLS (I added id and Runat="server" to the regular html controls) in a wizard step. If I load up all 7 steps and each step has 8 controls then is that a lot of controls? Wouldn't that affect performance easily when there are a few more users access this web app? Maybe I shouldn't use Wizard for this then? I should just have 7 forms and each form would have Next and Prev buttons that takes users to whatever page they want?
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Apr 15, 2010
I'm new to asp.net. I have a page with formview to read, edit and insert data to sql server 2008. On the page there are textboxes, dropdownlists. The Dropdownlist1 is bound to a lookup table. I also have a pop-up page to add, delete and update data underlying table. The problem is after i insert a new record to the lookup table and close the pop-up page, rebind the dropdownlist on the parent page. I'm refreshing the page with window.opener.location.href ....
but i want only the refresh the dropdownlist on the parent page.
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Feb 1, 2010
In an ascx control, it's possible to expose properties - let's assume the property name is a string property with a get accessor called DataField. If the ascx control contains a bindable templated control like a FormView and the FormView has a template that uses the two-way databinding syntax, why can't you provide a reference to the property in the call to the Bind method? I see that using the Bind method in a databinding expression causes the page parser to generate a method that is something like the following:
public System.Collections.Specialized.IOrderedDictionary @__ExtractValues__control8(System.Web.UI.Control @__container)
In which, I see the following line:
@__table["Some_Field"] = TextBox1.Text;
Now, this method (@__ExtractValues__control8) is an instance member on the same generated class that defines our DataField property, but when page parser goes to compile the control, I receive the following error:A call to Bind was not well formatted. Please refer to documentation for the correct parameters to Bind. I assume from this that the page parser requires a string literal to be provided, but I don't understand why.
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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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May 7, 2010
I'm trying to represent and add/remove enrollment of individuals in the database to different programs using two list boxes.
1. Programs: list of programs
2. ActivePrograms: list of programs the individual is enrolled in
I know how to add/remove items from one list box to the other:
my problem is how to represent in the seconed box the list of programs the individual is already enrolled in and to bind it and reflect changes in the "tblPrograms" for each individual
In the SQL database I have two tables:
1. tblIndividuals: information about the individual (with unique ID number)
2. tblPrograms: list of programs with a column for the Indivuduals ID
I was thinking for the 'Programs' table to make the program columns a yes/no columns.
right now I just have the "Programs" listbox showing the list of programs from another table called "ProgramList"
Here is what I need:
The "ActivePrograms" list box to reflect the list of programs for each IndividualID from the "tblPrograms" table (the ones with the value "Yes") and the "Programs" List box to reflect all programs minus the ones the are already in the "ActivePrograms" list box
here is my code:
[Code]....
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Feb 26, 2010
I've got a class that implements IListSource and returns a generic List of ListItem objects (List<ListItem>). in this list one of the ListItems has the Selected attribute set to true.On the web page I have a standard asp:dropdownlist and I set it's datasource to the getList method of my class and databind it.The problem is that the databind seems to loose the selected Item and the first item in the generic list becomes selected.
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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 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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Mar 2, 2010
I need a multi-column page layout. All colums are side by side and same width. This is very easy with CSS. But real problem is, i need to fill these columns with cells. Every cell is a record from a dataset. So i need to fill a column from top cell to bottom cell thus need to fill the page from left column to right column. As you see below every cell may have different height, because every record may cover different area in a cell (string length). Datalist is eliminated beacuse it has table layout, every row in this table has same height.
A repeater can manage for one column but what about the other columns. Should i use 3 or 4 repeaters side by side and share the data somehow between them. But this time there is another problem after first page is finished, sequential pages must have the same multicolumn layout filled by cells as i mentioned above. I think i need multi columns nested repater with paging support.
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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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