Operator = Is Not Defined For Type String And Dbnull

Oct 9, 2010

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim connectionString As String
Dim cnn As OleDbConnection
Dim adptr As OleDbDataAdapter

[code].....

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Error - Operator '=' Is Not Defined For Type 'DBNull' And String "test"

Feb 23, 2010

I have the following query

Dim get_rmf_2 = From rmf In t_rmf _
Where rmf!NIVP = nivp_rap

When i run it i get an error :

Operator '=' is not defined for type 'DBNull' and string "test".

I suspect this is because the column "NIVP" in the datatable contains null values, I've tried yhe same thing without null values and it works.So how can i make this work ? ; the column "NIVP" really has a row "test" , and a normal SQL query works fine.

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Operator Not Defined For Type DBNull And Boolean

Jul 13, 2009

I have this little problem :Operator '=' is not defined for type 'DBNull' and type 'Boolean'. This the code:
For i As Int32 = Me.DataGridViewSearch.Rows.Count - 1 To 0 Step i - 1
If DataGridViewSearch.Rows(i).Cells(6).Selected = True Then
Try
What I am trying to do is to loop threw a datagrid and find the checkboces that are checked.

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{"Operator '=' Is Not Defined For Type 'DBNull' And Type 'Double'."}?

Jan 12, 2009

when a user inputs a value into a text box, i am searching that value in my dataset.although the number that i entered is in my dataset, i am getting this excemption.

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Mar 29, 2012

Dim ip_list, ipa, ipb, ip_start, ip_block, ip_end
Dim Response = Nothing
Dim SubNetMask

[code].....

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Jan 14, 2010

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[Code]...

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Jul 30, 2011

The intent of the code is to open an xls file -minimize it , search for keywords . there are columns like test case name ,priority(simple ,medium and high) with associated keywords.If keywords are found, it shld save the test case name - Priority in a text box. When i run this code i am getting err in

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Jul 20, 2010

The following code at run time gives the error - Opearator '=' is not defined for type DBNull and type 'Boolean'.

The reason is the data at the table is set as NULL value.. How can I change it to accomodate the error.

Dim irowNo As Integer
For irowNo = 0 To DgvReturns.Rows.Count - 1
If DgvReturns.Rows(irowNo).Cells(2).Value = True Or

[Code]......

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Error: Operator '&' Is Not Defined For String " UPDATE BALANCE SET OBBALANCE = " And Type 'DataRowView'

Mar 22, 2011

Here textbox11 contains a float value and combo box contains a string do i have to put text or selected item

cmd.CommandType = "UPDATE BALANCE SET OBBALANCE = '"& TextBox11.Text &"' WHERE CUSTOMERNAME = "& ComboBox1.Text & " "

It gives the following error: Operator '&' is not defined for string " UPDATE BALANCE SET OBBALANCE = " and type 'DataRowView'.

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VS 2010 Datagridview Operator = Not Definded For Type DbNull?

Jul 27, 2010

I'm having a contextmenu in a datagridview. I need to disable a menuitem if there is no value in the currentrow.cells(..).value.I tried several thing, but no luck: If dgv.currentrows.cells(1).value= "" then... 'disabe menuitem. I'm getting the error: Operator '=' is not defined for type 'DBNull' and type 'Integer'.

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Error: Operator '=' Is Not Defined For Type 'FileInfo' And Type 'Boolean'

Aug 19, 2010

This is my

[Code]...

This is my error: Operator '=' is not defined for type 'FileInfo' and type 'Boolean'.

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Jun 10, 2009

Public Pixels(0 To 95, 0 To 127) As Variant Red = Pixels(X, Y) And &HFF i get this code from VB6, and when i transfer to VB05 i got problem said " Operator 'And' is not defined for type 'Color' and type 'Integer'. " i sent to VS2005

Public Pixels(0 To 95, 0 To 127) As Object
Dim red As Object
Red = Pixels(X, Y) And &HFF

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Apr 16, 2009

In my application when i click the button i'm getting this" Operator '=' is not defined for type 'Char' and type 'Boolean'." But when i test it locally there is no problem at all!

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May 5, 2011

Okay, I am TOTALLY confused here. I have a class... say MyClass. It has several properties of another class of my type, say MyHelperClass (along with other properties).

I am doing the following:
Dim inst As MyClass = New MyClass() With {
.p1 = sv1,

[code].....

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SQL Query - Operator & Is Not Defined By Type GUID

Apr 20, 2011

I've got a problem in one of my SQL queries, the type GUID can't be used with the operator & (obviously from the title). Here's the few lines of code which I'm using:

Dim ClientsAssetID As Guid = New Guid(ClientsAssetIDTextBox.Text)
Dim Client1 As Guid = New Guid(Client1TextBox.Text)
Dim Client2 As Guid = New Guid(Client2TextBox.Text)

[code]....

ClientsAsset, Client1, Client2 and Client3 are all of type GUID, but are entered into the textboxes as strings, are converted to guid and then should all go smoothly into the query, but it's having a problem with linking everything together. The error I'm
getting is "Operator '&' is not defined for types 'String' and 'System.Guid'.How do I fix this? I've tried a few different things, such as using Ctype in the query, but they have also circled back to this error.

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Operator '+' Is Not Defined For Types 'Client' And 'String'

Oct 20, 2009

I am working on a site that I would like to pass information from one page to another. For some reason I keep getting the above error.

//Code
Partial Class Customer
Inherits System.Web.UI.Page

[Code].....

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Operator '+' Is Not Defined For Types 'Client' And 'String'?

Feb 10, 2010

I am working on a site that I would like to pass information from one page to another. I'm new to asp.net but not other languages, I'm just trying to learn some stuff. For some reason I keep getting the above error. The code I am using looks real similar to the code in the Murach book I am looking at

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Operator '&' Is Not Defined For Types 'String' And 'System.Guid'

Jun 22, 2010

I have a problem with Operator '&' someone may with this problem.

[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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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 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 '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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Feb 15, 2012

i try to put picture in mysql with vb.net, first i convert with this function : [code] i try to use that function for storing picture to mysql database : INSERT INTO myImage (image) VALUES ('" & convertImage(PictureBox1.image) & "');and then i have this error : Operator '&' is not defined for types 'String' and '1-dimensional array of Byte'i create a table (myImage) with image field (LongBlob)

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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 'DBNull' To Type 'String' Is Not Valid

Jul 19, 2010

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

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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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Error 1 Operator '&' Is Not Defined For Types 'String' And 'System.Xml.Linq.XElement'

May 17, 2012

i am downloading data from xml using linq library those data i want to add them on a textblock item

TextBlock1.Text = TextBlock1.Text & result

but it has an error :

Error 1 Operator '&' is not defined for types 'String' and 'System.Xml.Linq.XElement'.

When i am changing this line to :

TextBlock1.Text = TextBlock1.Text & result.Tostring

it works but it adds this data :

"<"data> data <"/data>

instead of :

hello

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Error Message : Operator '&' Is Not Defined For Types 'String' And '1-dimensional Array Of Byte'

Apr 26, 2010

I am having a problem in the following codes

Problem in        "'" & rawData & "'")"

Error Message  Operator '&' is not defined for types 'String' and '1-dimensional array of Byte'.

Complete Coding:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim fileSize As Integer
Dim rawData() As Byte

[code]....

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VS 2008 Error 1 Operator '&' Is Not Defined For Types 'String' And 'System.Windows.Forms.Comb?

Sep 2, 2009

with this code dont know wht its not working source = wc.DownloadString(String.Format("http://" & cboHSearch & "/cse?cx=013269018370076798483:gg7jrrhpsy4&cof=FORID:1&q=" + cboEngine.Text + "&sa=Search", Me.cboEngine.Text.Replace(" "c, "+"c), resultCounter))

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Mar 5, 2012

I have this problem that when the textbox don't have a value I always get this error "Conversion from type 'DBNull' to type 'String' is not valid." [code]...

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Feb 5, 2011

I am receiving the following error "Conversion from type 'DBNull' to type 'String' is not valid" when checking a textedit control to see if it is empty or more than 1 characters in length.

Public Class CustomValidationRule
Inherits ValidationRule
Public Overrides Function Validate(ByVal

[code].....

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Jul 22, 2010

Following is my code. Private Structure DISPLAY_ELEMENT_TYPE

[Code]...

Actually this is vb6 to .net converted code. I m getting compile error at following line

temp = Lset(DispElem(i)) bcz Lset is not supported in .Net Lset accept string data type for first parameter and interger for second.If you know any alternet solution or if you have any source code for Explicit convert UDT to string type and vice versa.

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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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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
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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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Dim eRow As Integer
eRow = datagrid.CurrentRow.Index
txtSelecteditem.Text = datagrid.Item(0, eRow).Value

This all works fin when there is a value in the cell it is picking up. However, I hit a problem when this filed is blank.

The error I get is: Conversion from type 'DBNull' to type 'String' is not valid.

How can I get the textbox to populate with null if the field is null.

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[Code].....

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Feb 27, 2012

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[Code]...

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Feb 15, 2009

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not much else i can think to add here but it's making it hard to work...i'm using it like...

Dim Temp As String = "Hello" & vbCrLf & "Hi Again"

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