Web Forms :: Modifying One Controls Object From Another Control?
Mar 17, 2010
I have two user controls (wishlist & shopping cart) The shopping cart & wishlist objects are both in sessions.Also both controls are sitting inside the masterpage and the wishlist has the ability to move an item to the shopping cart. Now how do i achieve this? Originally i thought i would expose a public method within shopping cart called "BindItems" which would rebind the datacontrol, however this is causing .NET's automatic postback validation to throw an exception.
Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.I dont want to set EnableEventValidation to false either for security reasons.
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Mar 31, 2010
I know how to deploy and retrieve a single element in LINQ, but how can I do to change all the properties in a list. In the line below, I can only modify a record, I would modify several.
_ListaAcaoMenuInfo.Where(p => p.Id_acao == id).FirstOrDefault().Id_menu = 0;
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Apr 21, 2010
can you please help me to brainstorm the possible causes of this error. I've got a paged repeater with localisation bound programitcally to an sqldatasource using a stored proc. I can post code if needs be but it's rather long. I'm looking for typical causes of this error + will make note for future reference!
erver Error in '/WebSite4' Application.
Object reference not set to an instance of an object.
Description:
An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
[Code]....
Line 233:Line 234: Repeater1.DataSource = PagedResultsLine 235: Repeater1.DataBind()Line 236: doPaging()Line 237: End Sub
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Sep 24, 2010
[Code]....
I am getting error of in Foreach loop
[Code]....
How to resolve this situation or any other alternative to cum out of this problem.
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Dec 3, 2010
I am using a third party control for my web page. I do not have the source code to the DLL. I need to make a very small change the html that the control generates. Is there a way to capture the html generated by the control, and then render the control with that small change.I can override the render method of the parent control, is there a way in that method to find out the html that the control generates in there and render it with the small change?
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Jan 8, 2010
I would like to use the gridview paging feature and have built a gridview with a user control. The data source has lots of columns, so to make it easier I want to return a LIST<MyObject> and just pass <Myobject> into the user control rather than all the data elements. Not sure how I access the object of the data source to bind to the control. Assume it would be during ondatarowbound.
Also, my guess is there is a better way to do this than gridview. I'd take either solution that allows me to have easy paging and pass the complete object into the user control
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Oct 5, 2010
i have a Rad Upload control to upload more than one image ,,the problem is i want each image to have a caption (inserted by the user as a text)during the uploading operation,,so what i wanna to do is modifying the Rad Upload control and adding a text box in it and access the data in this text box .. how to do this?
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Jan 7, 2013
I have an asp:repeater control on a form. It contains 4 columns. Based on a certain value as a result of a database read, the 4th column, needs to contain a button control else it will contain plain text. How do I this in the code-behind using VB.Net? The code that I have is below but it's not working. I've never worked with a repeater control before.
Code:
<asp:repeater id="dlAppeal" runat="server">
<HeaderTemplate>
<tr id="AppealHeader" runat="server">
<td class="tableHeaderNw" align="center" width="11%">Date</td>
<td class="tableHeaderNw" align="center" width="16%">Type</td>
<td class="tableHeaderNw" align="center" width="53%">Description</td>
<td class="tableHeaderNw" align="center" width="20%">Appellant</td>
[code]....
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Aug 11, 2010
I have a CreateUserWizard control to be able to allow an anonymous user to create an account. Provided that all entered information is correct that the user enters, a new account is created for him/her. But also, when this user is created, I want to [b]also[/b] add the username to another table in my ASPNETDB database. How exactly can I "tap" into the event that creates a user and adds it to the appropriate tables (aspnet_Users, Members, etc.) and make it add the username to yet another table?
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Dec 31, 2010
I have a a dropdown on a page
<asp:DropDownList ID="drpName" AutoPostBack="true" AppendDataBoundItems="true" runat="server" ></asp:DropDownList>
and I on occasion want to add items to it using javascript/jquery.
When I select the items that have been added and it does a postback I get the following error:
Invalid postback or callback argument. Event validation is enabled using in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
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Apr 19, 2010
In the same Code behind file I have:
// This works
Label lblTopNavBarInfo = (Label)Master.FindControl("lblTopNavBarInfo");
lblTopNavBarInfo.Text = "Currently Serving: + FirstName + " " + LastName ;
// This compiles but throws an error in the browser
LinkButton lnkBtnProductsOwned = (LinkButton)LeftNav_CustServ1.FindControl("ProductsOwned"); // The Control is visible
lnkBtnProductsOwned.Enabled = false; // Error: Object reference not set to an instance of an object.
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Sep 15, 2010
I have a webform named Default.aspx and in it an iFrame...
The iFrame will load one of a few different pages/forms/aspx... (for this example lets just say its test.aspx)
On test.aspx I have 2 buttons Button1 and Button2 If I have code in my test.aspx.vb for Button1 click of:
button2.text = "hello world"
it looks as if it reloads test.aspx inside the iFrame and sure enough Button2 states "hello world"
So now lets say on the Default.aspx I also have a button and its named Button5.
How would I go about updating the Button5.Text from with in the vb code of Button1 click/vb code located on Test.aspx
I have looked over some other post [URL] and the tell of using "PreviousPage" but that not seam to be what I need, I want to be able to state the page/form I want to effect a control on it...
I know how to do this in jut standard VB.net (not web) its like:
FromName.ControleName.Text = "Hello World" but then again in VB.net windows apps you dont have Iframse to deal with...
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Jan 23, 2010
If I have a ListView with an itemtemplate like so:
<td> <label> </label> </td>
How can I get a column in the listview and change its properties?
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May 19, 2010
Here is a snapshot of my gridview with selection enabled. How can I modify this, so instead of having an extra row that says select, I could have the order numbers be selected (hence the order numbers would all be underlined)
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Jun 10, 2010
I have a very simple sub routine which I call from RowDataBind that adds a sort arrow image to the cell if a SortExpression exists. It works great except for the problem that if the gridview renders a wide table, the header text wraps and the image appears on a different line to the text. Therefore, I need to modify my subroutine so that if the header text is only one word in length, then a white-space:nowrap rule is placed on the header cell of that column.Sound really easy, but I just cannot get it to work. For some reason the white-space:nowrap rule is being added to EVERY header cell, regardless of the text inside it.
[Code]....
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Jan 31, 2011
I have a gridview of the following form below
ID Expirydate
A 1/02/2011
B 2/02/2009
C 3/01/2009
and I would like to modify my sort expression so that when the expirydate header is clicked on, it will make all those id that has expired pop to the top . In this case, we will have the following as the results
ID Expirydate
B 2/02/2009
C 3/01/2009
A 1/02/2011
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Dec 3, 2010
I have a Data list, inside that i have a repeater, inside the repeater i have a panel.hat i want to do is reference my panel (Panel1) so that i can change the visible properties when a link button is clicked. However as this is inside a dynamic control i am a bit lost in how to reference it! This is my code
[Code]....
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Nov 25, 2010
I got this error "object reference not set to an instance of an object" when i want to display the values of dynamic generated drop down lists by pressing a button to show the values in Listitem.
i have master page in which i use :
1)ScriptManger
2)UpdatePanel
3) treeview menu
Server side Code is:
[code]
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Apr 16, 2010
I have a user control inside a repeater. I am binding a collection of objects to the repeater.
My user control has a public property to retrieve the object (setobject)
How do i pass each object through to the user control and not just the object property value? What is the syntax to do this?
[code]....
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Jun 30, 2010
I have a gridview inside a user control bind to an object datasource. Now I want to bind the object datasource with a parameter from parent page.
For this purpose I defined a public property in user control but how do I pass it with object datasource ?
I am calling from parent page like
myusercontrol.parameter=querystring["id"];
How to bind object datasource with my parameter ?
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Nov 23, 2010
I have created an ASP page to display records for auditor review and response. The page consists of two repeaters that display 5 rows from a database at a time. for each row displayed, a RadioButtonList, containing two buttons is attached. If the second button is selected, an input text box is displayed to allow auditor comments.
My situation is that I cannot find a way to identify which row is being selected? When I select the Button that should enable the text box, I'm receiving the following error:
"Object reference not set to an instance of an object"
I'm just starting out in ASP coding and would like to know what I'm not doing right?
[code]...
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Aug 11, 2010
Usage :
[code]...
The problem is it gives me following error :
Object reference not set to an instance of an object.
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.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
Line 21: {
Line 22: base.OnInit(e);
Line 23: _ContentTemplate.InstantiateIn(BodyControlSpace);
Line 24: }
Line 25:
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Mar 14, 2010
i am developing a sharepoint webpart. In this webpart i need to use a repeater control. The problem is, i can only use codebehind for creating and using the control. So i have some questions:
1. After creating the repeater control in codebehind, how to create some templates (itemtemplate, footertemplate, etc.) and use it?
2. How to bind a object collection to a repeater control?
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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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Jan 19, 2011
_objbefor = Convertor.XmlDesrialize.XmlDesrializer.DesrializeAnyObject(_XmlObjBefor, _ObjectType);
_objAfter = Convertor.XmlDesrialize.XmlDesrializer.DesrializeAnyObject(_XmlObjAfter, _ObjectType);
//exteract properties of loged object
PropertyInfo[] _PropertyInfo = _ObjectType.GetProperties();
List<string> _ObjBeforTostring = new List<string>();
//_ObjBeforTostring.Add("");
_ObjBeforTostring.Add("*************Befor Object**********");
_ObjBeforTostring.Add("");
foreach (PropertyInfo pf in _PropertyInfo)
{
if (_objbefor != null)
{
string _str = pf.GetValue(_objbefor, null).ToString();
_ObjBeforTostring.Add(pf.Name.ToString() + " :: ( " + _str + " )");
_ObjBeforTostring.Add("==============================");
}
}
_ObjBeforTostring.Add("");
_ObjBeforTostring.Add("*************After Object**********");
_ObjBeforTostring.Add("");
foreach (PropertyInfo pf in _PropertyInfo)
{
if (_objAfter != null)
{
string _str = pf.GetValue(_objAfter, null).ToString();
_ObjBeforTostring.Add(pf.Name.ToString() + " :: ( " + _str+" )");
_ObjBeforTostring.Add("==============================");
}
}
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