DBNULL Error In .NET?
Nov 9, 2011I am receiving this error on this line
ctl.Value = CType(Me.Value, DateTime)
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DBNULL Error In Data Grid?
Nov 9, 2011I am recieving this error on this line
ctl.Value = CType(Me.Value, DateTime)
Conversion from type 'DBNull' to type 'Date' is not valid.
I am using Data Grid View and This is a calendar Type Column
Getting Error With DBNull When Using LINQ To DataSet
Nov 12, 2011I've got the following LINQ Statement:
[code]...
invRecord.Pack_Num is a field of type Integer. This means that when I try to access it, if it is DBNull I get a StronglyTypedException. The above code throws this exception. If, however, I remove the "invRecord.Pack_Num = PSNum" and in its place put something like "True", the code works fine. So I guess my question is, why is that that invRecord.IsPack_NumNull() returns False when the value is in fact DBNull and what can I use as a conditional instead? I've been beating my head against the wall for a while now and I can't find a solution to this problem.
Populate Listview And Getting A DBNULL Value Error?
Jun 5, 2010Im trying to populate my Listview and im getting an DBNULL value error. Ive tried the following code but it doesnt work.
Me.SpMainSearchTableAdapter.Fill(Me.CapitalVisasCRMDataSet.spMainSearch, Me.tbxSearch.Text)
Me.lsvSearchResults.Items.Clear()
[Code].....
.net - LINQ Error Type DBNull Column?
Apr 29, 2011I am querying a datagridview and it works great unless one of the cells has nothing (dbnull). How to over come this?Exceptions: Operator '=' is not defined for type 'DBNull' and type 'DBNull'.
Dim query = From row As DataGridViewRow In DataGridView1.Rows _
Where row.Cells(SelectedColumnIndex).Value = filter _
And row.Visible = False _
Select row Distinct
DBNull Error - Return Formatted Date
Mar 20, 2012I have dates I am reading from a database, when I format the dates and there is a blank date I have a dbnull error...
What is the correct syntax to say
IF txtOrderDate = DBNull
then
txtOrderDate = ''
ElseIf
txtOrderDate <> DBNull (return the formatted date)
' Populate Header
[Code] .....
SQL Update Statement - DBNull Error With Replace?
Apr 22, 2012I am creating a form that is able to update data in SQL server after selecting an MS Access file (.mdb). I am having an issue where the data has a single quote ('). I found out that the solution was to use Replace() - to replace the single quote with two single quotes - Replace(string, "'", "''").Now, for some reason, I am getting an error "Conversion from type DBNull to type String is not valid." Here is the code.
cmd = New SqlCommand("Update Child Set " & _
"TopLevelProject = '" & row("TopLevelProject") & "' ," & _
[code].....
VS 2005 Exporting Datagridview To CSV - Dbnull Error
Jun 9, 2010** Edit - just thinking - I have this export code elsewhere in my application; testing it with blanks works fine. All the fields in the two forms are text fields. The only difference that I can see is that the form that is causing me a problem is based on a left join query from my database; the form that works is based on a flat table. Any ideas???
I have tried everything in my (very, very limited) knowledgebase for VB and am completely stumped. I'm sure the fix is simple, but no clue where to go. (I got this code from a site which I didn't make a note of, and cannot find it by doing a google search)...
The code listed below is supposed to export a datagrid view to CSV. It works fine - if, and only if - all the fields are populated. If one of my columns is blank, then I get a ""Conversion from type 'DBNull' to type 'String' is not valid." error. **Edited to provide exact error message
The code that's giving me a problem is the second IIf(intRowData < intColumnCount, strDelimiter, "").
[Code]...
Combobox Giving 'DBNull' Error When The First Item Is Chosen
Oct 5, 2009I am using combobox to populate values from a table, 'Suppliers'. I put this combobox in a form wherein the order details are filled up. This column 'Supplier' is a Foreign Key and set to NotNull in the order detail table. Selecting the first available entry on the combobox gives error 'SupplierID cant be Null' . Selecting the 2nd value is OK, first choosing 2nd and coming back to 1 is also OK. This error comes up when trying to update the database.Even with the first value, the combobox is having a text. I would like to know why the error.
View 5 RepliesError - Operator '=' Is Not Defined For Type 'DBNull' And String "test"
Feb 23, 2010I 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.
ERROR "The Value For Column 'Type' In Table 'Fields' Is DBNull"
Feb 8, 2010I have error. How I can fix this? My error message is "The value for column 'Type' in table 'Fields' is DBNull."
Dim adapterFields As New _MyDatabase_1DataSetTableAdapters.FieldsTableAdapter
Dim fieldsRow As _MyDatabase_1DataSet.FieldsRow
For Each fieldsRow In adapterFields.GetDataByCategory(Me.ComboBoxCategory.SelectedValue)
msgbox(fieldsRow.Type)
Next
Forms :: Error - Conversion From Type 'DBNull' To Type 'Date' Is Not Valid
Oct 10, 2010I'm getting the error "Conversion from type 'DBNull' to type 'Date' is not valid."here's the line generating the error.
dtReady.Value = dSet.Tables("Db").Rows(Inc).Item("Fixed_Date")
I'm using a date/time picker control and sending the db value to it. I know that the value is null, but I don't understand why the Picker can't be blank. Is there a way to let it be blank? Or should I set up a way to check for nulls and assign today's date or something just in case?
VS 2008 : Error: Conversion From Type 'DBNull' To Type 'String' Is Not Valid
Jun 15, 2009how 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.
Error: Conversion From Type DBNull To Type String Is Not Valid
Jul 29, 2011I 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"
Error:Conversion From Type 'DBNull' To Type 'String' Is Not Valid
Dec 13, 2010I'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.
"Conversion From Type 'DBNull' To Type 'Boolean' Is Not Valid" After Checking That It's Not DBNull
Jan 18, 2012In my ASP.Net Web-Application, I'm getting this error: Conversion from type 'DBNull' to type 'Boolean' is not valid.
[Code]...
Error - Conversion Of "DBNull" To "Boolean" Is Not Valid
Jul 19, 2010I have a checkbox called Yes on my datagridview. On my datagridview, I have three records and each has the checkbox "Yes" which are unchecked and the values are saved as Null in the table in the database. Now, when I check one of the Yes checkboxes and call the save function. I receive the error - Conversion of "DBNull" to "Boolean" is not valid.
The code is as shown below;
For irow = 0 To DgvReturns.Rows.Count - 1
query = "UPDATE dbo.tblProjectPatients SET Yes ='" & _
CBool(DgvReturns.Rows(irow).Cells(2).Value) & "'where ProjectID = " & _
[code]....
Now, the problem is because there are other two records with values as DBNull on the datagridview i.e.., (it cant update it to the database, hence the unhandledexception).Therefore, can in the update statement state that if the Yes checkbox is not checked to be saved as False to the database.
Cell Datagridview Blank - Error Appear "conversion ">=" DBNULL To String "" Invalid"?
Jan 13, 2010the code bellow for preview/print .it ok but when i leave the first row ...don't care which cell is blank.The Error was appear"conversion "> =" DBNULL to string "" invalid"IF the cell at the first rows is not blank .i can print that data[code].....
View 4 RepliesCan't Get Rid Of DBNULL
Dec 13, 2011I am teaching myself vb.net with visual studio 2010 and i have ran into a wall. I have a datagrid on my form that shows all of my customers that are in the dataset that was created in access 07. I have a search bar and check boxes to select which column name to search in. Whenever I search it throws up a strong typing exception,
System.Data.StrongTypingException was unhandled by user code
Message=The value for column 'PickupTime' in table 'CustomerRouteTable' is DBNull.
Source=EXBSTESTDatabase
[Code]....
I think this means that there is nothing in the field, but this is a field that nothing should be in. If i comment the throw exception out it moves on to the next one that has nothing in the field. I tried just putting 0's in all of them but it still gives the same exception.
Handling DBNull In Dot Net?
Jan 19, 2012I have been having an error that DBNull cannot be returned as a String and after hunting around I came up with the folowing but have had no sucess. it is very inportant that this code can handle DBNull as it will encounter this often.
[Code]...
How To Set A Double To DBNULL In .net
Mar 10, 2010Dim k as nullable(of double)I am INSERTING a rec in database containing K (sometimes it has some value otherwise a null) It works ok.But when i UPDATE a rec and assign a field the value of k and when k is NULL
it gives me an error that you cannot assign a NULL , you should use DBNULL.But i think DBNULL.value can only be assigned to an object not to double.
If Syntax For Dbnull And Value?
Nov 12, 2009I need to make something like :
if isdbnull(value) or value = something then
'do something
else
[code].....
Replace DBNull With Zero?
Sep 29, 2009So I'm importing Excel data using ADO into a DataTable then pushing out to an Access DB. A couple of the Excel columns have several blank cells that I would like to change to a zero before pushing it out. How can I check/change the DT null values to zero? I've done some searching but was wondering if I could do it without a loop.
View 3 Replies'DBNull' When Searching A DataGrid?
Dec 21, 2011I'm writing a program for my friend as a gift. He's a movie lover, and has this Excel spreadsheet with all the movies he's watched in it. I converted the spreadsheet to an Access database,then used that database in my program. I've been going by the example in my textbook (Programming with Microsoft Visual Basic by Diane Zak), and everything been working until I put in a "Find Movie Title" button. I want to be able to search the column "Movie Title" for a title input by the user (whether it's the whole title or just a few characters)Here's the code:
Private
Sub btnFindTitle_Click(ByVal
sender As
Object,[code].....
.net - Filtering DBNull With LINQ?
Mar 8, 2010Why does the following query raise the error below for a row with a NULL value for barrel when I explicitly filter out those rows in the Where clause?
Dim query = From row As dbDataSet.conformalRow In dbDataSet.Tables("conformal") _
Where Not IsDBNull(row.Cal) AndAlso tiCal_drop.Text = row.Cal _
AndAlso Not IsDBNull(row.Tran) AndAlso tiTrans_drop.Text = row.Tran _
[code]....
Run-time exception thrown : System.Data.StrongTypingException - The value for column 'barrel' in table 'conformal' is DBNull.
How should my query / condition be rewritten to work as I intended?
Asp.net - Correctly Check DBNull In VB?
Jan 13, 2012Why does the following code: A = not IsDBNull(CurRow("BuyBook")) AndAlso CType(CurRow("BuyBook"), string) = "Yes" results in the following error:
Conversion from type 'DBNull' to type 'String' is not valid.
Catch DBNull Across Entire Row
Nov 17, 2010I am writing a program that pulls data from a database.For each table that I pull data from, I write a series of If Than Else Statments to catch any null values and assign Nothing so as not to throw an exception.Is there a way to check against a DBNull value without writing an If THan Else Statment for each column I am pulling from the database?
View 7 RepliesCheck Column Is DBNull Or Not?
Feb 10, 2010I have simple app code:
Dim sw As New StreamWriter(FileName, False, System.Text.Encoding.GetEncoding(Encoding))
Dim adapterPositions As New MyDatabase1DataSetTableAdapters.PositionsTableAdapter
[Code]....
How I can check column is DBNull or not?
Conversion Of DBNULL To String?
Apr 17, 2009Is it possible to converty a type System.DBNULL to a string type?
View 3 RepliesConvert DBNull To Date
Jun 5, 2011I wants to ask how to convert DBNull to Date type?
For Each row As DataRow In dt.Rows
i = 0
Dim array As Object = row.ItemArray
[Code]....
array(i + 10) is datetime type, in the program above, if the Datetime column contains items, it still can run. However, when it loops to a row where the Datetime column does not have value of datetime (or the column is null), then an error " Conversion from type 'DBNull' to type 'Date' is not valid" is occured. I tried to use the if statements as program above but it seems like cannot works.