Conversion From Type '_ComObject' To Type 'String' Is Not Valid?

Jan 7, 2009

i got following error while i am running my program here is the code scratch where i got an exception :

Try
Dim de As New DirectoryEntry("LDAP://xxx/dc=xxx,dc=com", "aaa", "secret")
Dim MyAttributes As PropertyCollection
Dim MyAttributeName As String
Dim myValue As String

[Code]...

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Conversion From String "System._ComObject" To Type "double" Not Valid To AutoCad

Feb 9, 2011

I am trying to count Acad Blocks and then write the block references to the modelview using vb.net (VB 2010 Express).I have been scanning the forums for the error I am getting and before I post the code, I thought I would check and see if anyone is experienced with AutoCad and would be able to give some insight.  Have not found much to do with AutoCad on the forums as of yet.I have comments on the debugging process, that might help out somewhat but I can't figure out where the first value is not being assigned (or better yet why).

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DB/Reporting :: Conversion From Type DBnull To Type String Is Not Valid When Inserting A Record

Mar 22, 2010

I'm trying to add a new record to my database but i keep getting the message - "conversion from type DBnull to type string is not valid". I think its something to do with the Employee ID when VB attempts to save it to the database my code is below

Imports System.Data.OleDb
Public Class Add
Private Sub DisplayRow()

[Code]....

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Error: Microsoft.VisualBasic: Conversion From Type 'DataRowView' To Type 'String' Is Not Valid

May 25, 2011

I now have SQL Parameters set up and I'm using them to save/delete/add my data. This all works well, except when it's trying to save a combobox to the datatable it appears with the error above.Majority of my comboboxes have datasources, and the valuemembers of these are the actual list items, not the ID's of the list items.I'm not sure why this error could be happening, I'm fairly sure I've connected everything to the binding source correctly; I've checked it a few times.Does anybody know what the cause of this could be? I've looked around a bit and I haven't found much

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IDE :: System.InvalidCastException: Conversion From Type 'DBNull' To Type 'String' Is Not Valid

May 16, 2007

I have these errors when creating my website?

Error 1Server Error in '/ Application. -------------------------------------------------------------------------------- Conversion from type 'DBNull' to type 'String' is not valid. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidCastException: Conversion from type 'DBNull' to type 'String' is not valid. Source Error: Line 64:
Line 65:

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VS 2008 : Error: Conversion From Type 'DBNull' To Type 'String' Is Not Valid

Jun 15, 2009

how can I solve this error without having to fill all of my fields. Some of the fields in my database are Nulls and some have records.

Error: Conversion from type 'DBNull' to type 'String' is not valid.

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Error : Conversion From Type 'DataGridViewTextBoxCell' To Type 'String' Is Not Valid

May 2, 2010

I am getting the error "Conversion from type 'DataGridViewTextBoxCell' to type 'String' is not valid." When trying to display a cell from DGV in a listbox.I have my variable for the cell reference as follows:

Dim a As Object
a = DataGridView1(4,1)

To insert it in the listbox as follows:

lstLetter.Items.Add(String.Format(a))

I tried:

lstLetter.Items.Add(a)

This will not actually display the entry inside the referenced cell, it shows this in my listbox instead:

DataGridView TextBoxCell { ColumnIndex=4, RowIndex=1 }

how I need to convert this to display.

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Error: Conversion From Type DBNull To Type String Is Not Valid

Jul 29, 2011

I was tried to get quantity from db make use of the selection in list box. I got answered with listbox1. If i selected the item in listbox1 the quantity would appear in textbox1. But in this same code will not work for listbox2 with textbox4.. Here i given the code...

$Con.open()
$Dim cd as new oledb.oledbcommand("Select Quantity from tlist where tool_name"& "'"listbox2.selecteditem & "'" & "", con)

[Code]....

Here i got the error as "Conversion from type DBNull to type string is not valid"

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Error:Conversion From Type 'DBNull' To Type 'String' Is Not Valid

Dec 13, 2010

I've been getting this error when pulling data from a recordset. It is coming from a null entry and as a newbie to VB2008 I'm not sure how to get around this.

here is my code lblShipping.Text = reader("CARRIERCODE")

the error:Conversion from type 'DBNull' to type 'String' is not valid. Basically what i'm attempting to accomplish is to see if there is anything in that field. If so put it into the text box if not leave it blank.

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VS 2008 - Conversion From Type 'InternalField' To Type 'String' Is Not Valid

Jul 9, 2009

We get this error: Conversion from type 'InternalField' to type 'String' is not valid. When we get to this in our Dim fname2 = fname args.Graphics.DrawString(fname2, New Font("arial", 8), Brushes.Black, 5, 5) fname is a nvarchar variable from a recordset. It's just a name.

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VS 2008 : Conversion From Type 'DBNull' To Type 'String' Is Not Valid

Jan 20, 2010

I use following codes to retrieve data from table, but get error Conversion from type 'DBNull' to type 'String' is not valid.

str = "Select * from gpass where vou_no= " & Val(Me.txtGat.Text) & " And Date = '" & Me.txtDat.Text & "'"
dt = GetTable(str)
If (dt.Rows.Count > 0) Then

[code]....

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VS 2008 Conversion From Type 'DBNull' To Type 'String' Is Not Valid?

Apr 29, 2009

I am importing an Excel spreadsheet, turning it into a dataset and inserting the results into SQL Server (only 100 rows).

I am having an issue with one of the date columns in Excel, which can have a value or not. The "F" column is the one that may be blank and this is the error I get: Conversion from type 'DBNull' to type 'String' is not valid.

How can I add a check to the Dim F As Date = CDate(row(5)) to handle a null?

VB
' The use of letters instead of
' more descriptive variables is
' strictly for this sample peice

[Code].....

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VS 2010 Conversion From Type 'FileInfo' To Type 'String' Is Not Valid?

May 1, 2012

I get the error: Conversion from type 'FileInfo' to type 'String' is not valid. This happens in between try and end try

Private Sub CopyNotes()
Dim NotesBase As String
Dim NotesTgt As String

[Code].....

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VS 2010 Conversion From Type 'Range' To Type 'String' Not Valid

Aug 30, 2011

I have the following code to use Words spellcheck feature on a RTB. Once you pick the correct word in the spellcheck box and press change I get the error on th efollwoing line

strResult = Left(objDoc.Content, Len(objDoc.Content) - 1)

I tried to use CType() but still complains.

If (Len(t.Text) = 0) Then
'nahhhhhhhhhhh
Else

[Code]....

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'Conversion From Type 'DBNull' To Type 'String' Is Not Valid

Aug 19, 2009

At run time my application gives an error of "Conversion from type "DBNull" to type "String" is not valid. In my form only one field - Add_info is an optional field which might be filled or not by the user. Before, I had an error when an apostrophe was used so i updated the code as highlighted below. This in return removed the apostrophe error but generated an error whenever there is an empty additional field. [code]

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Conversion From Type 'DataTable' To Type 'String' Is Not Valid

Aug 9, 2011

i encounter this error while passing a string as datatable.

I populate combobox1 with tables/sheets from excel and each table has datarows which i want to get the data and import to sql corresponding table, so, I declare 

Dim XLSTableName as String = Combobox1.SelectedItem

And I encounter the this error : Conversion from type 'DataTable' to type 'String' is not valid

how do i return the combobox1.SelectedItem as Datatable cos if i declare 

Dim XLSTableName as DataTable and pass it to the select Command thus:

Dim objCmdSelect As New OleDbCommand("SELECT * FROM  [" & XLSTableName & "], ODBConn)

to obtain the dataRows I got the following error:  operator '&' is not defined for types 'String' and System.Data.DataTable'

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Conversion From Type 'DBNull' To Type 'String' Is Not Valid

Jul 19, 2010

I am getting the above error msg with [code]...

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Conversion From Type 'DBNull' To Type 'String' Is Not Valid?

Feb 22, 2012

Im trying to check a specific item if its already expired. And for some reason, im getting this error "Conversion from type 'DBNull' to type 'String' is not valid."

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Conversion From Type DBNull To Type String Is Not Valid

Dec 12, 2011

I am pulling records from an access database onto my form and have a "Next" button to get to the next record, but every time it gets to the 5th record, the error msg, "Conversion from type DBNull to type String is not valid." because one of the text boxes (fields) from the database is empty.

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SQL - Conversion From Type 'DBNull' To Type 'String' Is Not Valid?

Feb 10, 2010

I'm using the following code to assign record fields to variable:

Dim IPAddress As String = dt.Rows(i)("IPAddress")

Unfortunartely if the field is empty in the row i get the following error:

Conversion from type 'DBNull' to type 'String' is not valid.How can I get around this error?

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Conversion Error On Line 5 Stating 'Conversion From String 'S' To Type 'Double' Is Not Valid

Apr 8, 2009

a user will enter a number, n, which ranges from 1 to 30. they will also enter a "P" or an "S" (sum or product). depending on which was selected, it will calculate the sum or product of the numbers from 1 to n.i'm having a conversion error on line 5 stating "Conversion from string "S" to type 'Double' is not valid." [code]

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Conversion From Type 'String' To Type 'String' Is Not Valid

Dec 21, 2009

I'm in the process of porting an old excel addin that was writen in VBA to VB .NET. The Excel addin interacts with a number of external com objects. The code sorta looks like this:[code...]

What I'm trying to do is read the string from the COM object and get it in durr for use later in my program.

That second line results in the exception posted above. If I try casting with CStr/CType I get the same exception.

The visual studio watch window reports the type of hurr.getString as a "System.__ComObject" whereas the VBA watch window reports the type as "Variant/Object/String".

Microsoft.VisualBasic.Information.TypeName(hurr.getString) says the type is "String".

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"conversion From Type String To Type Double Is Not Valid"

Aug 13, 2009

I created an application in vb.net 2005. It works fine on my machine. I tested several different test machines and all were working fine. As for the client, it's generating an error. My application reads from an excel sheet and imports the values to an oracle database. the error being generated is: "conversion from type string to type double is not valid". Why is it generating only on the client's computer and not mine?

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Conversion From String To Type 'Integer' Is Not Valid?

Feb 28, 2012

i have a text box and i want to insert the textbox value to my sql procedure in server and then generate record in the datagrid view ... the parameter in sql server i declare as varchar and actua database column item datatype is nchar.. anyway in what suitable datatype that i have to put in my visual basic for the textbox in order to transfer the vlaue to sql procedure and generate result

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Conversion From String To Type 'double' Is Not Valid

Mar 4, 2009

I have this program i have to do for my Intro class. The assignment is to have the user enter a pay code(A,B or C) and the amount of hours worked. If the hours is more than 40hrs, they will receive time 1/2. And it must also calculate a 22% Tax.I was getting this error: Conversion from string to type 'double' is not valid. But some how i eliminated it.[code]

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Conversion From String To Type 'Integer' Is Not Valid

Nov 21, 2007

I have the following IF Statement checking if the function GetNexstAddress (which gets the ClientID from  GetClientFleetInfo(i).CLIENTID) . SECONDARYCITY

is there.

If GetNextAddress(GetClientFleetInfo(i).CLIENTID).SECONDARYCITY(0) = Nothing Then
NextAddress = " No next Destination"
Else

[Code].....

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Conversion From String To Type Boolean Is Not Valid

Oct 24, 2011

The error occurs on the line If wba.Selected = "MARKETING CODE" Then.

[Code]...

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Conversion From String To Type Double Is Not Valid

Oct 16, 2011

i always got error every time i  run this program . here's the code.
 
'declaring variables
Const DEPOSIT As Double = 30
Dim dbltotal As Double

[Code]....

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Conversion From String To Type Double Is Not Valid?

Feb 8, 2010

I am trying to update MS-Access database where one field is boolean and updating a string. I am getting a error message "Conversion from string "Update Claims set appointed=" to type double is not valid".

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Conversion From String To Type Double Not Valid

Mar 11, 2009

I'm getting this run time error using VB 2008 Express:
"Conversion from string "" to type 'Double' is not valid."

Below is my coding
If cmbxitem.Text = "Brownish" Then
TextBox2.Text = 37
ElseIf cmbxitem.Text = "White Feathers" Then
TextBox2.Text = 30
'ElseIf cmbxitem.Text = "B/Wchicken" Then
'TextBox2.Text = 15
[Code] .....

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Conversion From String To Type Double Not Valid?

Apr 27, 2010

Imports System.Math
Public
Class Form1
'Declaration
Public
NotInheritable
Class Convert
[Code] .....

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Conversion From String To Type Integer Is Not Valid

Oct 20, 2011

I have the below code in my app... Nothing is declared as a integer so I dont understand or see where the problem could be... It is saying:

Conversion from string "9838 Co Rd 47" to type 'Integer' is not valid.

The address is flowing through the entire function as a string the only place I think it could be getting changed somehow is in a function call... Below is the function that throws the exception. Followed by the function that returns the address.[code]...

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Conversion From String To Type Integer Not Valid

Dec 2, 2009

I am currently making a project for school and this project is to determent the poker hand, where the user can only check 5 check box and each checkbox represent a card , and when I try to test it and check the box it would let me and this message popped up:
Conversion from string "" to type 'Integer' is not valid.
And the arrow point to this line of code
i = CInt(Mid(strChk, 1, 2))

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Conversion From Type DBNull To String Is Not Valid

Jun 21, 2010

I have the following code:
tb_Job_No.Text is a combobox

This is the code:
Public Sub RepCD_process()
ssql_Job = "SELECT * FROM Rep_Dist"
ssql_Job = ssql_Job + " WHERE (Job_Number = '" & tb_Job_No.Text & "') "
Dim Main_Form As New Main_Form
[Code] .....

Can't seem to get pasted this, when it is remark out all works. How to correct this and get data into the listview?

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Conversion From Type DBNull To String Not Valid

Feb 16, 2008

Populating a datatable from Access gives me this exception where a record has an empty field. How do I handle it?
System.InvalidCastException was unhandled
Message="Conversion from type 'DBNull' to type 'String' is not valid."

Code:
Private Sub ShowData()
lblCustNo.Text = CStr(dtOrderEntry.Rows(intCurrRow)("CustNo"))
lblCustName.Text = CStr(dtOrderEntry.Rows(intCurrRow)("CustName"))
lblAddr1.Text = CStr(dtOrderEntry.Rows(intCurrRow)("Addr1"))
lblAddr2.Text = CStr(dtOrderEntry.Rows(intCurrRow)("Addr2"))
[Code] .....

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Conversion From Type String To Integer Is Not Valid

Dec 13, 2009

Public Class Form1
Private Sub RealTime_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RealTime.Tick
Real_Sec.Text = DateAndTime.Now.Second
End Sub
Private Sub Real_Sec_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Real_Sec.TextChanged
Sim_Sec.Text = Sim_Sec.Text + 1
If Sim_Sec.Text > 59 Then
Sim_Sec.Text = 0
End If
End Sub
End Class

When the timer is on, it will tell the current seconds in real time, and when the text in the textbox for the Real_Sec changes, it will increment the text or the value in the Simulated seconds... FROM 0... No matter where the seconds are in the real seconds, it will display real or simulated seconds in the sim_sec text box... Starting from 0... But there Real Seconds, because the Timer is not accurate. So I Simulate the Real Seconds. How to write it the right way, it's keeps throwing the error:
An error occurred creating the form. See Exception.InnerException for details. The error is: Conversion from string "" to type 'Double' is not valid.

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VS 2008 - Conversion From String To Type (Not Valid)

Aug 20, 2010

I get this error:
"Conversion from string "7F676981" to type 'Long' is not valid."

When using this
Reader.Position = &HD044
TextBox2.Text = Reader.ReadHexString(4)
TextBox2.Text = CLng(TextBox2.Text)

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Conversion From String - SSN" To Type 'Double' Is Not Valid

Aug 13, 2009

while am executing the following code cmdSSN1.CommandText = "SELECT * FROM Patients WHERE SSN='" & Trim(txtSSN.Text) & "' AND id " <> EditPatientId
it shows 'Conversion from string "SELECT * FROM Patients WHERE SSN" to type 'Double' is not valid.

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Conversion From String YyyyMMdd To Type Integer Is Not Valid

Oct 2, 2009

I have a dataset containing a datatable, and I enumerate all rows in that datatable. When trying to format a column in that row, I run into an exception. (Part of) the code is:

For Each dr As DataRow In ds.Tables("records").Rows
file = dr("timestamp").ToString("yyyyMMdd") & "~.wav"
Next

This results in the following error message:

Conversion from string yyyyMMdd to type Integer is not valid. (translated from a Dutch error message to the English equivalent)

dr("timestamp").GetType.FullName results in "System.DateTime", so I don't understand why I run into this exception, as for example Now.ToString("yyyyMMdd") results in "20091002", and "Now" is of the same type as dr("timestamp"), "System.DateTime" that is.

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Conversion Using CDec From String To Type 'Decimal' Is Not Valid?

Jan 28, 2010

Please excuse the newbie question as I started learning VB last week . I wrote the following test code below to add two values entered in two textboxes and display it in another textbox. However I keep getting the exception. "Conversion from string "" to type 'Decimal' is not valid" with the code below and I cannot figure out why . I thought converting using 'CDec' resolves this issue ?

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InvalidCastException: Conversion From String To Type 'Double' Is Not Valid

Nov 2, 2010

I keep getting this error "InvalidCastException: Conversion from string to type 'Double' is not valid." whenever I try and run this piece of code. Could someone explain to me where it is trying to make a conversion to double? No matter what I do to my input string, I get the error.Here is the stack trace:

Input string was not in a correct format.Description:An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.FormatException: Input string was not in a correct format.

[code]...

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Keep Getting Error Conversion From String To Type Integer Is Not Valid

Jun 25, 2011

I designed a payroll application and I keep getting the error conversion from string to type Integer is not valid.Also when I enter the name in one of the textboxes it reads form and not my name.[code]

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Strange 'Conversion From String To Type 'Double' Is Not Valid

Aug 25, 2009

I have a PictureBox, some TextBoxes and a 'generate' button.

code:

I want to create an 'Image Generation' Program with a little help from YugiohCartMaker.net, and when i try to generate, this error appears...

Conversion from string [url] to type 'Double' is not valid.

Also a question... why does it stop with "/y" and not with "/ycmaker/createcard.php?name="?

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VS 2005 Conversion From String To Type Decimal Is Not Valid?

Jun 22, 2010

I have a xml node, which can be shown in immediate window as

?Me.SelectSingleNode("./FloatAmount").InnerText
"100.00"
?typename(Me.SelectSingleNode("./FloatAmount").InnerText)
"String"

However, I want to return a decimal value.

?cdec(Me.SelectSingleNode("./FloatAmount").InnerText)
Run-time exception thrown : System.InvalidCastException - Conversion from string "100.00" to type 'Decimal' is not valid.

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VS 2008 - Conversion From String To Type Integer Not Valid

Jul 29, 2010

I am working on a program that has a combobox that gives you selections for email address endings, but when I try to enter it in as part of the final email address get an error. Here is my
mail.To.Add(TextBox1.Text(ComboBox1.Text))

When I click debug, it give me this error. "Conversion from string "@txt.att.net" to type 'Integer' is not valid."
"@txt.att.net" is the value of the combobox selection.
In the end it should be something like: "anything@txt.att.net"
(Textbox1.text = "Anything" & the current ComboBox1.text selection = "@txt.att.net")

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