C# - Find A Control Or Page A Control Is Embedded In?
Jan 9, 2011
I've written a web user control which I want to be able to drop into the markup for either aspx pages or other web user controls.I need my user control to be able to easily and efficiently work out if its inside another user control or an aspx page. My initial idea is to do it recursively with checks on the Parent property - continue looking up the nesting hierarchy until I find either a web form or a user control - but I'm not sure this the best way of going about this.
I know Silverlight controls can be embedded in an ASP.NET page but is it possible to do the same for a WPF control? The reason I am asking is because we have Infragistics which has a datagrid that can be flipped to have the columns on the left with the rows of data going down vertically. This is only in their WPF package though and I am trying to figure out a way to plug this in to an ASP.NET page.
I'm trying to find a TextBox in the code-behind page, it's inside a nested master page and also then inside another control container (it's inside ctrlCheckoutShippingAddress also) .
I have a drop down list embedded in a menu panel in my master page. This ddl fetches it's list items from my SQL Server. They are:
1. Select a type --appended during page load
2. Green type -- fetched from SQL server via a datasource
3. Red type -- fetched from SQL server via a datasource
4. User Manual -- appended during page load
For the sake of simplicity my website has 4 pages. When the 'Select a type' list item is selected - the user should be taken to a general 'Introduction' page. When the 'Green type' - the user should be taken to a 'Green' page - and etc.
I have a text box that is intended for an Email address. I am using a Regular eExppression validation control to validate the email address. When I place the following lines of code in a blank web Form, the validator works properly.
However, when I use the validation control within a CreateUserWizard control, it does not seem to fire but other validation controls (Required and Custom validators) do fire, but not the regular expression validator above for validating the address. The following is my complete web page. The two controls above appear unchanged in the code below, they are simply embedded into the wizard control mentioned.
i have problem in using ajax control , till morning it everything was file , now when i add any new ajax control it shows the error Control canot be created because visual studio cannot find the control's type in the control assembly then if i press OK it says The operation could not be completed . invalid FORMATETC structure
and I want change it's color in behind code so I wrote:
(this.Master.FindControl("HyperLink1") as HtmlGenericControl).Style["color"] = "black";
but below error happen:
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:
Line 13: Line 14: (this.Master.FindControl("ADMenuMessage") as HtmlGenericControl).Style["background-image"] = Page.ResolveUrl("~/Image/ADactivmenu.png"); Line 15: (this.Master.FindControl("HyperLink1") as HtmlGenericControl).Style["color"] = "black"; Line 16: } Line 17: }
how I can change hyperlink textcolor in behind code?
I looked at your example URL....I have ScriptManager in masterpage how call ScriptManager from masterpage in editorPage.aspx if (Script Manager 1.IsInAsyncPostBack)
The code was working correctly until i used a master page.
R.aspx vb Code: Dim athUsr As New AuthenticateUser() athUsr.IsLogIn("~/Login.aspx") If (IsPostBack = False) Then Dim objcoll As UserRegistrationColl objcoll = UserRegistrationProvider.GetDynamic(Nothing, "UserId='" + SessionManager.UserId.ToString + "'", Nothing) [code]...
I am loading a control to a page dynamically with LoadControl("src to file"). In the usercontrol i have a validator and some other controls that i would like to access from my page. I canät get it to work, null pointer exception. Scenario is like this. I have a Edit.aspx page which loads the EditTemplate.ascx usercontroll. I would like to get information or find the controls in the EditTemplate from the Edit.aspx site. I have tried exposing the controls and validators as properties but how do i access them from my Edit.aspx?
Example code: Edit.aspx, the control is later added into a Control control = LoadControl("src to ascx"); TemplatePlaceHolder.Controls.Add(control); EditTemplate.ascx <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="CompanyImageFile" ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator> CodeBehind public partial class EditTemplate : System.Web.UI.UserControl, IEditTemplate { public RequiredFieldValidator Validator { get { return this.RequiredFieldValidator1; } set { this.RequiredFieldValidator1 = value; } }
From the Edit.aspx site i would like to check the validators isValid property. Isvalid is set in a Save method. The save button that saves the template is located in edit.aspx, so the post in done from that page. So the question is how to get a hold of the property from the usercontrol in the edit.aspx page, where and how should this be done?
I have a MasterPage with a Textbox and an imageButton, one this MasterPage im using a web.Sitemap and global.asax for navigation, its works fine.Im im one the page URL... i get this in the browser bc of the global.asax URL...So its works fine the navigation.My problen is that when i type ind a value in the textbox on the masterpage and click the imageButton its then PostBackUrl="~/imailtest.aspx" that page isent using the masterpage but its looking for the id for the textbox on the masterpage.
But every time i hit the imagebutton i get this error: HttpException was unhandled by user code.The file /ebbe/Butikken do not exsist.And it ref to the codeline ct=Me.Prev..... line.
So its PostBack me from the default.aspx (With masterpage) to the imailtest.aspx as it need to, i just cant get the vaule from the textbox id="newsletter" from the masterpage.bc. it cant find the page.My imailtest.aspx Code_Behind is:
Code: Partial Class imailtest Inherits System.Web.UI.Page Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
I have a method that needs to find the repeater control to add data. I try the code below, but keep getting an error "not set to an instance of an object."
I have an aspx web application in which 1 aspx page and 1 web user controls exist. I added 4 instances of the user control in aspx page. There is a remove button in user control which is used to remove the control from the aspx page. If I click on remove button of the user control, how can I find that which user control's remove button is clicked from the aspx page.
So all I want to do is simply find a user control I load based on a drop down selection. I have the user control added but now I'm trying to find the control so I can access a couple properties off of it and I can't find the control for the life of me. I'm actually doing all of this in the master page and there is no code in the default.aspx page itself.
MasterPage.aspx
[Code]....
MasterPage.cs
protected void goToSelectedPage(object sender, System.EventArgs e) { temp1 ct = this.Page.Master.LoadControl("temp1.ascx") as temp1; ct.ID = "TestMe"; this.UpdatePanel1.ContentTemplateContainer.Controls.Add(ct); } //This is where I CANNOT SEEM TO FIND THE CONTROL //////////////////////////////////////// protected void lnkSave_Click(object sender, System.EventArgs e) { UpdatePanel teest = this.FindControl("UpdatePanel1") as UpdatePanel; Control test2 = teest.ContentTemplateContainer.FindControl("ctl09") as Control; temp1 test3 = test2.FindControl("TestMe") as temp1; string maybe = test3.Col1TopTitle; }
Here I don't understand what it's telling me. for "par" I get "ctl09" and I have no idea how I am supposed to find this control. temp1.ascx.cs
I'm having trouble figuring out how to do the following:On every page (or every page I so desire), I'd like to put a common control widget (e.g. think - Search functionality that contains a textbox+button). What's the best way to do this, and who handles the submit button (assuming it is a submit button)?i.e. what does my ViewUserControl look like? Does it have a form? does it use jQuery onclick""? Does it post to the main View's action method, or can I redirect it to another Controller/Action
I have created an asp.net usercontrol that should list users in a number of applications. For that purpose, the control renders a repeater (foreach application) which in turn renders a gridview (with users for that application).
The control renders fine, except the fact that columns in the gridview are not sortable. Nothing happens (no postback) when clicking the headers. Apparently, no JavaScript is rendered to perform the postback when clicking the header.
