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


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

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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


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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'.


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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.

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


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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!

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

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)


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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.

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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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
End While


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

Feb 9, 2012

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


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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
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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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.


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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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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:


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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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"
Dim cmd As New SqlCeCommand("select * from TableStockTake", conn)
Dim reader As SqlCeDataReader
reader = cmd.ExecuteReader()


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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


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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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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


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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DB/Reporting :: Table Columns Into Table Adaptor?

Jul 7, 2011

Rather than running numerous queries in Access I am trying to write a front end for a DB2 database. The Access database is getting to a size that it is causing Access 2007 to have reliability issues and frequent compacting is required. I have created the Dataset, the Table Adaptors, and the Connection String already, but when I put in a bit of code in to fill the Table Adaptors the remote connection I have to work is going crazy (chewed up about 180MB before I realised it was pulling data from work).

Before I started the project I copied the .accdb to my local PC HDD and I pointed the connection string to it, but it still looks like it is trying to pull data from the work network. If it was a small database I wouldnt be concerned but it is pulling major data every time I run it. I have only 2 out of the 4 Table Adaptors running and it didnt fill them even after 10 minutes.

Here is the code I was trying to run... Server name has been substituted for Server for obvious work reasons.

Because the tables are so large I was looking for a way to pull only the columns I need to from the tables, I tried adding .SOFT_ID to the first line of code but the TA spat the dummy message below...

Value of type 'System.Data.DataColumn' cannot be converted to Application_Name.DS_DB2Database.Server_SOFTDataTable'.


I would also like to pull just the data columns I need to speed up the query.

Note: In case youre wondering why I am not connecting directly to the DB2 database. I currently dont know where it is stored and while leveraging Access I am trying to put a level of separation between the app and the db for the time being, later I will try connect directly.

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Filling The Datatable From Three Variable Or Putting The Three Table's Data Into One Variable And Then Producing The Data Table?

Jan 20, 2011

I have three table and I want to put the three table's data in one variable and from that variable i will produce the datatable and then want to write the data in CSV file.I am Following this step..



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Sql - Table Adaptor Error When Trying Update?

Jan 17, 2011

I have a rather perplexing issue. I am using VB.net and SQL for my project.I have a database, to which the connection works. I also have a data table and data adaptor, both of which I know work.I am trying to update something in the database, yet it isn't working. Assume everything listed is declared correctly. What am I doing wrong?

teacher_control_table.Rows(0)("DATA_TeacherLockPasscode") = txtPasscode1.Text

That last line throws the following exception:

InvalidOperationException was unhandled. update requires a valid UpdateCommand when passed DataRow collection with modified rows.

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Multiple Stored Procedures From 1 Table Adaptor

Jun 3, 2010

Can I use different stored procedures from 1 table adaptor that has all the stored procedures in it?

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VS 2008 Table Adaptor - Error Occurs When Adding Column To Query

Aug 10, 2009

I have a table adaptor that pulls from the sql database, when I edit the table adaptor query it makes this specific table adaptor not a part of the dataset. I have added a column to my database which will contain an integer, when I try to add this column to the query this error occurs, i am using the configure area of the table adaptor.
Error 'AuditProductsTableAdapter' is not a member of 'MemKingClient.MemKingDataSetTableAdapters.TableAdapterManager'.

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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.

char(4) -> String
varchar(50) -> String
tinyint -> Integer
char(1) -> Char
bit -> boolean


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