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?

View 2 Replies


ADVERTISEMENT

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

View 1 Replies

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

View 11 Replies

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].....

View 2 Replies

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]...

View 4 Replies

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]....

View 3 Replies

.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?

View 2 Replies

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 !

View 3 Replies

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.

View 2 Replies

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].....

View 2 Replies

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.

View 1 Replies

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]

View 1 Replies

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].....

View 3 Replies

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.

View 3 Replies

Invalid Cast Exception Was Unhandled - Unable To Cast Object Of Type 'System.String' To Type 'System.Windows.Forms.TextBox'

Feb 9, 2012

Private
Sub cmdExit_Click(ByVal
sender As System.Object,
ByVal e

[code]....

View 3 Replies

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?

View 2 Replies

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)

View 1 Replies

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]......

View 14 Replies

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...

View 5 Replies

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)?

View 1 Replies

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]...

View 4 Replies

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]...

View 4 Replies

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)

View 3 Replies

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.

View 1 Replies

Cause Of Invalid Operation Exception In Data Grid View For Process List Changed?

Feb 18, 2011

Moved from Microsoft Developer Network
> Forums Home >
Development Forums >
Windows Debugging

[Code].....

MS has a patch for the OnListChanged event handler issue, even though it seems we have to pay to have access to it. This fix specifically addresses an error message when you press ESC to cancel adding a new row in .NET 2.0: [URL]

FIX: Error message when you try to press ESC to cancel adding a new row to a DataGridView control in the .NET Framework 2.0: "An unhandled exception of type 'System.InvalidOperationException' occurred in System.Windows.Forms.dll"

View 3 Replies

.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]...

View 2 Replies

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].....

View 2 Replies

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].....

View 5 Replies

VS 2010 Analyze Two Textboxes And Highlight - Getting "invalid Argument Exception"?

Sep 10, 2011

I'm trying to make a program that will analyze two textboxes and highlight any words that don't match. Here's an example:

[Code]...

View 1 Replies

.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]......

View 2 Replies







Copyrights 2005-15 www.BigResource.com, All rights reserved