Web Forms :: Use Databinding Option In Wizard?
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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Jan 6, 2010
have a dropdownlist (ddl2) which is dependent on the selected value of another dropdownlist (ddl1).I have set the appendatabounditems to "true" for ddl2 and have added a "Please Select" and a "Select All" options. The Options show in the list when the page first loads. When ddl1 is selected the page refreshes and ddl2 is populated, however the "Please Select" and "Select All" options have disappeared.
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Jun 29, 2010
I have a dynamic dropdown that is populated from sql. The user is supposed to select an option from the dropdown, then click a search button on the form to return some results based on that selection. It works fine if the dropdown gets populated with more than one record. However, if only one record is returned, that one record can't be selected. Whether you select it or just leave it alone since it's the only one, when you click the form button (search button), no results are returned b/c the dropdown selection must not be actually selected.
I've included the relevant code below. First the DDL, then the datasource, and finally the C# code in the if (!Page.IsPostBack)
[Code]....
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Jul 14, 2010
I am trying to use wizard in an update panel but the wizard is disappearing when I click for the next or prev step button. I only want to close wizard , when I click the finish button. How can I do this ?
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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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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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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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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%>
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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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Feb 18, 2010
I've created a web page that has a GridView control bound to an
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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 26, 2010
I have a forms view with an EditItemTemplate. I would like to populate the EditItemTemplate using the code behind vs. mixing the data in the UI as so:
text='<%#Bind("Question") %>'
At what point do I do this? I thought it would be on FormView_DataBinding, but there is no e.item.dataitem like other databound controls. My issue is that I need to check criteria of the data prior so I know which inputs to make visible, to set properties of controls within the EditItemTemplate, and manipulate the data prior to binding (less of an issue as I can always just tweak the data prior to binding, but it doesn't solve my other problems).
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Aug 12, 2010
I am using the following to show a Yes/No for a boolean in my database:
[Code]....
I want to do something similar with a drop down list but I am having problems making the current value the selected value in the dropdownlist:
[Code]....
I am getting the error:
Databinding expressions are only supported on objects that have a DataBinding event.
System.Web.UI.WebControls.ListItem does not have a DataBinding event.
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Apr 8, 2010
I am having issues with databinding a textbox within a tab within a gridview. The textbox displays the data information properly; however when I try to edit a row in my gridview anything I type within that textbox is not saved in the database. Also my other fields for my gridview are editable, I am only having issues with this textbox within a tab. Here is the code:
[Code]....
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Sep 20, 2010
I have a custom DataControlField class that works fine but when I try to use <%# Eval('???') %> with it I get an error."Databinding expressions are only supported on objects that have a DataBinding event. SharedG.ImageLinkButtonField does not have a DataBinding event."I can't get this to work,the DataControlField dosen't seem to have a DataBinding event to override or anything.I could use a normal templatefield itemtemplate etc.with eval but I don't want to rewrite this all the time.
[Code]....
want to use it:
[Code]....
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