Unable To Cast Types
Apr 5, 2012Ran into this error message while trying to select some records off a table.[code]...
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Invalid Cast Exception Was Unhandled - Unable To Cast Object Of Type 'System.String' To Type 'System.Windows.Forms.TextBox'
Feb 9, 2012Private
Sub cmdExit_Click(ByVal
sender As System.Object,
ByVal e
[code]....
Insert Function - Object Cannot Be Cast From DBNull To Other Types
Nov 9, 2011I am having problems with my code, where I get the "Object cannot be cast from DBNull to other types" message when Insert(). I get the message on every Insert to this table, even though the data is successfully inserted. If I Update the same data after Insert(), it does so without error. I have checked my values and none of them are DBNull. Even when the same values are passed on Insert that are passed on Update.
My code is :
Private Sub Save()
Dim bo As tbl_GL
bo = New tbl_GL()
bo.ConnectionString = AppConfig.ConnectString
[Code] .....
Unable To Cast Object
Mar 9, 2012All I am trying to do is select one school id. Do you know where I went wrong? ty
Public Function findId(ByVal table_name As String, ByVal name As String)
Try
con.ConnectionString = connection_String
[Code]......
Unable To Cast Object?
Mar 24, 2011unable to cast object of type dataset to type datatable.Dim dataTable As DataTable = DirectCast(dataGrid.DataSource, DataTable)
View 4 RepliesUnable To Use GetType In Cast?
Dec 21, 2010The "GetType" method returns a type so why does VS flag the "DirectCast" statement as invalid?
Sub Main()
Dim d As C = New C
d.Value = 5
Dim o As Object = d
[code]....
Unable To Cast COM Object Of Type
Jul 24, 2011Is this code you have obtained from elsewhere? Have you tried debugging it line by line? Which line throws the error?
View 2 RepliesUnable To Cast HiddenField To I.Convertible?
Feb 10, 2012I have 2 DataLists where one is nested in the other one. I have one line (Dim QID....) that keeps giving me problems, no matter what combination of code I can find online. I just want to be able to get the Hidden Field to show up as an integer so that my If statement will work.
Dim dl2 As DataList = CType(e.Item.FindControl("DataList2"), DataList)
Dim QID As Integer = Convert.ToInt32(e.Item.FindControl("HiddenField2"))
If QID = 33 Then
[code].....
Unable To Cast Object Of Type
Jan 14, 2011I am new in programming with VS2008. Nowdays I try to built a simulation of graphics movement. I use Panel to draw the graphics but I faced a problem when I want to move the object. There were a message
"Unable to cast object of type 'System.EventArgs' to type 'System.Windows.Forms.PaintEventArgs'.".
Public Class Form1
Dim x, y As Integer
Dim n As Integer
Dim xp, yp As Integer
Dim xt, yt As Integer
[Code] .....
DB/Reporting :: Unable To Cast Object Error
Oct 7, 2008i am trying to create an sql parameter but i am having an error. it gives me an error like this: Unable to cast object of type 'System.Boolean' to type 'System.Data.SqlClient.SqlParameter'. on all of this line
Dim paramcollection As New List(Of SqlParameter) ' no error on this part but the lines below gives me an error:
paramcollection.Add(New SqlParameter("@CGLCode", SqlDbType.VarChar).Value =
[Code].....
Error : Unable To Cast COM Object Of Type
Jul 22, 2011I have do the coding to export the data from DataGridView to Excel. But If am running the code am getting the below error.
[Code]...
Getting Error Unable To Cast Object Of Type?
Aug 15, 2011I seem to have broken something I get this error Unable to cast object of type System.EventArgs' to type 'System.Windows.Forms.KeyPressEventArgs'.
my code:
Private Sub ListControl_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ListControl.SelectedIndexChanged
[code].....
GUID - Unable To Cast Object Of Type
Dec 16, 2009I want to do something like this:
Dim selectedCourses As List(Of Guid) =
From item In chkListCourses.Items Where item.Selected =
True Select item.Value
But I get the error:
Unable to cast object of type
'WhereSelectEnumerableIterator2[System.Object,System.Object]'
to type
'System.Collections.Generic.List1[System.Guid]'.
The value of item is a string representation of a Guid. I'd also like the syntax for a Lambda expression.
Unable To Cast Object Of Type Error
Mar 28, 2011i write this code to work with some radio button and calculate Score for a questionare : Dim SScore AsByte = 0 Dim BTNN AsByte = 0 Dim BTNNS AsString = "" ForEach rBTN AsRadioButtonInMe.Controls If Mid(rBTN.Name, 1, 5) = "RBS01"Then If rBTN.Checked Then SScore = SScore + CType(Mid(rBTN.Name, 7, 1), Byte) EndIf EndIf Next I get this error on line 4 : Unable to cast object of type 'System.Windows.Forms.Button' to type 'System.Windows.Forms.RadioButton'. i dont know what is it and how can handle it.
View 5 RepliesUnable To Cast Panel Object To IEnumerator
Apr 28, 2009Unable to cast object of type 'Panel1' to type
[Code]...
LinqToObject Query Unable To Cast Object Of Type?
Jul 29, 2011Why is this query not working
Private mapOverlays As New List(Of GMapOverlay)
Dim mapOverlay = mapOverlays.Where(Function(x) x.Id = overlay.Name).Distinct()
DirectCast(mapOverlay,GMapOverlay).IsVisibile = False
I am getting the error
Unable to cast object of type
'd__7a`1[GMap.NET.WindowsForms.GMapOverlay]' to type
'GMap.NET.WindowsForms.GMapOverlay'.
Listview - Unable To Cast Custom Listviewitem Class In .net?
Apr 29, 2011I'm trying to use a custom listviewitem class that attaches additional information to a lisview item. Here is the class:
Public Class albumListViewItem
Inherits ListViewItem
Public hash As String
[code]....
When I try to cast a listviewitem to my custom class like this:
Dim albumItem As albumListViewItem = CType(lsvHidden.items.item(0), albumListViewItem)
I get the following error, "Unable to cast object of type 'System.Windows.Forms.ListViewItem' to type 'AudioMatic.albumListViewItem'."
Serializing Data - Unable To Cast COM Object Of Type
Feb 4, 2010I'm having a real problem with serializing data. I understand that its designed to basically copy the structure and data of a structure. In my case, I have the state of a DVD that i would like to save (persist) to disk. [Code] error: 'Error Generating XML', Inner Exception: "Unable to cast COM object of type 'System.ComObject' to class type 'DirectShowLib.DVDState'.
COM components that enter the CLR and do not support IProvideClassInfo or that do not have any interop assembly registered will be wrapped in the ComObject type. Instances of this type cannot be cast to any other class; however they can be cast to interfaces as long as the underlying COM component supports QueryInterface calls for the IID of the interface."
Unable To Cast From List(of Object) To IList(of Interface)?
Apr 19, 2011I'm new to generics and am having some issues when using with interfaces.I'm developing with VS2008 - .NET 3.5 Ultimately, I'd like to create an interface that inherits the IList(Of T) interface and add a function definition to the derived interface that adds a new element of type T to the list and returns the index of the newly added item.
I have everything figured out but am stuck on a casting issue. If I execute the following line of code at runtime:CType(New clsObjectFactoryList(Of clsIDNamePair), ifObjectFactoryList(Of ifIDNamePair))
ASP.NET Page Change Causes An Object Array In Session To Be Unable To Cast To It's Own Type?
Nov 11, 2009I am storing an array of a custom serializable class in session on my site. When a page on the site changes, suddenly it renders them invalid, and tells me that it can't cast the type to it's own type. I assume the class version numbers are changing or something?!
I'm not trying to redesign this whole process.
Unable to cast object of type 'ShipmentPackages[]' to type 'ShipmentPackages[]'.
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.InvalidCastException: Unable to cast object of type 'ShipmentPackages[]' to type 'ShipmentPackages[]'.
[Code].....
Unable To Cast Object Of Type System.Windows.Forms.MenuStrip
Jun 12, 2011I have a form contain 10 checkbox. how to count total checkboxes that has been checked? i search over the internet but not found any solution. please help me. i found a code, but when i apply it on my project it says "Unable to cast object of type System.Windows.Forms.MenuStrip' to type Component Factory. Krypton.Toolkit.KryptonCheckBox'".i think i have problems with Me.Controls(on the code)[code]
View 3 RepliesDeleting A File Using A Checked List Box - Error: Unable To Cast Object Of Type
Jun 21, 2010I am trying to delete a file(s) from a checked list box, when i click a button.
This is the code i have:
Dim item As IO.FileInfo
For Each item In CheckedListBox1.CheckedItems
Try
item.Delete()
Catch : End Try
Next item
But i get the error: Unable to cast object of type 'System.String' to type 'System.IO.FileInfo'.
Cast Value Type To Nullable Enumeration Type In Generic Object If All Types Are Unknown At Write-time?
Dec 14, 2011I have a generic Class I'm using to hold information loaded from a database.I have a method which takes a DataRow as an argument, uses the object's known column name and extracts the data from the DataRow, such that:Dim loadData As T = CType(myDataRow("myColumnName"), T))works as my default assignment in most cases.Unfortunately, due to some horrifying design constraints, some of my columns may be null, and may also be taken from enumerations.This means that when <T> is Nullable(Of SomeEnumeration) the above code does not work because I can't cast 0 directly to SomeEnumeration.Zero.Is there some way to check whether <T> is Nullable(Of [Enum])? Or some way to write a method which allows Integers to be cast to Nullable(Of [Enum])?I feel like I'm forgetting something that would allow me to write one of the other of these, but my weak google-fu is turning up nothing.
EDIT: Okay, thanks to dasblinkenlight's answer below, I can detect when this circumstance is occurring, but what I need to do now is to take a type <T> which I know is Nullable(Of SomeClass), get a type reference to SomeClass and then create a new object of type Nullable(Of SomeClass) and assign that to LoadData.My problem was that I had a lot of difficulty in finding any function which would accept baseType as an actual Type.Parse accepted baseType as a parameter, I knew baseType was an [Enum] type because of dasblinkenlight's code, so I was, in this instance, able to code a solution. It's a solution which is very specific to my problem (i.e., T is Nullable(of SomeEnumeration)), but it's a solution nonetheless.
Troubleshoot "Object Cannot Be Cast From DBNull To Other Types."?
May 1, 2009how can I troubleshoot "Object cannot be cast from DBNull to other types."?I am using a combobox, to retrieve the price and discount price of the service, If I select an item in combobox3 once, error will not occur, but if I select a item again in combobox3, "Object cannot be cast from DBNull to other types." will occur..here is my code
Private Sub ComboBox3_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox3.SelectedIndexChanged
Dim ds As New DataSet
[code]....
VS 2008 Error - Unable To Cast Object Of Type 'System.Windows.Forms.MouseEventArgs'
Nov 7, 2009When executing this code I get this error:
Unable to cast object of type 'System.Windows.Forms.MouseEventArgs' to type 'System.Windows.Forms.DataGridViewCellMouseEventArgs'.
Private Sub NoteGrid_CellContentClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles NoteGrid.CellContentClick
Try
[code]....
"Object Cannot Be Cast From DBNull To Other Types."?
Jun 20, 2012how can I troubleshoot "Object cannot be cast from DBNull to other types."?I am using a combobox, to retrieve the price and discount price of the service, If I select an item in combobox3 once, error will not occur, but if I select a item again in combobox3, "Object cannot be cast from DBNull to other types." will occur..
here is my code
Private Sub ComboBox3_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox3.SelectedIndexChanged
[code].....
Unable To Load One Or More Of The Requested Types - Retrieve The LoaderExceptions Property For More Information
Nov 23, 2009Does anyone know what the problem is with this error message? One or more errors encountered while loading the designer. The errors are listed below. Some errors can be fixed by rebuilding your project, while others may require code changes. Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
View 2 RepliesAsp.net - Unable To Cast Object Of Type 'ASP.webform1_aspx' To Type 'System.Web.UI.WebControls.Button'
Jan 28, 2012when view in browser, i got this error: Unable to cast object of type 'ASP.webform1_aspx' to type 'System.Web.UI.WebControls.Button'.
how should i solve this problem?
Line 7: If Not Page.IsPostBack Then
Line 8: Dim rowIndex As Integer = 0
<b>Line 9: Dim btn As Button = DirectCast(sender, Button)</b>
[Code].....
Unable To Cast Object Of Type 'ADODB.InternalField' To Type 'System.String
Apr 19, 2010I had write code (just for learning), the codes :
dim Temp as string
Temp = Recordset("
Table_Field")
but, when I start Debugging the error messages "Unable to cast object of type 'ADODB.InternalField' to type 'System.String"
Unable To Cast Object Of Type 'IMAPI2FS.FsiStreamClass' To Type 'IMAPI2.IStream'
Apr 13, 2011I am implementing IMAPI2 into my vb.net project but ran into a wall. I am getting the message Unable to cast object of type 'IMAPI2FS.FsiStreamClass' to type 'IMAPI2.IStream' when trying to start the burn. I googled around and found this is something that microsoft hasn't fixed.. which basically renders IMAPI2 useless in vb.net.
I found a post on codeproject.com by eric hadden who combined the IMAPI2.dll and IMAPI2fs.dll into an c# interop file. I also see the IBURN interop in microsoft SDK samples. I'd like to use either, but it's in c# and I'm using vb express. Does anyone know a way to get the interop into visual basic or a way around "Unable to cast object of type 'IMAPI2FS.FsiStreamClass' to type 'IMAPI2.IStream'"?