Web Forms :: How To Use Findcontrol In C#

Mar 24, 2010

I have the below linqdatasource selecting event to populate my frontend asp.net listview. How do I find a control within my listview's ItemTemplate within this event? My attempted code returns the error: "Object reference not set to an instance of an object" on code line 80? From the debugger I know that "query.UserId;" returns a value so it's my "ratingControl" reference that the debugger can't find?...

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Web Forms :: Inconsistent FindControl?

Mar 29, 2010

TextBox otb = (TextBox)Page.Master.FindControl("txtStatus");
otb.Text = "Test Script 1 saved";
otb.Visible = true;

I have a textbox that serves as a status panel (box) on the masterpage. I use the same code on two different content pages. On one content page, the write occurs. On another content page, the write does not occur. I even moved the code that was working into position on the erring page and it still doesn't write.

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Web Forms :: How To Modify Hyperlink Using FindControl

Apr 15, 2010

I have a literal control on a page that gets it's value from a resource file like this...

<asp:Literal ID="Literal2" runat="server" meta:resourcekey="Literal2Resource1"></asp:Literal>

The resource file contains the following HTML code...

<a runat=server id="bylchau" href="./pothole_locator_map.aspx?lang=en-gb&lat=53.153977&lng=-3.533306">Bylchau</a>

Therefore when the page is loaded it renders a hyperlink to the page.

What I want to do, is modify the href of this hyperlink after the page has loaded (in Page_LoadComplete??)

Have tried the following but get error, 'Object reference not set to an instance of an object.'

Dim quicklink As HtmlAnchor = DirectCast(Form.FindControl("bylchau"), HtmlAnchor) quicklink.HRef = quicklink.HRef + "boo"

What I was hoping for is that the href of the anchor would change to href="./pothole_locator_map.aspx?lang=en-gb&lat=53.153977&lng=-3.533306boo"

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Web Forms :: Cannot Find Control ID Using FindControl

Feb 3, 2011

I got problem finding the Control ID in my ASP.NET page.

When I try to refer that ID, it always give me:

I am trying to refer this:

[Code]....

I pass this id from here:

[Code]....

This is my code behind which is driving me crazy :(

[Code]....

When I use label to display the STRING INTIME, IT GIVES ME "textboxCashier1In"

BUT WHEN I DO THIS:

[Code]....

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Web Forms :: Findcontrol With A Third Party Control?

Aug 10, 2010

How do we code "findcontrol" with a third party control? I tried "TextBox" for Namespace="FreeTextBoxControls" Assembly="FreeTextBox" and it threw an error:

Object reference not set to an instance of an object.

Here is the offending line:

Dim Body As String = Convert.ToString(CType(lsvBlocks.InsertItem.FindControl("FreeTextBox"), TextBox).Text)

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Web Forms :: FindControl Method With MasterPage?

Dec 14, 2010

If I use the FindControl Method on an .aspx page (without master page), it finds the desired control no problem. When I use a Master Page then it will not find it even though it exists. why is this?

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Web Forms :: FindControl SelectedItem In Dynamic DropDownList

Jun 5, 2010

First post here, I usually try not posting until I am completely lost. I have a webform that gets a dynamic dropdownlist added to a placeholder in a method during pageload. During a submit of the page, I want to be able to get the selectedItem in the DropDownList that was also added dynamically from a DB. I know the ID of the DropDownList, and I know the Value of all the ListItems. Although when I am trying to use FindConrol(ID), and assign it to a DropDownList, the Control comes back Null and I get an error saying "Object Reference not set to and Instance of an Object", I believe because its not finding the control.

[Code]....

Can anyone show me how to use this to get access to the properties of the dynamic DropDownList properties, especially the ListItems within.

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Web Forms :: Datalist Findcontrol Returns Null?

Mar 1, 2010

I have a datalist with price label

<asp:label runat="server" ID="lblPrice" Font-Bold="true" Font-Size="Medium"> <%# DataBinder.Eval(Container.DataItem, "dProduct_price") %></asp:label>

i have used to find the control in my code but when i debug the value is null

Label price = (Label)e.Item.FindControl("lblPrice");

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Web Forms :: FindControl Does Not Working For Menu Childitems

Feb 1, 2011

I want to access child menuitem by name.not index number is it possible? This doesn't working
Menu menuLogin = (Menu)(LoginView1.FindControl("mLogin"));
MenuItem mi = menuLogin.FindItem("Register");
mi.text="Null Reference Exception here";

But this works:
Menu menuLogin = (Menu)(LoginView1.FindControl("mLogin"));
MenuItemCollection mic = menuLogin.Items[0].ChildItems;
MenuItem mi = mic[0]; mi.text="its OK";

I am looking something like this:
MenuItemCollection mic = menuLogin.Items[0].ChildItems;
MenuItem mi = mic["Register"];//or mic.finditem("Register") or so...
mi.text="its OK";

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Forms Data Controls :: How To FindControl In Gridview

May 7, 2010

I have a dynamic gridview in which i need to add textbox, checkbox, imgButton in the cell dynamically.

At the moment user click on the imbgutton, a click event fire and i need to capture the user input on the checkbox and textbox of the particular cell.

I have problem in finding out the checkbox and textbox control in the imgbutton click event. The cause is i do not know which row in the gridview i need to search to for the control.

I have try gridview.Fincontrol but fail.

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Forms Data Controls :: How To Use The GridView FindControl

Jan 6, 2010

using the GridView FindControl.

What I've done is I've setup a Gridview with a datasource to show only 1 of the columns I need from the datasource, but I also have another ItemTemplate Column in which I have a dropdownlist with another datasource that I've bound to the dropdownlist.

What I need to do is have the dropdownlist show the selected one when compared to a id from datasource in the gridview.

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Forms Data Controls :: How To Using Findcontrol In Gridview

Mar 11, 2010

i have button field in grid view, basicly i want to show to in some of the row only, but i cant find the "ID" using find control

This is my aspx code

[code]....

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Forms Data Controls :: How To Use Findcontrol In A Repeater

Jan 10, 2011

I have a aspx. site with a repeater and a HeaderTemp. in this i have this code.

[Code]....

my question is how do i in VB use the findcontrol from the aspx.vb (codebehind) so i can use the selected value in a if-then-else.

[Code]....

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Web Forms :: Loading ImageButtons Dynamically Using FindControl?

Sep 22, 2010

I have a table where each cell contains an ImageButton, with an iterative ID:

[Code]....

I am then trying to assign a URL to each imagebutton dynamically in a separate code file

[Code]....

Everything compiles, but when I run this I throw a Null Reference Exception: {"Object reference not set to an instance of an object."}

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Web Forms :: Access A Template Field With Findcontrol?

Feb 28, 2010

I have this control in my paqe:

<asp:TemplateField HeaderText="Reciprocal URL" SortExpression="ReciprocalURL" ItemStyle-Width="">
<ItemTemplate >
<a href="<%#Container.DataItem("ReciprocalURL")%>" target="_blank" title='<%#Container.DataItem("ReciprocalURL")%>'>
<%#BusinessLogic.WebSite.BreakReciprocalURL(Container.DataItem("AdvLinkID"), 40)%>
</a>
</ItemTemplate>
</asp:TemplateField>

I have a select all function and I want to use an if statement to only select items if there is something in this templatefield:

Protected Sub chkSelectAll_CheckedChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles chkSelectAll.CheckedChanged
For Each itm As GridViewRow In Me.gvLink.Rows

'insert if statement here to check for linkback url. if so then enable checkbox else disble checkbox to prevent user from selecting.

CType(itm.FindControl("chkSelect"), CheckBox).Checked = CType(sender, CheckBox).Checked
Next
Me.lblMsg.Text = ""
End Sub

I would do something like the above for the checkbox, but I'm not sure how to reference the control. It's a templatefield right?

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Forms Data Controls :: FindControl In Gridview_RowCommand?

Mar 22, 2010

In my gridview, I have an ImageButton and when the user clicks it, I show a modal, however, when I popUp modal its showing me the same Datakey value for each row, so, is there a way to use FindControl for the selected row within the RowCommand?

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Web Forms :: Master.FindControl Removes UserControl?

May 19, 2010

I face this weird problem when I was trying to add multilanguage support to my website.The main login page contains user control and I am also using Master page. I added a linkbutton to master page so I can switch to other language from any page. So, whenever I want to switch langauage, I check this linkbutton text value. so I use this code

LinkButton lb = (LinkButton)Master.FindControl("languageLinkButton");

(Note: this code written inside protected override void InitializeCulture() in mainpagelogin.aspx)move the above line everything run normally.

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Forms Data Controls :: FindControl To String?

Feb 9, 2011

this is probably very simple but I'm tearing my hair out!I'm using the FindControl method to try and grab the text in a textbox inside a DetailsView Template Field and display it on a label. Here is my code:

[Code]....

The word text has a squiggle underneath though and it causes an error as "System.Web.UI.Control' does not contain a definition for 'Text' and no extension method 'Text' accepting a first argument of type 'System.Web.UI.Control' could be found (are you missing a using directive or an assembly reference?)". I know the problem is that I'm treating this Control as a TextBox when it isn't, it's a Control. So how do I get from Control to TextBox so I can take the String and use it in code?

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Web Forms :: Getting Object Reference Not Set - Using FindControl For IFrame?

Jan 21, 2011

I cannot get this piece of code to work (vb 2005). Whatever I try I'm getting errorSystem.NullReferenceException: Object reference not set to an instance of an object.

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Forms Data Controls :: Assigning Value Using FindControl?

Jul 23, 2010

I thought I had this all figured out, in fact the following is similar to another page I have that works, but dinged if I can see what is wrong with this.I have a FormView with the InsertItem Template as the default. I have a label "UserId" that is assigned the logged on user's userid on page load with:

LblUserID.Text = Membership.GetUser.ProviderUserKey.ToString , which I am certain works.

There is a textbox "User_IDTextbox" within the InsertItem Template of a FormView, and I am trying to write the UserID into that text box using this VB code in a subroutine:

Dim TxtBxUserIDParent As TextBox = DirectCast(FVAddTradeResort.FindControl("User_IDTextbox"), TextBox)
TxtBxUserIDParent.Text = LblUserID.Text

This does not result in populating the textbox within the InsertItem Template of the Formview template with the UserID

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Web Forms :: How To Access A DropdownList Inside A TabPanel Using FindControl

Aug 30, 2010

I need to use FindControl to access a Dropdownlist in my webpage, however the control resides inside many panels like below:

ContentPlaceHolder -> UpdatePanel -> Panel -> TabContainer -> TabPanel -> Table -> TableRow

will I have to use FindControl recursively inorder to read the dropdownlist.

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Web Forms :: Getting Dynamically Generated Controls By Id With FindControl Function?

Mar 18, 2010

I'm trying to get dynamically generated control by id with FindControl function, but it doesn't return it

here's short version of code when I generate controls, it is basically in a loop to have number of CheckBoxes depending on inputs

[Code]....

[Code]....

[Code]....

[Code]....

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Forms Data Controls :: Findcontrol Not Finding Checkboxes?

Aug 4, 2010

I have a usercontrol include file that has a panel on which I have programatically added checkboxes that equate to the results of a selection via a sql select stmt.

I am now trying to find the results of the checkboxes (ie checked/unchecked) using findcontrol as per

[Code]....

the commented out code is a different attempt

Is this the correct method(s) or should I do something different

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Forms Data Controls :: FindControl In Formview Not Working

Apr 17, 2010

Can Someone explain why this doesn't work here, when it works in another formview?
[Code]....
I Get Object Reference Not Set, but its all there. I see no reason why it shouldn't work. Same error happens if i remove the first if statement and leave the second it Gives an error on LocationAddButton.Visible = false;

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Forms Data Controls :: How To FindControl In DataGrid ItemCommand

Nov 11, 2010

How do I disable the DataGrid controls in ItemCommand using VB.For Example I have dropdownlist bound in my DataGrid. Now I want to Disable this control in Datagrid_ItemCommand.I tried like this

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