Forms Data Controls :: DetailsView System.NullReference Exception Error
Jan 25, 2011
Im having issues with a webform that previously worked before I added a dropdownlist.selectedindexchanged event related to the data that the details view displayed. I ran it in debugging mode and the variable has a valid value. Heres the line Im getting
the error on:
I am working on a ASP.NET 2.0 application. I get the following exception sometimes when i access the web application. I believe it is related to the server where the application is hosted? Exception of type 'System.OutOfMemoryException' was thrown. 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.OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown. Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace:
I'm working on having two forms that communicate together. In order to do this, I am passing public value from the source page. Here's how I did it:
In the source page I have:
Public ReadOnly Property CurrentCity() As String Get Return txtboxfake.Text End Get End Property Then under page_load of the page I have: Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load txtteam.Text = PreviousPage.CurrentCity txtboxdate.Text = Calendar1.SelectedDate End Sub
For some reason I keep getting an error that says "NullReference exception unhandled by user code" that points to txtteam.text = PreviousPage.CurrentCity.
Panel pnl_Confirmation = (Panel)form1.FindControl("ConfirmationPanel") as Panel; pnl_Confirmation.Visible = false;
I keep getting a "NullReferenceException" in the above code. "ConfirmationPanel" is a panel I show/hide depending on if the form is submitted successfully or not.
The panel is wrapped in a LoginView control, which is why I cannot call "ConfirmationPanel" directly:
Hello all. I created a class that runs fine when using it with web forms, however when i create a Windows service and try to run it I recieve a NullReference error. Im not sure what else to do since the class works fine.Here is a snippet.
The service
public partial class Service1 : ServiceBase { //Timer object Timer RunTime; QBridge bridge_object = new QBridge() double test_interval = 40000; //test value public Service1() { InitializeComponent(); } protected override void OnStart(string[] args) { //Send email notification that intakes were pushed //bridge_object.SendNotification(bridge_object.service_startedtext); RunTime = new Timer(30000); //set the elapsed event RunTime.Elapsed += new ElapsedEventHandler(RunTime_Elapsed); //RunTime.Interval = SetInterval(); //calculated interval RunTime.Interval = test_interval; // test interval RunTime.Enbled = true; //set timer to true //QBridge bridge_object = new QBridge(); //bridge_object.SendNotification("start"); //SendNotification("start"); } protected override void OnStop() { RunTime.Enabled = false; RunTime.Dispose(); try { bridge_object.SendNotification("stop"); } catch (NullReferenceException nre) { System.Windows.Forms.MessageBox.Show("Error " + nre); } catch (Exception er) { System.Windows.Forms.MessageBox.Show("Error " + er); } //SendNotification("end"); } //Included this to test locally. works fine when just calling the method protected void RunTime_Elapsed(object source, ElapsedEventArgs e) { //SendNotification("run"); try { bridge_object.SendNotification(run); } catch (NullReferenceException nre) { System.Windows.Forms.MessageBox.Show("Error " + nre); } catch (Exception er) { System.Windows.Forms.MessageBox.Show("Error " + er); } } public void SendNotification(string email_text) { MailMessage initial = new MailMessage(); initial.Bcc.Add(new MailAddress("")); initial.From = new MailAddress(""); initial.Subject = "Web notification"; initial.IsBodyHtml = true; initial.Body = email_text; SmtpClient mailClient = new SmtpClient("192.168.1.1"); try { mailClient.Send(initial); } catch (Exception ex) { } } } Class using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Net.Mail; using System.IO; using System.Configuration; using System.Data.SqlClient; using System.Data; namespace Intake { public class QBridge { SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString); private string login_error; public QBridge() { } public void SendNotification(string email_text) { MailMessage initial = new MailMessage(); initial.Bcc.Add(new MailAddress("")); initial.From = new MailAddress(""); initial.Subject = "Web notification"; initial.IsBodyHtml = true; initial.Body = email_text; SmtpClient mailClient = new SmtpClient("192.168.1.1"); try { mailClient.Send(initial); } catch (Exception ex) { } } } }
I have some code to build a multi level menu. It is throwing a system.outofmemory exception on the lineRepeater3.DataSource = level3Here is my full code, sorry its a bit long and tangled. Please can you tell me how to diagnose the problem and if poss how to solve it.
When i fill my sql adapter daAuthors.Fill(dsPubs, "MYTable") sometime i get A first chance exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dllmy code can run for a lot hours without any problems but sometime i get the message
am trying to implement fluent nhibernate in MVC project...there were no build errors... but when i run the project i get this exception
System.Xml.Schema.XmlSchemaValidationException: The element 'class' in namespace 'urn:nhibernate-mapping-2.2' has incomplete content. List of possible elements expected: 'meta, subselect, cache, synchronize, comment, tuplizer, id, composite-id' in namespace 'urn:nhibernate-mapping-2.2'.
have no idea what am doing wrong here... the following is the code for opening session factory...
I have a grid that displays all the years sales cost and billing margin (1-(cost/sales)) but it seems on some years there is a cost but no sale and it is giving me a cannot divide by 0 error on running. how can i make it where if it cannot give the BM then it will say N/A or something instead of erroring out?
I have a gridview and detailsview on the same page. The detailsview is defaultmode="insert" and works perfectly (Role, Site and Department are all bound to ddls). The gridview displays information fine and deletes fine - but when i click edit it breaks. But i dont understand why as it is using the methods and data sources as the gridview. I did a test run on this a few weeks back and it worked in visual web developer, lost all the data when i formatted the hdd and now - i cant get it to work, but i am sure its exactly the same. error is
DataBinding: 'System.Data.DataRowView' does not contain a property with the nameXXXX.
It does that on each of the ddls for site, role and department. But the property is there! i can see it when i test my SPROCS and they display / work fine in the detailsview.
Error List, front page (default.aspx) reads as follows:
Warning 1 The class or CssClass value is not defined. 11 59 Warning 2 The class or CssClass value is not defined. 43 32 Error 3 Name 'MetaModel' is not declared. 9 57
Compilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. Compiler Error Message: BC30456: 'DetailsView1_ItemCommand' is not a member of 'ASP.default_aspx'.Source Error:
I have a GridView that when you click a button it opens up a Panel inside a ModelPopupExtender - this uses a detailsView to show the details of the selected item from the GridView. I have added a button that I was using to update these details.
Problem is I get the error:
[Code]....
I added the update parameters to the SQL Data Source of the DetailsView, but this hasn't done the trick...
I suspect I am doing or missing something here, but I am not 100% sure
Would someone be kind enough to point me in the right directions or suggest weblinks that details this kind of requirement,
I had this one working a while back i try to upload file to my root folder it works locally but when i try it from my website i get the following error: exception details: system.bet .webexception. unable to connect to the remote server
the code bomb at the following line
requestStream = uploadRequest.GetRequestStream() 'This is where the exception occurs fileStream = File.Open(localFile, FileMode.Open) [code]....
I've got a master table and a child table. The master table has a nullable column called ReferenceID and in some cases it should be NULL, but when it's null in a record, I get an error while going to Edit mode of DetailsView.
In Read Only mode all everything is OK, but when I click on Edit and Postback happens, I get the following error: Server Error in '/Sample' Application. 'DropDownList_Reference ' has a SelectedValue which is invalid because it does not exist in the list of items.Parameter name: value It means that in MasterTable, the ReferenceID shouldn't be NULL, but it should be in some cases.
I have a working gridView/DetailsView used as a member Lookup.
Some Fields in the Details View have data only some of the time, and when there isn't any, I want to suppress that row of the detail. No Go.
It seems that some of the function available in other controls don't exist so I cannot make the "field and its "header" Visible = "False"
FWIW, The control is nested inside a loginview control.
[Code]....
When I try and put logiin the control the error I get is:
Error 156 Literal content ('<asp:TemplateField ItemStyle-Wrap="false" HeaderText="PO Box:" Visible="') is not allowed within a 'System.Web.UI.WebControls.DataControlFieldCollection'. C:UsersBillDocumentsMy Web SitesNausetNewcomersMembershipCopy of Lookup.aspx 345
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.
Public Sub btnSave_Click(ByVal sender As Object, ByVal e As System.EventArgs)Line 246: 'Dim thv As GridView = TryCast(Me.FindControl("grd1"), GridView)Line 247: Dim lbltargetdir As Label = TryCast(TryCast(Me.FindControl("grd1"), GridView).FindControl("lblparentpath"), Label)Line 248:Line 249: Directory.CreateDirectory(lbltargetdir.Text.ToString() & nm.Text)
I'm trying to throw the exception back to Page_Load but the throw statement causes error: ArgumentNullException was unhandled by user code. How can that be fixed? Also, I can't see Label1.Text displayed on the page after the ArgumentNullException occurs because the page is not re-load. If there is no exception, it's fine to not reload the page. How can I see the Label1.Text displayed?
I'm trying to build a chart in my application which will act as a client for an ASP.NET 3.5 web service that I created. The error I get is as follows:
Series data points do not support values of type System.Data.DataViewManagerListItemTypeDescriptor only values of these types can be used: Double, Decimal, Single, int, long, uint, ulong, String, DateTime, short, ushort.
I've tried various ways to resolve this but can't. This error points at the chtStats.DataBind() line in the code below: