The thing I don't like about FindControl() is the string parameter. If the ID has been changed the compiler won't pickup the error. The error will only occur at runtime. It would be nice if we could get the reference using a method that the compiler would check at compile time?
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I have a Default.aspx program that contains a Treeview with a SiteMapDataSource. I also have a web.sitemap loaded up with urls. When I run the deafult app I get the tree layout that matches the numbers of options but no text on any of the options to click.
View 1 RepliesI 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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How can i use findControl and how can i get id's according to FindControl method? i need to get all TextBox data there are 40 textbox. And TextBoxid data... i reall want to learn also linq method ;)
protected void Button1_Click(object sender, EventArgs e)
{
// SetRecursiveTextBoxAndLabels(PlaceHolder1);
CreateForm creater = new CreateForm();
creater.Holder = PlaceHolder1;
creater.SetAccessForm();
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In default.aspx, there is a label as "lblBar".In one user control, I added a code below:
Dim lblBar_Local As Label = CType(Me.Page.FindControl("lblBar"), Label)
lblBar_Local.text="Test"
But lblBar never display "Test".What is wrong with my code?
I have a Gridview and when the edit button is clicked the details of that row is displayed using a detailsview. While displaying, I need to find a control in detailsView, and then bind it with a Datasource. First of All I'm not sure about the event to be used but have used DetailsView1_DataBound. However, if I have to find the control using:
var control=(ControlType)DetailsView1.Findcontrol("ID");
Always returns null. May be I am not using the right event, and it couldn't find the control at that point.
I have a situation where I need to dynamically disable certain controls. I will not be knowing the type of control. I tried to use FindControl(""), but this does not have the "Enabled" property, it only has "Visible" property.
Kindly let me know how this can be done.
I know now normally you can get the value of a text input using the following:
txtName.Text
But because my input is inside of a LoginView I am using FindControl like this:
LoginView1.FindControl("txtComment")
This successfully find the text input but returns its type rather than the value. Adding the Text function at the end does not work.
This code works:
<div id="GridDiv" runat="server">
gridview would go in here....
</div>
GridDiv.Visible=false;
However, because I have a Div in LoginView2 I have to find with findcontrol.
This is not work:
LoginView Div = LoginView2.FindControl("GridDiv") as LoginView;
Div.Visible = false;
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:
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Line 785:
Line 786:
Line 787: Div.Visible = false;
I am trying to retrieve two listviews from an ascx control for the purpose of saving them to a PDF file:
<TagCloud:TagCloudControl ID="TagCloudControl1" runat="server" />
I get the following error: TagCloudControl1 is a field but is used like a type and an object reference is required for the non-static field, method or property..
ListView lv1 = (TagCloudControl1)ListView.FindControl("ListView1");
ListView lv2 = (TagCloudControl1)ListView.FindControl("ListView2");
lv1.RenderControl(htWriter);
lv2.RenderControl(htWriter);
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.
I'm trying to write a simple file upload page using ASP MVC2.I've read some blog post so I started like this
foreach (string file in Request.Files) { HttpPostedFileBase hpf = Request.Files[file] as HttpPostedFileBase; f (hpf.ContentLength > 0) { tring filePath = Path.Combine(HttpContext.Server.MapPath("../Uploads") , Path.GetFileName(hpf.FileName));
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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"
I did what should have been a simple code that changes an image inside a loginview based upon the date. It says "object references not set to an instance" which mean Nope can't find it. But I dont see anything wrong with my code
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Page
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I want to access controls and update database with their value. Notice using following code:
void grdList_UpdateCommand(object source, GridCommandEventArgs e)
{
string str = ((RadTextBox)e.Item.FindControl("txtLookupItemValue")).Text;
}
I have access to control txtLookupItemValue, but it contains before-edit content, not actual value that user has entered.
Example code:
var div = new HtmlGenericControl("div");
div.Controls.Add(new Literal() { ID = "litSomeLit" });
var lit = (Literal)div.FindControl("litSomeLit");
Assert.IsNotNull(lit);
This code fails the assert, because lit is null. Debugging shows that div.Controls definitely contains a literal with ID of "litSomeLit." My questions are "Why?" and "Is there any way to get a control of a specific ID without doing a recursive search of div.Controls[] by hand one element at a time?"
The reason I'm doing things this way is that my actual application is not so straightforward- a method I'm writing is given a complex control with several subcontrols in a number of possible configurations. I need to access a specific control several layers down (eg, the control with ID "txtSpecificControl" might be at StartingControl.Controls[0].Controls[2].Controls[1].Controls[3]). Normally I could just do FindControl("txtSpecificControl"), but that does not seem to work when the controls were just dynamically created (as in the above example code).
I add a select control to a ASPX page like below:
hgc = new HtmlGenericControl();
hgc.InnerHtml = @"<select runat='server' id='my_selectlist'>
<option value='volvo'>Volvo</option>
<option value='saab'>Saab</option>
<option value='mercedes'>Mercedes</option>
<option value='audi'>Audi</option>
</select>";
Then in a Button click event, I use the code below, try to get the value selected
HtmlSelect s = (HtmlSelect)hgc.FindControl("my_selectlist");
label.Text = s.Value;
I get a error:"Object reference not set to an instance of an object."Does anyone try it before?
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:
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I pass this id from here:
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This is my code behind which is driving me crazy :(
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When I use label to display the STRING INTIME, IT GIVES ME "textboxCashier1In"
BUT WHEN I DO THIS:
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Using VB.Net/ASP.Net 2005
I have a gridview that can have one of many sqlDataSources binded to it.
I want a concise way to get the sqlDataSource Control attached to it and use that control. Something like this (but this syntax does not work):
<CODE>
Dim inUseSQLDataSrce
As SqlDataSource
inUseSQLDataSrce = (SqlDataSource)this.FindControl(grdvAGridView.DataSource)
</CODE>
What is the right syntax for this?
Is this the right declaration of findcontrol for complete step of createuserwizard1 ?Dim UserName As TextBox =reateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("Label11")But when i use it its shows the error object expected
View 1 RepliesI need to be able to set a textbox's (which is inside a gridview row) text to a certain string in runtime. I have used FindControl before, but can't figure out the syntax for actually setting the value of the textbox rather than just getting. Here's what I have, which doesn't compile:
((TextBox)e.Row.FindControl("txtPath")).Text = dataMap.GetString("targetPath"));
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)
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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I've dynamically made a table that a TD and the TD g onclick="document.location=page1.aspx" (all in the aspx.cs) page, and an ImageButton in it, with imagebutton1.Attributes.Add("z-index", "1000"); and imagebutton1.Click += new ImageClickEventHandler(imagebutton1_Click);, when i click outside of the imagebutton it redirects me to page1.aspx, and when I click inside the imagebutton it does the imagebutton1_Click() function that I made
View 8 RepliesI'm writing a simple C# Windows Form app, I send it to a website, and on the website there is a Drop Down menu with options. I want to extract those options and add it to my own drop down menu on my app.
So far, I've written something like this:
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