Web Forms :: Null Reference - Not Finished Creating Component?
May 25, 2010I have a custom component:
[Code]....
[Code]....
I try to create a new component instance like this:[Code]....
[Code]....
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MVC :: How To Use Reference Type To Change Not Null To Null Parameter
Feb 24, 2010I am using dropdownlist in my view page with some values which will display corresponding ID(primary key of other table) in my database.If i leave my dropdownlist blank and save it in database then its showing null parameter error. Can you explain how to use this reference type to overcome this error
View 2 RepliesCreating Dynamic Http Response From Component
May 14, 2010I've developed a component which processes online payments. At a specific point the user must be redirected to the selected acquirer web site for authentication. The acquirer itself suggests that there should be a web page which does it. Something such as the following,
<!--TakeOff.aspx-->
<html xmlns="[URL]">
<head id="Head1" runat="server">
<title>@</title>
<script type="text/javascript">
function Go() {
form1.submit();
}
</script>
</head>
<body onload="Go();">
<form id="form1" runat="server" method="post" action="/...">
<div>
<asp:HiddenField ID="MID" runat="server" />
<asp:HiddenField ID="Amount" runat="server" />
<asp:HiddenField ID="ResNum" runat="server" />
<asp:HiddenField ID="RedirectURL" runat="server" />
</div>
</form>
</body>
</html>
This page redirects the user and posts required arguments to the acquirer's web site. Prior to this page there is another page with a payment button (for example). In the click event of the payment button my component is instantiated and required calculation is done. Something such as the following,
protected void btnPayment_Click(object sender, EventArgs e)
{
try
{
var paymentProcessor = new NS.PaymentProcessor(/*required arguments*/);
/*...*/
NS.Result result = paymentProcessor.Calc();
Session.Add("PaymentProcessResult", result);
Response.Redirect("TakeOff.aspx");
}
catch (Exception p)
{
throw p;
}
}
What I'm going to do is to generate [TakeOff.aspx] page at run-time by the payment processor component instead of having static page (I mean aspx pages that are generated during development phase). The reason why is that we may have different acquirers and each acquirer requires its own arguments to be posted. So if the payment processor component generates aspx or even html pages at run-time we do not need recompile and redeploy the web application.
My problem is that I do not know how to generate aspx pages at run-time. I'm not an ASP.NET guru and all efforts that I've made using HttpResponse were in vain as the original page does not transfer the control to the generated page.
Configuration :: Creating An Instance Of The COM Component With CLSID
May 22, 2010I Have written code to create instance of an AUTOCAD application.
private void InitializeAutocad()
{
try
{
acApp = (Autodesk.AutoCAD.Interop.AcadApplication)Marshal.GetActiveObject(progID);
}
catch
{
try
{
Type acType = Type.GetTypeFromProgID(progID);
acApp = (Autodesk.AutoCAD.Interop.AcadApplication)Activator.CreateInstance(acType, true);
}
catch(System.Exception ex) { }
}
}
but it throws the above error.
Web Forms :: Variable Used Before It Is Assigned Value Null Reference Could?
Sep 10, 2010xamount is receiving this message on the last line. The session is being set in the previous page. Is there a way to resolve the message or should I just use a previous page postback
[Code]....
Check For A Null Object Reference When Validating Forms In MVC?
May 28, 2010I'm experimenting with validating forms in the asp.net MVC framework. I'm focusing on server side validation for the time being. I've come across an error that I'm not sure how to rectify. System.NullReferenceException: Object reference not set to an instance of an object. The code that throws the error is:
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Create([Bind(Exclude="ID")] MembersCreate mc )
{
mc.Modules = ModuleListDataContext.GetModuleList();
ViewData.Model = mc;
//Validation using ModelState
//
//
//line below errors when form field is empty
//
if ((string)mc.Member.Username.Trim() == "")
ModelState.AddModelError("Member.Username", "Username is required.");
if (!ModelState.IsValid)
return View();
try
{
// TODO: Add insert logic here
return RedirectToAction("Index","Home");
}
catch
{
return View();
}
}
When I put spaces in the field it performs exactly as i want, but if I leave the field blank and press submit I get the error. What's the best way to avoid this error and still validate blank form fields?
Web Forms :: Accessing UserControl TextBox Null Reference?
Jan 20, 2011I have a .ascx file residing in another page which has a button on it. On click I run a select statement that accesses the textbox for a value.
However, it keeps returning a Null Exception Error. I am trying access the textbox and its text through
[Code]....
I also tried -[Code]....
I also tried -[Code]....
But none of them work. Please can someone advise me how I find the textbox and then access its text?I have looked round the forums / google and cant find a way of doing this!
Web Forms :: Null Reference Exception In Document.getElementById?
Dec 10, 2010I am getting the Null reference exception in
[Code]....
also when I used the Quickwatch, I get this error message.
getElementById The name 'getElementById' does not exist in the current context
I am also using Master Pages.
Web Forms :: FileUpload PostedFile Gives NULL Reference Exception
Jul 9, 2012This is my button event code
protected void ImageButton2_Click1(object sender, ImageClickEventArgs e)
{
string data = Server.UrlDecode(Request.QueryString["BehCode3"]);
string filename = System.IO.Path.GetFileName(fup1.PostedFile.FileName);
string filename1 = System.IO.Path.GetFileName(fup2.PostedFile.FileName);
string filename2 = System.IO.Path.GetFileName(fup3.PostedFile.FileName);
[Code]...
Web Forms :: Master Page Controls Cause Null Reference Exceptions?
Mar 10, 2010I've got a master page where I've created two content place holders ('menu content place holder' and 'main body content place holder'). I've placed several controls (drop down lists and a calendar) in one of these content place holders (the 'menu content place holder'). In my content page I've set the 'menu content place holder' to 'Default to Master page content'. In my 'main body content place holder' I've included several controls (table, labels) which depend on the user selected items in the 'menu content place holder'.
After including a reference in all the necessary places- like this:
DropDownList ddlList1 = Master.FindControl("ddlList1")
as
DropDownList;
I still get the following exception (this exception occurs in my content page):
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:
[Code]....
Web Forms :: Onclick Event Giving Null Reference Exception?
Dec 15, 2010let me see if I can explain this clearly. I have a gridview control
and I am trying to use the Edit function. In my gridview, there are numerous rows. I pick one to change and click Edit. I then see the boss name in my gridview and click "Change". When I click Change, I'm expecting two fields to appear, one is a label, the other is a DropDownList. I get this error when I click:
System.NullReferenceException was unhandled by user code
Message=Object reference not set to an instance of an object.
Source=App_Web_lzmklgbg
StackTrace:
at Training_TRManageOrg.LinkButton1_Click(Object sender, EventArgs e) in d:projectsediting.aspx.cs:line 108
at System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e)
at System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument)
at System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
InnerException:
Gridview HTML:
<asp:TemplateField HeaderText="Director">
<EditItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("director") %>'></asp:Label>
<asp:LinkButton ID="LinkButton1" runat="server" OnClick="LinkButton1_Click">Change</asp:LinkButton>
<asp:Label ID="Label4" runat="server" Text="Director" Visible="False"></asp:Label>
-
<asp:DropDownList ID="DropDownList2" runat="server" DataSourceID="trDirector"
DataTextField="name" DataValueField="id" onselectedindexchanged="DropDownList2_SelectedIndexChanged"
Visible="False"></asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("director") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
Code Behind:
protected void LinkButton1_Click(object sender, EventArgs e)
{
DropDownList DropDownList1 = ((DropDownList)FindControl("DropDownList1"));
DropDownList1.Visible = true; // this line is where the exception occurs
Label3.Visible = true;
}
I figure I must be overlooking something so I'm asking what am I missing?
Web Forms :: How To Avoid Null Object Reference Page Load
Nov 18, 2010I have a user control with GridView. GridView template has label that suppose to get custom object value Name.
aspx:
<asp:Label ID="lblImage" runat="server" Text='<%# MyData.Name%>' />
cs:
public MyObject MyData;
During page loading MyData object is null, so I'm getting exception: "Object reference not set to an instance of an object.".
How to avoid the error?
Web Forms :: User Control Causing Null Reference Exception?
Oct 19, 2010I am stuck into a problem, i have a user control ProductListing.ascx that contains ListView binded to an object datasource, SelectMethod and SelectCountmethod are provided as well. Everything works fine but the problem started when i add another user control declarativlly Filter.ascx in the productListing.ascx. I want to assign value to a public property MaxPrice in Filter.ascx. I am trying to set this property in the SelectMethod of ObjectDataSource. Usercontrol "Filter.ascx" throws null reference exception when i try to set its MaxPrice Property.
I tried to acced the usercontrol in Databind method of ListView , it is accessible here but viewstate is empty at this point, i saved the value in viewstate in SelectMethod of objectDatasource but i cant access viewstate in ListView Databind. Its empty. Its a simple code and no rewriting to viewstate elsewhere.
Important: My Codebehind files are in a seperate project and .ascx files in seperate project
Web Forms :: Page.FindControl Causing Null Reference Exception?
Aug 20, 2010I developed a page in VWD 2008 and it works perfectly locally, but when I deployed it on the server every Page.FindControl() call is causing the NullReference Exception "Object reference not set to an instance of an object. " Can anyone help me out? Code is below
[Code]....
Forms Data Controls :: Update A Datalist Null Reference?
Nov 2, 2010So I have followed this tutorial to try and me edit a record in a datalist.
[URL]
When I click update after updating anyfield it throws a NullReferenceException was unhandled by the user code. Here is my code.
protected void DataList1_UpdateCommand(object source,
Forms Data Controls :: Null Reference Exception Was Not Handled By User?
Sep 2, 2010Null Reference Exception was not handled by user Object Reference not set to instance of an object
View 2 RepliesForms Data Controls :: Getting Null Reference On Labels That Im Setting The Values To?
Mar 23, 2010Why would i be getting NullReferenceException if im setting the labels with values?In my page_load i have the following:
Label hireMess = (Label)FormView1.FindControl("hireMess");
Label hireEnd = (Label)FormView1.FindControl("hireEnd");
HyperLink hyptry = (HyperLink)FormView1.FindControl("hyptry");
and right below that i have 1 condition to check for and then set the Text value of the 2 labels.hireMess.Text = "It Was Successfully!";hireEnd.Text ="You will be re-directed to your Pool in 10 seconds.";I compared the page to production and eveyrthing is the same and production doesnt have any issues.. not sure why its coming up null.The error comes up for the first label: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:
[Code]....
Forms Data Controls :: Null Reference Exception In Grid View?
May 19, 2010i have null reference exception in grid view, in the
string s = ((Label)GridView1.FindControl("Label6")).Text;
i tryed this to e.Values["EventId"].ToString()
but still the some why is that?
the full code :
[Code]....
Web Forms :: Code-Behind Null Reference Exception Accessing Controls With Derived PageBase?
Feb 16, 2010I have a class that derives from System.Web.UI.Page and have set my pages to derive from this custom page class instead of Page. At runtime, the controls are never initialized and throw a NullReferenceException. I've changed some class names and namespaces in the pasted code to protect the innocent. The only thing that I currently override in my PageBase is OnPreLoad and I do call the base.OnPreLoad. I'll eventually add more functionality to this PageBase but for now all that it has is this:
[Code]....
I've tried putting this into a class library (with System.Web referenced) and I've also tried moving the class into the web application and had the same results either way. As another strange twist, I have another class with derives from PageBase called IndexPageBase and it doesn't have this problem:
[Code]....
[Code]....
[Code]....
Forms Data Controls :: Gridview Update Not Working / Giving Null Object Reference Error?
Jan 14, 2010I have a gridview,when i do it is giving me null object reference error.
I am posting my code for your reference -
[Code]....
My gridview code is -
[Code]....
Web Forms :: Master Page Function Listing Component In Child Page (asp:Localize Component)
May 18, 2010I would like to know how can I list for every page (child page) selected the number and id of localize component in the current page. I need this to update resources files, a button will be on the master page and when they click on it, they will go to a page which show up every data in the resource file.
View 1 RepliesAsp.net - Null Reference Getting REMOTE_ADDR
Apr 16, 2010I have an ASMX web service running under IIS7 in classic mode. This service has the following code:
try
{
env.ExternalIP = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
}
catch (Exception ex)[code]....
This results in the following stack trace. I only modified the names of usercode call stack here to protect the innocent:
Message: An Exception of type: NullReferenceException occured in method: GetAdditionalServerVar
ExceptionMsg: Object reference not set to an instance of an object.
===Stack Trace===
at System.Web.Hosting.ISAPIWorkerRequestInProc.GetAdditionalServerVar(Int32 index)
at System.Web.Hosting.ISAPIWorkerRequestInProc.GetServerVariable(String name)
I'm at a loss here as this is very basic plain vanilla code.
EDIT.This gets even stranger. I have added some basic code just wondering what server variables I can get at this point. This fails with the same exception when I try and get all the keys:
System.NullReferenceException: Object
reference not set to an instance of an
object. at[code]....
When I was looking at the framework code looks like this could happen when the array which caches the server variables isn't populated and it looks like this occurs when there a null pointer to some Context...which seems like a fairly core piece of the framework code.
I suppose it's time to burn up one of our support tickets with Microsoft.
Null Reference Exception ?
Sep 1, 2010I'm getting a null reference exception whenever I try to databind this datatable to the Gridview. I know for sure that the datatable has data. I've checked it.
[Code]....
I get the error when it gets to the last line here..
DataSource Controls :: How To Fail Data Flow Component From Script Component
Aug 3, 2010I am trying to stop the data flow when certain conditions happen in the script component. Like if a row in the data set has an invalid date, I dont want that dataset to be inserted in the tables or go through OLEDB Destination, rather I want the entire data flow for that dataset to stop and go back to the control flow page.
I have tried mulitple solutions but nothing worked. Conditional Split ends up inserting the correct rows, but I just dont want anyting to be inserted when one row is bad, where as I do want the entire dataset to be inserted if all rows are good.
How can I fail the component when certain conditions happen int eh script component.
Forms Data Controls :: There Is Already A Component Named ".." Component Must Have A Unique Name
Feb 10, 2011i got a problem.. how i can declare template textbox in a datagrid at code behind? i already make a stored procedure and put the update query inside it.. if i declare the textbox inside code behind(.aspx.vb).. there will be an error.. " there is already a component named "txtitem1"component must have a unique name.."
Dim con As New SqlConnection(ConfigurationSettings.AppSettings("ConnectionString1"))
Dim cmd As New SqlCommand
Dim sda As New SqlDataAdapter
cmd.CommandType = CommandType.StoredProcedure
cmd.CommandText = "ETendering3"
cmd.Parameters.Add("@item", SqlDbType.NVarChar).Value = txtitem1.Text
cmd.Parameters.Add("@price", SqlDbType.Decimal).Value = txtprice1.Text
cmd.Parameters.Add("@remark", SqlDbType.NVarChar).Value = txtremark1.Text
cmd.Parameters.Add("@consump", SqlDbType.Decimal).Value = txtconsump1.Text
cmd.Parameters.Add("@value", SqlDbType.Decimal).Value = txtvalue1.Text
cmd.Connection = con
Try
con.Open()
DataGrid12.DataSource = cmd.ExecuteReader()
DataGrid12.DataBind()
Finally
con.Close()
End Try
con.Dispose()
cmd.Dispose()
con = Nothing
cmd = Nothing
_______________________________________________________
.aspx
<Columns>
<asp:BoundColumn DataField="Listing_Id" HeaderText="Listing"></asp:BoundColumn>
<asp:BoundColumn DataField="No" HeaderText="No"></asp:BoundColumn>
<asp:BoundColumn DataField="Item_Category" HeaderText="Category"></asp:BoundColumn>
<asp:TemplateColumn HeaderText="Description">
<ItemTemplate>
<asp:TextBox id=TextBox1 runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Item_Description") %>'>
</asp:TextBox>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox id="txtitem1" runat="server"></asp:TextBox>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="Price" FooterText=" 10/50">
<ItemTemplate>
<asp:TextBox id=TextBox3 runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Price") %>'>
</asp:TextBox>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox id="txtprice1" runat="server"></asp:TextBox>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="Remarks">
<ItemTemplate>
<asp:TextBox id=TextBox2 runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Remark") %>'>
</asp:TextBox>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox id="txtremark1" runat="server"></asp:TextBox>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="Consumption">
<ItemTemplate>
<asp:TextBox runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Consumption") %>'>
</asp:TextBox>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtconsump1"></asp:TextBox>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="Value">
<ItemTemplate>
<asp:TextBox runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Value") %>'>
</asp:TextBox>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtvalue1"></asp:TextBox>
</EditItemTemplate>
</asp:TemplateColumn>
</Columns>