Invalid Cast Exception When Assigning A String?

Jan 23, 2011

Dim NSNSRC As String = WebBrowser1.DocumentText
 
This throws me an error although DocumentText does have a value, I have also tried a .tostring after and it still did not work.
 
Surrounding Code:

While DocCompleated = False
System.Threading.Thread.Sleep(0)
End While

[Code].....

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Invalid Cast Exception When Assigning A Parent To A Child Type?

Nov 2, 2009

I've created a class that inherits from Dictionary(Of TKey, TValue) called KeyCopyDictionary(Of TKey, TValue). I'm now trying to use a pre-existing function which returns a Dictionary(Of String, String) and assigning it to a variable of type KeyCopyDictionary(Of String, String). I'm getting an invalid cast exception. Is it not possible to assign a variable of a parent type to a variable of its child type? I've tried DirectCast and CType to no avail on this...

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Get An Invalid Cast Exception - Conversion From String To Double Not Allowed?

Apr 27, 2010

I get an Invalid Cast Exception - Conversion from string to double not allowed. I don't know what to do.

Option
Strict
On[code]......

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String To String Invalid Cast Exception?

Nov 28, 2009

I have the following code and I'm getting tons of Invalid cast Execptions This is for VB 2008 Case Study Auto Center ( Car Wash)

Imports System Imports System.Drawing Public Class frmMain

[Code]...

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Invalid Cast Exception?

Feb 16, 2011

see from the following function why I would be getting an "Invalid Cast Exception"? More specifically this is the error "Conversion from string "yyyyMMdd" to type 'Integer' is not valid." I am trying to convert a DateTime value from the database to a String with the format "yyyyMMdd" so for example October 22, 1985 would be "19851022".dbReader(fieldName).ToString("yyyyMMdd")Here is the entire function ...

Private Function GetDBReaderDateValue(ByVal dbReader As IDataReader, ByVal fieldName As String) As String
If dbReader(fieldName) Is DBNull.Value Then

[code].....

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Invalid Cast Exception On Same Type?

Apr 15, 2012

i know this may seam odd but I'm getting an error navigating through a datagrid of an invalid cast. The trouble is it is of the same types!! I working on customising some Sage code and in the form there is a datagrid that is populated by a series of Sage.Accounting.Stock.TraceableSOPAllocationItems (a batched stock item allocated to an SOP).

I want to give the user some further information on each item so they can decide which batch and bin to use. I want to go through each item in the grid and then go find this extra information for it. the trouble is when I go to navigate through, My VB.Net code throws the error.InvalidCastException was unhandled by user code, Unable to cast object of type 'Sage.Accounting.Stock.TraceableSOPAllocationItem' to type 'Sage.Accounting.Stock.TraceableSOPAllocationItem'.

[Code]...

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Multiple Invalid Cast Exception For One Try?

Mar 9, 2010

I need to use two Invalid Cast Exceptions on one try. I need to to appear when txtNight or when txtRate has an invalid value.

Try
decCharges = CDec(txtRate.Text) * CDec(txtNight.Text)
lblCharges.Text = decCharges.ToString("n")

[code]....

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.net Dynamic Loading - Getting Invalid Cast Exception?

Jan 6, 2011

I've seen some other responses about this and they talk about interfaces but I'm pretty sure you can do this with classes and base classes but I can't this to work.[code]....When it tries to convert whatever Activator.CreateInstance(t) returns to the base class of type Behavior I'm getting invalid cast exception. That type should be of CharacterController which is defined as a child of Behavior so why wouldn't it let me cast that?

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Error : Invalid Cast Exception Was Unhandled

Aug 15, 2011

I am getting  Invalid Cast Exception was unhandled.Conversion from String 'abc' to type 'Double' is not valid in the following line!

If
((xlBook.Worksheets(2).Cells(iRowIndex, iColumnIndex).Value)) = avFoundKeywordds(iSearchText)
Then 

The business intent is that user enters the keyword 'abc' and clicks search button . We have defined different keywords in a xls which has 1600 rows and 16 columns . so when finding abc in any of the cells ,it has to return the value of a column#4 where the name is specified !

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Getting Invalid Cast Exception When I Create Proxy

Feb 24, 2011

I am trying to create the Proxy from the WSDL using wsewsdl2.exe [code]...

But i am getting Invalid cast exeption.Can someone please tell me how to i fix it?

I am using VS.net 2003 with WSE 2.0 V3 and Soap 1.1 installed.

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Invalid Cast Exception (Retrieving Image)?

Mar 12, 2011

i save image into a database correctly and now when it come to retrieving i get an error message when the photograph column is NULL.Is there any way i can check if it is null then i execute different code else it return the image.This is what i am using for now

Dim barrImg() As Byte
Dim cmdSelect As New SqlCommand("select Photograph from Personal where MyID=@ID", connect)

[Code].....

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Invalid Cast Exception Was Unhandled In LINQ To SQL?

Feb 22, 2012

Here's my [code...]

On this line "db.jobs2surveys.DeleteOnSubmit(deleteJob2Survey)" I'm getting the following error.
[code...]

What exactly does this error mean and how can I fix this? I can't find much info on Google.

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Invalid Cast Exception Was Unhandled Warning

Jul 18, 2011

We are trying to implement a logic which we used in vb6 2 years back.User enters a business requirement in text box, we define the keywors in the script and once the button is clicked , it shld luk from the list and display a msgbox of number of keywrods found.

1. Invalid Cast Exception was unhandled error -->Warnings

2.When casting from a number , the value must be a number less than infinity -->Warnings

3.When trying to declare ,variant is not accepting and its converting it into Variant Type. Are these both same?[code]

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VS 2008 - Invalid Cast Exception Was Unhandled

Aug 13, 2009

I have declared two variables as strings strDob and strCurrentDate, Both Variables are for storing dates. StrDob is for storing Date of Birth and second is for Present date. and am executing the following code

If DateValue(strDOB) > DateValue(Date.Today) Then
and getting the error like
Invalid CastException was unhandled
Conversion from string "19/09/1987" to type 'Date' is not valid.

Error in the following code also:
iAge = (CInt(Abs(DateDiff("d", strCurrentDate, strDOB)) / 365))
Invalid CastException was unhandled
Argument 'Date1' cannot be converted to type 'Date'.
Here I need both variables as string itself. because the Dateofbirth is getting from three comboboxes.

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Invalid Cast Exception - Storing Textbox Value In Brackets

Aug 7, 2009

textbox1.text = "6916092, 15195440, 16107657, 1836924, 3758726, 12566463, 7526079, 7405793, 6945974, 241502, 2296476, 5130294, 3102017, 7324121, 14993507"
ColorDialog1.CustomColors = New Integer() {TextBox1.Text}
I am getting an InvalidCastException. How do I insert the value of textbox1.text into those brackets in vb.net?

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Invalid Cast Exception, Storing Colordialog Value In Textbox?

Aug 7, 2009

why do i get an error here?TextBox1.Text = TextBox1.Text & Str(ColorDialog1.Color)

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VS 2010 - Masked Textbox (Invalid Cast Exception)

Oct 10, 2011

I've got a masked text box that throws an invalid cast exception if I try to put anything in the TextChanged event:
Private Sub mtbZVal_TextChanged(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MaskInputRejectedEventArgs) Handles mtbZVal.TextChanged
MsgBox("OK!")
End Sub

Even more oddly, it throws the exception in a completely different part of the program. The masked textbox is on a form that opens when you press a button, and that's the bit that gives the error:
Private Sub cmdAddLoc_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdAddLoc.Click
If frmLocation.ShowDialog() = DialogResult.OK Then
End If
End Sub

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VS 2010 Datetime.tostring Invalid Cast Exception?

Nov 21, 2011

I'm just converting a date to a string but I'm getting this error. It's not listed as one of the normal exceptions to the datetime.tostring method. Googling around, it looks like it's an actual bug where it thinks StartDate is an int--but that's no help to me, as I just need to convert the date.

dim StartDate as nullable(of date)
dim Date1 as string
if not StartDate is nothing then
Date1 = StartDate.tostring("yyyy-mm-dd")
end if

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Sql - Invalid Cast Exception When Filling Datatable Wth Table Adaptor

Jan 13, 2011

I am using VB.NET 2010 (Visual Basic 2010 Express) on a WPF-based project. I am also using the SQL Server Express built-in to Visual Basic 2010 express.I have just about finished refining my code for hooking up my wpf-based form to an existing SQL database (agentroster.sdf). I have a global data source (AGENT_ROSTER) connected to this database. Connections are confirmed to work properly.This is the first part of the code I'm using, irrelevant code omitted,

Dim table_adaptor As New AGENT_ROSTERTableAdaptors.AGENT_ROSTERTableAdaptor
Dim roster_table As New DataTable("roster_table")
Dim rowposition As Integer

[code]....

how do I fill roster_table with table_adaptor (or alternate method)?

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VS 2010 Data Bindings - Invalid Cast Exception With DBNulls

Sep 8, 2011

I'm binding a ComboBox's SelectedIndex to a Nullable database field like so:

VB.NET

ColapsoComboBox.DataBindings.Add("SelectedIndex", EnsaiosBindingSource, "Colapso", False, DataSourceUpdateMode.OnValidation, 0)

As you can see, I've defined the NullValue to be zero, yet I get an InvalidCastException. Is there anything I'm doing wrong? Or is handling the binding's Format and Parse events the only way around this?

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Card Game - "Invalid Cast Exception Was Unhandled" "Conversion From String "" To Type 'Double' Is Not Valid

Aug 12, 2010

I'm trying to make a card game where the user chooses either Clubs, Hearts, Spades, Diamonds or Joker and then the computer randomly chooses a card to counter and then depending on the formula of what beats what the scores are tallied.

Here is the:

Public Class Form1

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

[CODE]...

Now I pick a card and the computer picks a card and it displays the winner but then immediately it sends me to the coding highlighting lblcomp.text += Val(0.5,1, or 4) saying "Invalid Cast Exception was Unhandled" "Conversion from string "" to type 'Double' is not valid.

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Reader.getDateTime(2) Throw Exception "Invalid Cast"?

May 30, 2011

I have below program that throw exception. Do you know how to fix??

Dim conn As New SqlCeConnection

conn.ConnectionString = "Data Source=" & Dir & StockTakeFile & ";Persist Security Info=False"
conn.Open()
Dim cmd As New SqlCeCommand("select * from TableStockTake", conn)
Dim reader As SqlCeDataReader
reader = cmd.ExecuteReader()

[Code]...

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WMI Network, VB 2008 Gets Invalid Function/invalid Cast Type

Jul 15, 2009

I'm using WMI code and VB 2008 to see NIC status. So far the queries are working, but the methods aren't. For example, I'm trying to set a network card to use DHCP, I get invalid function with this code:

Dim classInstance As New ManagementObject("rootCIMV2", "Win32_NetworkAdapterConfiguration.Index='7'", Nothing)
Dim outParams As ManagementBaseObject = classInstance.InvokeMethod("EnableDHCP", Nothing, Nothing)

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'Unhandled Exception: Cast From String "click" To Type 'integer' Is Not Valid?

Apr 28, 2010

VB 2003 Combobox collection from -3 to +3 The goal of the message is to warn the user that the systems only covers +- 3 timezones, if he types in for example +4 or -4, he gets the message (by the way: how to protect the system if he types for instance a character?)

When I run the application: 'Unhandled exception: Cast from string "click" to type 'integer' is not valid

Private Sub ComboBox1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ComboBox1.TextChanged

[Code]...

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'Unhandled Exception: Cast From String "click" To Type 'integer' Is Not Valid - Combobox

Apr 28, 2010

Combobox collection from -3 to +3 The goal of the message is to warn the user that the systems only covers +- 3 timezones, if he types in for example +4 or -4, he gets the message (by the way: how to protect the system if he types for instance a character?)

When I run the application: 'Unhandled exception: Cast from string "click" to type 'integer' is not valid

Private
Sub ComboBox1_TextChanged(ByVal
sender As
Object,
ByVal e
As System.EventArgs)

[Code]...

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.net - LINQ To SQL Invalid Cast?

Sep 3, 2010

I'm getting an invalid cast exception but I'm not sure why, here is the list of my conversions.

SQL -> VB.NET
char(4) -> String
varchar(50) -> String
tinyint -> Integer
char(1) -> Char
bit -> boolean

[Code]...

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Invalid Cast Expression?

May 29, 2012

How do I get rid of invalid cast expression from the Values in the Combobox to fit in the equation in examgrade? I tried to resolve it by looking it up on MSDN, and the like but couldnt figure it out.I tried using Examgrade = ().ToString but that did not work.FYI this is my first real program, I successfully made this once in C# but deleted the source files, so this is Visual Basic and a hell of a lot easier to get this far.The asterisks mark the problem line

Public Class Calculator
Dim quarter3 As Integer
Dim quarter4 As Integer[code].....

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Invalid Cast While Using Inherited Classes?

Jul 28, 2010

I create an application in both C#.NET and VB.NET

When I inherit a C# class in VB I want to be able to set an instance of the VB class  to be equal to that from a C# instance.

public
class
SomeClass

[Code].....

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.net - Why Have Equals Methods Have All Started Throwing Invalid Cast Exceptions

Mar 5, 2010

Several of my overriden Equals methods have started throwing Invalid Cast Exceptions -

Unable to cast object of type 'System.DBNull' to type Common.ResolveUser'.

This occurs when binding List (of T) (where T is of type ResolveUser in this case) to a combo.

Equals Method:

Public Overrides Function Equals(ByVal obj As Object) As Boolean
Dim i As ResolveUser = CType(obj, ResolveUser)
If i.UniqueResolveID = UniqueResolveID Then Return True

[Code]......

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LINQ Return Single Type Of Object Invalid Cast

Jun 29, 2010

Ok, just needing a 2nd set of eyes looking at this to make sure the error isn't something else other than my LINQ code here.  Here's the function class itself:

Public Function GetJacketByPolicyID(ByVal jacketID As Int32) As tblPolicy
Dim db As New DEVDataContext()
Dim j As tblPolicy = db.tblPolicies.Single(Function(p) p.policyNumber = jacketID)
Return j
End Function

and here is the code which calls this class function in the web control form itself:

Dim p As tblPolicy
Dim j As New Jackets()
p = j.GetJacketByPolicyID(3000050)

For some reason it's flagging the 2nd line in the GetJacketByPolicyID function saying the specified cast is not valid.  So I'm guessing it's something I'm doing wrong.  I'm sure the tblPolicy/tblPolicies class works right since I can create a new instance of a tblPolicy and set a few variables by hand and return it, so that's not it.  I've also checked the datarow I'm fetching and there's no null values in the record, so that shouldn't be it either.

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Unable To Cast Object Of Type 'System.String' To Type 'System.IFormatProvider' Exception

Aug 7, 2011

When testing the followng code from Mastering VB2010, I get an Unable to cast object of type 'System.String' to type 'System.IFormatProvider' exception.In the Button1_Click event code Dim strmOut As New System.IO.StringWriter(SaveFileDialog1.FileName)the 'SaveFileDialog1. FileName' is underlined with a green squiggle and displays the following tool tip:Runtime errors might occur when converting 'String' to'System. Iformat Provider'.This is apparrently the problem but what does it mean and how do I fix it to get the code to work? 'Code being tested that runs the exception:Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click.[code]

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.net - Linq To SQL Cast Exception?

Sep 9, 2010

I am trying to Delete an entity but am having trouble with an InvalidCastException. The debugger breaks at the Next statement in the ForEach loop.My entity class is called Material.

Dim materialsTable As Table(Of Material) _
= (New DataContext("Server=.SQLEXPRESS; Database=Materials; Trusted_Connection=yes;") _
.GetTable(Of Material)())

[code]....

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Invalid Operation Exception?

Apr 16, 2007

have a form onto which i've place a menu item called Exit. When I click the Exit, i expect it to close the entire application.Here is the code

Private Sub mnuExitApp_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuExitApp.Click
Application.Exit()

[code].....

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VS 2005 Error Handling Cast Exception?

Jul 24, 2009

I have most of the obvious user error handled with code, limits to mubers on keypress, if statement in case of input blank left blank etc.. I realize though that are infinintepossibliltys the user can perform especially with the programI am trying to create it requires ALOT of user interaction, with users inputting information (numbers in textboxes) and calculations happen on the fly, in other words there is no Calculate button after everything is input

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Invalid Operation Exception - Only On Other Machines?

Feb 15, 2011

I have an application that I've tested on multiple machines. It runs perfectly on the development machine, but no others. I have itextsharp.dll included and registered in the installer (I used NSIS). On one of the other machines, this was retrieved from the system log:

Application: Evaluation creator.exe Framework Version: v4.0.30319

Description: The process was terminated due to an unhandled exception.

Exception Info: System.InvalidOperationException

[Code]...

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Invalid Operation Exception Was Unhandled

Aug 9, 2010

please i have this exception in my project which i do not know how to solve it.The problem i think is not from my codes but it is from a tool box item i am using which is giving me that error if i delete that tool box item from my form this exception is not thrown.The item name is GrFingerXctrl class. This item will enable me to integrate a biometric fingerprint reader in my application.it is from an SDK i downloaded from [URL].

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Invalid Parameter: Name Handle Exception

Nov 23, 2009

I am using VB.Net code to print barcode label in Zebra TLP 2844 printer. And the printer is connected to system by USB port. When i execute the code i get an error "Invalid Parameter : Name handle" in the line outFile = New FileStream(_SafeFileHandle, FileAccess.Write) . As this is a USB port So i shared the printer and used the UNC path. But still i get the error. Below is the complete code

[Code]....

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Error Is: Invalid Operation Exception Was Unhandled

Feb 6, 2010

i have a datagridview that show an access database also there is toolstrip menu i defined the datasource and everything is fine except that when i run the application and edit anything and when i press the save button on the toolstrip an error appear and highlight this: Me.TableAdapterManager.UpdateAll(Me.My_phone_numbersDataSet)

and the error is: invalid operation exception was unhandled

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Invalid Column Name 'LastEditDate' - SqlClient Exception?

Nov 16, 2009

I am getting an exception and I don't know how to remedy it. The history is that, in my inexperience, I had asked for the creation of an ODBC data source using a remote SQL Server, and specified caching of certain tables.Then I noticed that this was getting complicated and I tried to not have those tables cached.Columns like 'LastEditDate' had gotten added to those tables.I abandoned using ODBC and went with SqlClient instead. I started getting the error described below re "Invalid column name 'LastEditDate'" even though I never refer to or use such a column. I searched my computer for files containing this string and deleted them. The error kept occurring. I removed all the columns called 'LastEditDate' from the SQL Server database. The error kept occurring. I started my Visual Basic.Net 2008 project over with a different name.The error still keeps occurring.Fragment from a class (form) containing a sub called SyRefresh:

                    Case "STOCKDATA"
                        sCell = sData.Split(",")[code].....
  
dc is a datacontext associated with a SQL Server instance on a server somewhere on the Internet.That remote SQL Server is version 2000. As you can see above, I use Linq.

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Invalid Operation Exception Enumeration May Not Execute

Feb 16, 2011

I have a dataset returned after executing a sql query. below is my code to access the returned dataset and I seem to get this error sometimes and not all the time this code executes
Private Sub Timer1_Elapsed(ByVal sender As Object, ByVal e As System.Timers.ElapsedEventArgs) Handles Timer1.Elapsed
Dim currentMethod As String = MethodBase.GetCurrentMethod.Name

[Code].....

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VS 2008 COM Exception Error: Invalid Parameter

Dec 10, 2009

I am running the same program on two workstations. One reveals no errors while the other shows a "COM exception error: invalid parameter." The offending line of code is shown below.Is there an explanation for the inconsistency?

.SeriesCollection(iRet).Name = "=""Q" & Str(iRet) & """"

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XML.Save Fails With 'invalid Character' Exception

Sep 16, 2009

I'm performing an XML.save(filename), but when an invalid character is present, it fails with this error:{"'', hexadecimal value 0x07, is an invalid character."} [code]I've tried playing around with the XML encoding but nothing seems to help.I need to have this data saved, even though its a bunch of odd characters.

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Subsonic Invalid Cast From System.Int32 To System.Byte[]

Feb 22, 2010

Subsonic 2.2 is throwing the error

subsonic Invalid cast from System.Int32 to System.Byte[]

When I do the following

If template.Content Is Nothing Then
MsgBox("Blank Document")
Else
MsgBox("Document Present")
End If

"template" is a SubSonic object of which it's "content" field is of type Byte()

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[2008] Cast Bindingsource.current To Datarow Throwing Exception?

Jan 14, 2009

im dr As DataRow = CType(Me.ProductBindingSource.Current, DataRowView).Rowbut I get the error saying:

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