Forms Data Controls :: Failed To FindControl On Webpage?
Sep 30, 2010
I got a content place holder, in this holder, I have a grid view. Inside this grid view, I will have multiple textbox added at runtime.
From the source code, I found that one of the textbox's id is as "ctl00_CPHDetail_gvDetail_ctl02_txt_Text1", CPHDetail is the content place holder, and gvDetail is the grid view.
What I wanted to do is to find the text box control and retrieve its value.
So far, this is what I have done, and it was able to return the correct info up to the grid view. It can never find the text box control.
I wonder will it caused by the ct102 between "ctl00_CPHDetail_gvDetail_ctl02_txt_Text1"
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Similar Messages:
Nov 8, 2010
I have a gridview with several ItemTemplates. The first contains a checkbox the rest contain textboxes. I then added dynamically some bound controls like this:
BoundField bdfPrivName = new BoundField();
clsUtilities.SetBoundFieldCenter(ref bdfPrivName, "PrivName", "Priv Name");
BoundField bdfDescription = new BoundField();
clsUtilities.SetBoundFieldLeft(ref bdfDescription, "PrivDesc", "Description");
BoundField bdfLive = new BoundField();
clsUtilities.SetBoundFieldCenter(ref bdfLive, "Live","Active?");
grdExisting.Columns.Add(bdfPrivName);
grdExisting.Columns.Add(bdfDescription);
grdExisting.Columns.Add(bdfLive);
I then use FindControl to locate the checkbox and textboxes and perform my logic based the result
foreach (GridViewRow gvr in grdMissing.Rows) {
mckbAny = (CheckBox)gvr.FindControl("ckbAdd");
mtxtApplyDate = (TextBox)gvr.FindControl("txtAddApplyDate");
mtxtDateToAdd = (TextBox)gvr.FindControl("txtAddDateToAdd");
mtxtDateToRemove = (TextBox)gvr.FindControl("txtAddDateToRemove");
etc.
This all worked fine. I then got a request to put the bound fields as the second, third and fourth columns, after the check box and before the textboxes. I found that this was easy to do by changing the Add's to Inserts as follows:
grdExisting.Columns.Insert(1, bdfPrivName);
grdExisting.Columns.Insert(2, bdfDescription);
grdExisting.Columns.Insert(3, bdfLive);
It looked fine of the page, but the FindControls, all of them fail to work.
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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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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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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
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Jan 10, 2011
I have a aspx. site with a repeater and a HeaderTemp. in this i have this code.
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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.
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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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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:
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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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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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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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Apr 17, 2010
Can Someone explain why this doesn't work here, when it works in another formview?
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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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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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Mar 18, 2011
I have a form with a basic FormView control. The FormView is set to Edit mode by default with only two textboxes and one button. I am populating the FormView using a Datatable from the code behind generated from a SQL Stored Procedure.
The data fills the FormView just fine. I am attempting to update the data using a SQL Stored Procedure by getting the values from the textboxes in the FormView on button click Everything seems to work and I recieve no errors, however the values I type into the textboxes is not passed to the stored procedure so eventhough there are no errors the data is not updated.
I know that the issue is not my stored procedure becasue if I use static values for the parameters in the code behind, the values are updated by the stored procedure.
I placed two plain textboxes and a button on the ASPX form and create a button click event for that button using the same code I use for the butten click event in the formview. When I add values to the non-databound textboxes, the data is updated correctly.
The question is, why can I not get the updated/changed values from textboxes in the FormView control?
Here is my ASPX code:
[Code]....
[Code]....
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Sep 3, 2010
I have a nested FormView and I need to get the values from some of its controls (TextBox) in code behind.
I can easily pull the values from the "parent" FormView using:
TextBox txtBox = (TextBox)fvParent.FindControl("txtField");
String myStr= txtBox.Text;
Although, when I try to get a refence to one of the controls in the "child" FormView I get a null. I am trying to do this:
FormView formView = (FormView)fvParent.FindControl("fvChild");
TextBox txtBox = (TextBox)fvChild.FindControl("txtChildField");
String myStr= txtBox.Text;
The variable "formView" is set to null. Can the FindControl method not find nested items? If not, what is the proper way of getting the values from these fields (in the Child/Nested FormView)?
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Nov 10, 2010
Can one use the findcontrol to access the row.cells value? (C#)
[code]
[Code]....
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I though that this would work, but alas no.
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Feb 9, 2010
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now, I added information to the <headertemplate><table><tr><td>headers</td></tr></table></headertemplate>
and my label in the <itemtemplate><asp:Label id="Label1" runat="server"></asp:label></itemtemplate>
and now when I run my same code, I get [object reference not set to an instance of an object]
what gives? It was working until I added a header template.
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Jun 15, 2010
Label1.text = CType(GridView_MyAds.FindControl("ItemId")
I need this correctly done....
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Jan 6, 2010
In the gridview we are using edit button. Once the edit button click Controls in the edit template will display in the same row with update button. That row has two dropdownlist control.
Process flow:
controls:d1 and d2
d1 is using sqldatasource for item display : working fine.
d2 is using codebehind code to load the item based on the selected value in the d1 : Not working
How to findthe control in the edit template to display item value for d2.
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Mar 28, 2011
I have a dropdownlist embedded into an asp.net gridview. I have successfully populated the dropdown list in the footer but have not been able to populate the dropdownlist in the EditItemTemplate. Here is my code that works. I need to do the exact same thing for a dropdownlist embedded in the update functionality of the gridview.
[Code]....
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Apr 21, 2010
Using vb.net/asp.net 2005 with Ajax.
After I add a new author I am displaying the author inside the gridview in an Accordian and I need to expand the accordian for this one record, in the btn_AddAuthor event I am trying this:
[Code]....
the problem that I am having is that nothing happens: , the accordian is not expanded but I need it to be expanded.
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Sep 14, 2010
I've got a gridview with a few textboxes in each row which I want to insert into a database, after a user clicks a submit button (thats outside of the gridview)
This is my code for the gridview
[Code]....
And this is my code for the button
[Code]....
But when I click the button it gives me this error
"Multiple controls with the same ID 'Label12' were found. FindControl requires that controls have unique IDs."
How do I give the controls unique IDs if they are in a gridview and the rows are database driven?
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Feb 19, 2010
I have this...
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I'm doing this in my Master Page. I want to access a Linkbutton within the Gridview and set the enabled = false; I tested this and it works all the way up to the first if statement.If I insert a response.write to get the frmctrl.ID, I get all of the controls on the page. BUT, can't get the controls within the gridview.How do I get the contorls within the gridview? I prefer not to do this using Findcontorls and esp setting the control to Public.
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Nov 21, 2010
How to use Control Parameter with SQLDataSource When FindControl is required?
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Apr 14, 2010
I have a label control inside of repeater and I can't seem to get FindControl to locate the label inside of the repeater or even the repeater itself. I'm not sure what I'm doing wrong here. OnItemDataBound is firing because "hello1" is being written but if I put anything inside of the For Next loop of rptMarketFundamentals, nothing is run inside of it.
<asp:Repeater id="rptMarketFundmentals" runat="server" DataSourceID="dsMarketFundamentals" OnItemDataBound="rptMarketFundamentals_ItemDataBound">
<asp:Label ID="lblOwnershipCategory" runat="server" Text='<%# Eval("OwnershipCategory") %>' />
</asp:Repeater>
Sub rptMarketFundamentals_ItemDataBound(ByVal Sender As Object, ByVal e As RepeaterItemEventArgs)
Response.Write("hello1") 'this works
Dim dataItem As RepeaterItem
For Each dataItem In rptMarketFundmentals.Items
Response.Write("hello2") 'this does not work
Dim lblOwnershipCategory As Label = CType(dataItem.FindControl("lblOwnershipCategory"), Label)
If lblOwnershipCategory.Text.ToLower = "family firm" Then blOwnershipCategory.CssClass = "highlight"
End If
Next
End Sub
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Apr 16, 2010
I stumbled into a problem which is that FindControl will only return a control in the ListView after the listview has been databound. Here is the code which is not working, and I'm getting the "Object reference not set to an instance of an object error" when I try to add the attribute to the control:
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Any ideas on how I can elegantly fix this?
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