Add Controls To A Collection And Update From Collection?
Mar 25, 2011
I have an ASP.NET app with lots of textboxes all over the page that need updating at various points through program execution.
These textboxes actually belong to a certain class, so for easy updating I thought I could create a Dictionary(Of string, object) and add the control.ID and the control to it and then for updating do something like this:
(in case of updating textbox.text):
[code]....
However the text property of the textbox does not actually get updated. I'm mainly trying to avoid having to manually do textbox.text = somestring for each one of my textboxes every time I have to update them.
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Jul 26, 2010
I have a list of objects that I want to bind to a gridview. Creating that list and binding it works fine for most of the public properties in that list.
There are some objects contained in each of those objects... for instance there is an Address object.
object.Address.Line1;
object.Address.Line2;
When I bind this to my gridview, I have no issues with stuff like object.DateRegistered, but how can I access things like object.Address.WhatEverProperty? I always get this error:
"A field or property with the name 'xxx.xxxx' was not found on the selected data source."
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Mar 31, 2010
I want to know that how i use the collection class for storing some data and save it letter in the data base.
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Apr 1, 2011
I know that if I have set a cookie on a previous request, it will show up in my Request.Cookies collection. I want to update my existing Cookie. Are the cookies from my Request.Cookies collection already copied to my Response.Cookies collection? Do I need to add a new cookie with the same key using Response.Cookies.Add(), or do I need to use Response.Cookies.Set()?
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Sep 14, 2010
I have been trying to design a form, which uses a view model that contains an object array. I want to set up this form so that when the submit button is clicked, all the members of the array are updated. Here is my code:
The class definition of the array element:
[Code]....
The problem is that when I clicked the submit button, none of the luSubject objects in the array Subjects got updated. But if I set up some initial values for the members of the luSubject objects, for instance, set the Name field to be "Maths" in the constructor of luSubject class, then it got displayed on the text box when the form page was loaded. This suggests that this form could display the data in the array, but cannot update it.
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Jul 28, 2010
is there a way to update a column for all rows in a collection using linq like sql does it
eg. UPDATE myTable SET myColumn='newValue'
Also weighing options as to whether there is better performance using linq to sql for this or straight sql to DB via table adapters etc.
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Feb 25, 2011
This is part of a larger problem which has plagued me for a while now (see "EntityCollection already initialized" error with entity as model in Asp.Net MVC? for the entire picture).
But I found a web site with someone who had faced a similar problem and apparently solved it for his needs [URL]. I tried it, but had to make some modifications to fit my code, and the helper methods supplied by a tutorial by Steven Sanderson (see previous post).
I'm very close it seems, but not quite:
UpdateModel(consultant, "Consultant");
if (vm.Programs != null) //Unnecessary? Can it even be null if it's initialized from the model?
for (int i = 0; i < vm.Programs.Count; i++)
{
Program formProgram = vm.Programs[i];
Program modelProgram = consultant.Programs.SingleOrDefault(x => x.Id == formProgram.Id);
if (modelProgram == null)
_repository.AddProgram(formProgram);
else
modelProgram = formProgram;
UpdateModel(modelProgram); //Doesn't work. The modelProgram object does get updated with the correct property values, but it isn't saved to the repository...
}
_repository.Save();
Although this follows the example on the site above, and the modelProgram does get updated with the changed properties, these values are not saved to the database on _repository.Save() on the Consultant object, even though the modelProgram object is a reference to a Program object on the Consultant... What am I doing wrong?
I am using the Entity Framework by the way, if it isn't clear.
(BTW, if anyone has any input on the previous question and the whole picture, that would be welcome too, it is still unresolved).
UPDATE: There was apparently a mistake in here: UpdateModel didn't actually do any updating, I had just referenced a different object (the one in the viewmodel) for the modelProgram, so of course it had the right property values. I still want ideas for how to achieve this though...
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Jun 20, 2010
I'm using HttpModule to capture requests to the web server. Before processing the page I'd like to check the values contained in some keys of the Request.Form collection and according to some logic change if necessary. I'd like to do this when BeginRequest event is fired. The problem is that the Request.Form collection is readonly.
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May 7, 2015
I am using
public int deleteProduct(int ProductID, int rowid) {
// Create the Database object, using the default database service. The
// default database service is determined through configuration.
Database db = DatabaseFactory.CreateDatabase();
DataSet productsDataSet = new DataSet();
[Code] ....
The above code am using but throwing below error how to resolve
"Update requires a valid UpdateCommand when passed DataRow collection with modified rows."
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Feb 1, 2011
List<Dictionary <string,object>> I am reading about the list and collection, If possible, what are the different ways that I can utilize the list of dictionary collections..... gives me different examples or areas where I can use it.
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Feb 7, 2011
I am getting the following error
The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).
on adding the following code
HtmlGenericControl ctrl = new HtmlGenericControl("NOSCRIPT");
ctrl.InnerHtml = string.Format("<meta http-equiv=REFRESH content=0;URL={0}>", targeturl);
Page.Header.Controls.Add(ctrl);
May be the below script has some problem
<script type="text/javascript" >
function myfunc()
{
var pas,simve,saue,tsh;
pas=document.getElementById('<%=TextBox2.ClientID%>').value;
simve=hex_md5(pas);
saue='<%=Session["saltval"]%>';
var stsh=simve+saue;
tsh=hex_md5(stsh);
document.getElementById('<%=TextBox2.ClientID%>').value=tsh;
}
</script>
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Jul 22, 2010
here is the requirement:
i have a lable a textbox, and two buttons(+ and - button) on my asp.net page.
so when i click on the plus button it should add the the whole collection of controls to the page(i.e. lable, textbox and two buttons). And when i click on minus button it should remove the collection.
This should go on.meaning whenever i click on any plus button the control collection should get added to the page.
I am wondering what will be the best approach to do it.
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Jan 21, 2010
I require to get the "CostPrice" value out of the sqldatasource parameter
so i may use later in my code?
i cant use the Amount value inserted because i have 4 statements in a conditional If Block and i want to get the selected statement.
InvoicesDataSource.InsertParameters("CostPrice").DefaultValue
= Amount
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Jan 26, 2010
Im getting error after i rewrite my url,earlier my code was woking fine but as i rewrite my url im getting error.
The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).
In App_code i have used class file consists--
public class FormRewriterControlAdapter : ControlAdapter
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Jan 23, 2010
I am getting this error after I add <head runat="server"> The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).
[Code]....
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Mar 31, 2011
I need a function to be performed on the page load, which uses a stored session variable. I have added the following to my <body> tag.
<body onload="doSomething(event,'<%= Session("StartTime") %>')>
This does work. However, it is causing a problem elsewhere, when I try to add a control to my controls collection:
dim myPanel= New Panel
...
Me.Controls.Add(myPanel)
giving the following error:
"The Controls collection cannot be
modified because the control contains
code blocks (i.e. <% ... %>). "
I've tried the suggestion of using <%#...%> instead of <%=...%>, but this prevents the session variable being found- it is just blank.
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Jul 21, 2010
I'm not for sure how the ControlCollection of ASP.Net works, so maybe someone can shed some light on this for me. I recently discovered the magic that is extension methods and Linq. Well, I was very sad to find that this isn't valid syntax
var c=Controls.Where(x => x.ID=="Some ID").SingleOrDefault();
However from what I can tell, Controls does implement the IEnumerable interface which provides such methods, so what gives? Why doesn't that just work? I have found a decent work around for this issue at least:
var list = (IEnumerable<Control>)Controls;
var this_item = list.Where(x => x.ID == "Some ID").SingleOrDefault();
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Mar 27, 2011
i saw few of solutions for this exception (like putting it in place holder, or replace the <% to <# ...etc) , but i don't get the idea about it, i mean what is the controls collection? and why it can't be modified if the added control contains code blocks?
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Feb 24, 2010
I have an ASP page with the following repeater:
[code]....
Why is the collection empty, when there are controls drawn on the screen?
(BTW: I tried adding/removing the EnableViewState="true" tag)
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Jul 12, 2010
Equivalent of recordset.Edit, Movefirst,NoMatch of vb6 in vb.Net? I want to fetch records from single table of database(Sql server 2005) and collect in collections. How can we do that by dataset and dataadapter ? We want to fetch not to display.
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Aug 11, 2010
I recently put some code <% %> code blocks in my Master Page. Note I've read of the "fix" for either moving things out of <head> or using <%# %> but neither of them work well for my application.
Now the weird thing is that I only get this error on one page of mine. All the other pages seem to work fine, so what actually causes this error? There is nothing I can think of that is unique about this page. It uses the script manager as does other working pages and there is just nothing extraordinary about this page. It does have quite a few custom controls on it, so hunting down what is different in this page is more difficult than usual.
So what actually causes the Controls collection cannot be modified because the control contains code blocks exception?
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Jan 31, 2011
I have a custom object and a generic collection of this object.When databinding, how can you get a reference to the object's collection similar to how DataRow.Table works? I understand I may need to write code to handle this but I'm not sure where to start.I considered adding a property to my custom object class to store the collection in, but would this generate too much overhead setting this for every object in the collection?
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Apr 13, 2010
I've been pulling my hair out over this one... I've searched on the net and even in the forums, but can't seem to come up with an answer for a simple question.I tried the following code inside my html to get the selected value that comes from our database into the grid and it doesn't work. I am positive that a value exists for the itemType. It is 1. Instead of Checked, I tried SelectedItem and SelectedIndex. Neither of those worked.
<code>
Checked='<%# DataBinder.Eval(Container.DataItem, "itemType")%>'
</code>
I erased the above code from my grid and inside the ItemDataBound event, I placed the following code, but don't know what other code I should place next after it. I know the value inside "itemType" is 1 by debugging it.
<code>
RadioButtonList itmtype = e.Item.FindControl("rblItemType") as RadioButtonList;
</code>
How can I simply find the selecteditem in the list coming back from the database inside the itemdatabound event?
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Nov 18, 2010
I have a MyLinkButton : LinkButton.
In any event I override I don't have any attributes in my "base.Attributes or this.Attributes" collection. How's that possible? The rendered output clearly shows an id and an href attribute.
I'm trying to get rid of the href part and put in my own. Unfortunately Attributes.Remove("href") won't work.. because there's no such attribute. Or any attribute for that matter.
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Mar 9, 2010
i have a listview control with two textboxes in each row. i am to fill those and save their values in one/more than one database tables using a stored procedure.
i currently create a comma-separated string (using a string builder) of all the values, and then pass it as a parameter to the SP.
in the SP i extract the values, and put them into my tables.
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