Asp.net - ArgumentNullException When Accessing A FormView Instance?
Jan 5, 2011
i have an ASP.NET page which has a numebr of user controls within it. There are 2 user controls which are of interest. I need to display either one of them or neither of them, depending on the record selected previously.
In the user controls I need to set properties of some controls which are in a FormView. So in my user control code-behind I have a number of properties which look something like this:
[Code]...
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Feb 10, 2009
I have 2 formviews, the first SELECTS the SUM of one of my fields in my tablr and displays the result in a label. The second contains a form that submits data into this table. When i submit a new value into the second form i want the first form to update. My VB currently has:
[Code]....
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Nov 12, 2010
i have
VariableA as Class1
Variable1 as string
Variable1 = "VariableA"
I want to be able to use Variable1 to get access to VariableA(?).
So i want to able to do something like
VariableA.Property1 = "test"
But like this:
Variable1.Property1 = "test"
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Nov 1, 2011
I was using the following code within a class and creating an instance of that class from within my main form (Main.vb):Dim count As Integer = Main.DbDataSet.Accounts.CountThis was returning the count of accounts within my database.After changing the code so that I could run this in a background thread to save locking up the program, as more data is processed after this point, the count was returning 0 each time.
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Aug 10, 2010
I have written an MDI text Editor and I have written a "save" sub routine, please see below
'This sub routine updates the current document or calls the save as routine
Private Sub SaveToolStripButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SaveToolStripButton.Click, SaveToolStripMenuItem.Click
[code]....
I am testing this sub routine today and it throws up an error during runtime when a new document is created and the user (me in this case) writes a few lines of text, I click the save toolstrip button and because its a new document, the save as sub routine is supposed to be be invoked, however the application stops running and I get this error message "ArgumentNullException was Unhandled" from Visual Basic.
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May 17, 2010
[code] I'm basically trying to see if a record already exists. My problem is when I run this I get a "ArgumentNullException was unhandled" error It occurs on the line "dbAdapter.Fill(output)" in the sub.
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Feb 3, 2010
I am using 2005 and I am getting a ArgumentNullException when I try and debug my program. I have included the error and a piece of the code. I am not sure how to fix this error at all. If more of the code is needed I can post it.
Public
Class MainForm
Dim sPIServer As String 'PI Server Connection Storage Variable
Dim myServer As PISDK.Server 'Variable to hold the server to work on[code].....
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Jan 31, 2012
why this gives an error at run-time:
Dim mightBeNothing As List(Of String) = Nothing
Dim a As List(Of String) = IIf(mightBeNothing Is Nothing, New List(Of String)(), New List(Of String)(mightBeNothing))
I am getting ArgumentNullException on the second line. If I replace the last part with:
Dim a As List(Of String) = IIf(mightBeNothing Is Nothing, New List(Of String)(), New List(Of String)())
It works - but the constructor New List(Of String)(mightBeNothing) will never be called if mightBeNothing is nothing, so what is the issue?
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Dec 27, 2010
I've been having problems with following code on some computers, while it's worked super on others (most):
Dim xmlSer As New System.Xml.Serialization.XmlSerializer(GetType(XMLContext))
which produces the stacktrace:
System.ArgumentNullException: Value cannot be null.
Parameter name: type
at System.Xml.Serialization.XmlSerializer..ctor(Type type, String defaultNamespace)
How can that code throw that exception, when the argument is drawn from a gettype call, and note that it doesn't happen when debugging on my own PC, only when it's installed on some of the client PC's???
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Feb 25, 2011
I'm getting the following exception when I try to run up my Winforms app and haven't been able to find a solution to it:
System.ArgumentNullException was unhandled
Message=Value cannot be null.
Parameter name: activationContext
[code]....
I've added a handler for the "unhandled error" event in the applicationevents class but it never reaches that stage and there is no source code running that I can break into and diagnose.
The application was fine until I added a user control (nothing fancy, just a standard windows user control) and then dragged it onto a form in the app (user control and form were in the same application). The application builds and compiles without any errors or warnings but when I attempt to run it up I get the above error straight away.
Does anyone have any idea what it could be or even how I can go about investigating it? I'm a bit stumped on this one as I'm not sure how to investigate it. I removed the user control from the form and then I removed the user control from the application entirely but the error hasn't gone away. In all honesty the addition of the user control might be a red herring but the problem manifested straight after adding it.
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May 15, 2011
I have an ASP.NET page with a Wizard control containing several steps and about 80 form fields. The data is collected and inserted to a database from the code behind page. I need to set this form up so you can not only insert, but edit a record as well. So I want to databind the fields. I'd rather not use a FormView because then I would have to revise my existing code, since you can't access controls inside a FormView directly. Is there a way to databind the fields without using a FormView?
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Jun 8, 2010
I have an ASP.NET page with a Wizard control containing several steps and about 80 form fields. The data is collected and inserted to a database from the code behind page. I need to set this form up so you can not only insert, but edit a record as well. So I want to databind the fields. I'd rather not use a FormView because then I would have to revise my existing code, since you can't access controls inside a FormView directly. Is there a way to databind the fields without using a FormView? I'm new at this by the way so sorry if the answer should be obvi
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Dec 15, 2011
I am using two formview to insert,update data. but I want don't want space between this two formview. So how can i remove that space? Can i use cssclass to remove that place?
here is the Html code.
<table class="fv">
<tr>
<td colspan="2" class="style12"><b>Select Subscriber</b></td><td class="td" colspan="2" align="right"> * Required Field</td>
[Code].....
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Mar 5, 2012
My code is executing the OnItemInserting function but not the OnItemInserted. Have I declared the Inserted function correctly?
aspx
<asp:FormView ID="FormView1" runat="server" DefaultMode="Insert" OnItemInserting="Insert" OnItemInserted="Inserted">
vb
Protected Sub Insert(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.FormViewInsertEventArgs) Handles FormView1.ItemInserting' WorksEnd Sub Protected Sub Inserted(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.FormViewInsertedEventArgs) Handles FormView1.ItemInserted Response.Redirect("Login.aspx") ' Never gets here End Sub
The code never enters the Inserted function and just refreshes the form after executing the Insert
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Jun 1, 2011
I have followed this tutorial for the most part to explain what I am doing. [URL]. What I need to do is figure out the best way to approach to be able to update my formview. I do not understand what the tutorial is trying to explain to me so i tried it the way I have updated a gridview before. But I am receiving "No parameterless constructor defined for this object." I tried to debug and view the callstack but it does not really tell me much.
I have my sql stored procedure to update which when executed works fine. I also have another class in which I reference the application details class.
applicant.vb
This is the code in order for when you click the view details link on the gridview it passes you off to another page that shows that applicants details it is within the same applicant.vb class. I am trying to update using the following method on the .aspx page but I receive the following error "No parameterless constructor defined for this object."
Memberdetails.aspx
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Dec 1, 2009
I have a form with a tabcontrol. Each tab has a formview for adding/updating data. The user could have multiple formviews open at once. I would like a way to prompt the user to save if they are leaving the screen.[code]...
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May 3, 2012
I have the following inside a formview, I want to be able to show the information and if anyone makes changes I should update this information by clicking on update.I am fairly new to asp.net development , how can I do it? I keep having exception, saying frm1 is expecting editmode.
<<asp:Formview D="FormView1" runat="server" DataSourceID="SqlDesc" ID="frm1">
<ItemTemplate>
<table>
<tr>
[code]....
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Jun 24, 2009
Here the code behind... I'm trying to retrieve this control so I can add items to the drop down list (I'm retrieving the Role Groups to add to the drop down list in the code-behind)
Protected Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim DDRoleGroups As DropDownList
[code].....
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Aug 18, 2011
I have a simple FormView in a ASP.Net application. However when there are no records in the datasource, the control completely hides itself. I need to be able to have the end user add the first record view the FormView. Is there any way around this behavior?
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Jun 15, 2010
I have an ASP pg with a formview list control on it that hooks up to a sql database customer table. I want to access the customer name outside the form.
How do I:
A) access the bound text box in the form view template? Something like Text1.text=formview1.customername.text (that doesn't work but that's the kinda thing)
B) access the database field in the table that the sqlsource connects to to feed the formview
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Jul 22, 2009
VS 2008, SQL Server 2008:I have a formview that holds data about a test.Each test can have many people assigned to run the test.I have 1 table to hold JobNumber (Unique) with all associated data I have a 2nd table to hold JobNumber And AssignedToID to have records for each person assigned to the Job.Right now I have it set up so the user will choose as many AssignedToIDs as they want and it populates a list box. The list box is a bound control. Can I populate the 2nd table with the contents of the list box?On the update of the formview I could loop through the contents of the list box and update the data 1 by 1 but it will be a pain when users remove assignees.
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Aug 10, 2011
I have this simple code,
Protected Sub grdSearch_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles grdSearch.SelectedIndexChanged
TimeOff.Where = "UserName=""" & grdSearch.SelectedValue & """"
End Sub
Doing so causes this error, 'UserName' could not be resolved in the current scope or context. Make sure that all referenced variables are in scope, that required schemas are loaded, and that namespaces are referenced correctly. Near simple identifier, line 6, column 1.
The datasource works fine before the where property is set.Update: I found the issue but I still don't get it.Adding it. in the where clause solves the issue. Like this,
TimeOff.Where = "it.UserName=""" & grdSearch.SelectedValue & """"
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Dec 18, 2010
I have a checkbox and a panel inside of a FormView control, and I need to access them from the code behind in order to use the checkbox to determine whether or not the panel is visible. This is the code that I originally used, but since I put the controls inside of the FormView, it no longer works.
Protected Sub checkGenEd_CheckedChanged(ByVal sender As Object, _
ByVal e As System.EventArgs)
If checkGenEd.Checked = True Then
[Code]....
There aren't any errors anymore, but nothing happens when I click the checkbox. I think there needs to be some kind of event to trigger it but I don't know how you can put an event handler inside of an event handler.
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Apr 2, 2012
I have a FormView which I would like to open in insert mode only if the form contains no data. I've tried the following if statement:
If True Then
If SomeFormView.DataItemCount = 0 Then
SomeFormView.ChangeMode(FormViewMode.Insert)
[Code]....
but it opens in insert whether empty or not?
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Jul 18, 2009
Having:
<asp:FormView ID="frmEmployee" runat="server">
<EditTemplate>
<asp:TextBox ID="txtFirstName" runat="server" />
[code]....
is there a way to reference this control statically, without having to use FindControl?
VB.Net
txtFirstName.Text = "George"
C#
txtFirstName.Text = "George";
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Oct 18, 2011
I am using a Formview for Change Password funciton in my project. It works OK with update and validations.I am now trying to add code for Strong Password as follows:
Private Sub FormView1_ItemUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.FormViewUpdateEventArgs) Handles FormView1.ItemUpdating
Dim password As String = CType(FormView1.FindControl("PasswordTextBox"), TextBox).Text
Dim score As PasswordScore = PasswordAdvisor.CheckStrength(password)
[Code]...
In the class, the Match.Success always returns "False" and also, irrespective of the validity of the password entered, it gets updated in the database. Is there any way to control the Update function of Formview, so that the password is updated only if it is valid?
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Dec 28, 2010
I have a panel inside a formview that is supposed to become visible when a checkbox (also inside the formview) is checked. I am able to access the controls, but I'm not sure how to actually make it work. This is my codebehind so far, I know it's not right, but it gives a basic idea of what I'm trying to do.[code]
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Jun 7, 2011
Normally I've been lucky to find someone who has had the same problem and applied their solution but after hours of searching I'm not able to find a solution to this one. I've got a FormView which is default mode set to Insert. When the page is loading I'm checking to see if the session variable which the formview datasource is set to has a value. If it doesn't I've coded in the onLoad that some of the controls in the InsertTemplate would be set to specified value.
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Apr 18, 2009
Hello: i have javascript code for a popup calendar and works fine if a form is a form control:
<form id="FormView1" runat="server">
however, if i use my formview control w/ the same code for a formview control, it doesn't put the value back into my text box txtDate after the user selects the date:
<asp:FormView ID="FormView1" runat="server">
<asp:TextBox ID="txtDate" runat="server" TabIndex="3" Width="65px" ></asp:TextBox>
<a onmouseover="window.status ='Please Select Date';return true;"
onmouseout="window.status='';return true;"
href="javascript:show_calendar('FormView1.txtDate');">
<img alt="open calendar" src="images/SmallCalendar.gif"/></a>
this seems to be the only difference so i was wondering if perhaps i need to reference this form in a different way? i don't know why it won't work for my formview control.
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Aug 7, 2009
how to programically clear the data from a form view using vb.net. I have so far come up with the following:
Dim x
For x = 0 To Me.Controls.Count - 1
'if it is a text box then clear it
[Code].....
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