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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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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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 String To Type Double Not Valid

Sep 15, 2011

I am currently in programming class and I have tried time and time again to complete a form called "theater revenue" that was assigned to me. Even though I have typed in a lot of code, it keeps telling me "Conversion from string "" to type 'Double' is not valid."

These are the directions: "A movie theater only keeps a percentage of the revenue earned from tiecket sales. The remainder goes to the movie company. Create an application that calculates and displays the following figures for one nights box office business at a theater. Assume the theater keeps 20% of its box office receipts. Use a named constant in your code to represent percentage."

Here is my code....
vb.net
Private Sub btnCalculate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculate.Click
' Declare variables for the calculations.
Dim dblATS1 As Double
' Gross Adult Ticket Sales as Double
[Code] ......

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VS 2010 Conversion From 'String' To Type 'Double' Is Not VALID

Apr 26, 2012

[code]I'm trying to leave the textboxes A, B and C EMPTY so an error message box will appear saying "You did not put any value in textboxes A" or "B" "C".. but my program works if you put a value in the three boxes.[code]

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VS 2010 Conversion From String To Type 'double' Is Not Valid

Sep 1, 2011

I have a form, which holds several comboboxes, textboxes, checkboxes.I use an msaccess database to store the values into.When I enter text in a textbox and then click the save button I get the following error:conversion from string "" to type 'double' is not valid.But I really don't understand, the field of the database where the textbox text is being stored in is a text type.I searched google for it and the problem seems to be that the type of data from the textbox isn't the same as entered into the field of the database.But the strange thing is, is that as far as I can see, it is.[code]

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VS 2010 Conversion From String To Type 'Integer' Is Not Valid

Dec 4, 2011

I have an InputBox where I want someone to input a number. The number would be an integer. The line looks like this amount1 = InputBox("how many?", "how many?")If they click cancel, it errors out because it can't convert blank ("") to an int. How can I do this with InputBox and not get that error?

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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 '_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 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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VS 2010 Conversion From String DESC To Type 'Double' Is Not Valid?

Jul 26, 2011

I am developing a site in ASP.Net and VB.Net that will enable users to sort data in a GridView in Ascending or Descending order.The records are coming from an SQL Server Express database.

I go to click on a column heading to sort the data and I get the following error:

'Conversion from string "DESC" to type 'Double' is not valid.'

Below is the code I am using for the sorting:

[Code]...

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VS 2010 : Conversion From Type 'DBNull' To Type 'Date' Is Not Valid

Dec 30, 2011

When I close my form without saving I want to check if the data on my form has changed since the last time I saved the data.This peace of code, which I included at the bottom always worked fine.Except when I compade a DateTimePicker with a null value in the db.Than I get the error "Conversion from type 'DBNull' to type 'Date' is not valid."Probably on this peace of

Me.dtpVrijeDatum01.Value.Date <> CDate(reader("VrijDatumVeld01")).Date Or
Me.dtpVrijeDatum02.Value.Date <> CDate(reader("VrijDatumVeld02")).Date Or
Me.dtpVrijeDatum03.Value.Date <> CDate(reader("VrijDatumVeld03")).Date Or
Me.dtpVrijeDatum04.Value.Date <> CDate(reader("VrijDatumVeld04")).Date Or
Me.dtpVrijeDatum05.Value.Date <> CDate(reader("VrijDatumVeld05")).Date Or

The total code to check the changes is:

Private Sub CheckForChanges()
LeesCheckboxWaarde(Me.chkFacAdrIsBezAdr, intCheckFacAdresIsBez)
LeesCheckboxWaarde(Me.chkPosAdrIsBezAdr, intCheckPosAdresIsBez)

[code]....

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VS 2010 Conversion From Type 'MySqlDateTime' To Type 'Date' Is Not Valid?

Apr 7, 2012

I'm storing dates intoa table like:vb.net "INSERT INTO myTable (datum) VALUES ('" & Convert.ToDateTime(dgvrow.Cells(0).Value).ToString("yyyy/MM/dd hh:mm:ss") & "'" & ")", conn) This works perfectly. After storing the dates I need to load /show them into a MonthCalendar. This is where the error occurs.

[Code]...

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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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VS 2010 Conversion From String "Length - Ft" To Type 'Double' Is Not Valid?

Sep 6, 2011

I'm new to this board and I was wondering if you guys could help me out. I have a problem that needs to be resolved before 9:30PM tonight.

I'm a bit of a sloppy coder so work with me. Here's the code that's giving me problems:

[Code]...

I have 6 text boxes, 5 of which accept input. When they're focused on they become blank for a number to be typed in and upon losing focus, they add the labels etc. on their own.

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