Invalid Attempt To Call Read When Reader Is Closed (While OleDbDataReader.Read)
Sep 1, 2009
There are already multiple threads about this, but i don't have the knowledge about the different SQL databases/methods to make heads or tales from it.I am using an OleDbDataCommand, an OleDbDataReader and the following code
Dim Query2 As OleDb.OleDbCommand
Dim RetVal2 As OleDb.OleDbDataReader
Query2 = New OleDb.OleDbCommand("Select [section], [title], [id] From " & DtSections & " Where [volume] = " & volu & " And [chapter] = " & chapter & "", AccessConn)
[code]....
value)In order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user. Type) Object?
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Dec 23, 2011
I am gettting the following 2 errors:
Invalid attempt to call Read when reader is closed and sometimes Invalid attempt to call MetaData when reader is closed when attempting to read from a sqldatareader object. What I want is to list groups in listview. The last column is "Total Numbers".[code]...
It works ok for the first row but after that the first error generates. I don't want to include the COUNT function in the main sql cos then i would be required to group the rest fields (there are 9 of them totally). I tried MARS but it don't work at all in my connection which is like
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Mar 31, 2011
"Invalid attempt to call Read when reader is closed." is returned when trying to use a SqlDataReader in a Thread or BackgroundWorker (Do While z.rdr.Read() in the bold sections - I know this code does the same thing twice....). I have looked at a few forum posts but I did not find a method to keep the SqlDataReader open when passing the arguments. How do I thread the SqlDataReader loop?
[Code]...
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Aug 31, 2009
I have an error that is during the query to a database ExecuteReader 'phase' of my program, i am assigning an .OleDbDataReader to a variable RetVal and then, i am giving this RetVal = Query.ExecuteReader, and then in the while the query is being read loop(While RetVal.Read) i am getting an error in runtime that is "Invalid attempt to call Read when reader is closed." I know this means i have to open the reader, but i don't know how to do this, as i have been using this process for a few weeks and haven't had this error pop up. (and i have managed to use the while loop)If you're not living on the edge, you're taking up too much room
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Jun 9, 2011
i am getting an error like invalid attempt to read when reader is closed
[Code]...
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Mar 25, 2009
When I run my application the following code prompts an error. Ideally, I want to populate the TxtOracleNo with a value read from another table on my form based on certain conditions i.e., prac_no, prac_eid and pay_method is the same in both tables then populate the Oracle No on TxtOracleNo text box.
The error given is
"Invalid attempt to read when no data is present"
The function is shown below
Private Sub Oracleview()
'Open the database.
'Delete any existing record
Dim cmd As New SqlCommand
Dim conn As SqlConnection = GetDbConnection()
[Code] .....
I checked that data in the database and it is available in both tables. Probably, the problem is where I call the function. Presently, I call it on loadform.
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Jul 18, 2012
In a nutshell...I have developed a site in ASP.Net and VB.Net which allows a user to create an order and submit it to a SQL Server backend database.
When the order is placed...an xml file is also produced, showing the items that have been ordered...which is then loaded in to a program to update stock quantities.
The code I have is as follows:
Public Sub butSubmitOrder_Click(sender As Object, e As EventArgs) Handles butSubmitOrder.Click
Dim sqlConn As New SqlConnection
[Code].....
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Jul 17, 2011
I am not sure why this code doesn't work. I have follow according to the table field data and it I am still unable to get the SQL Datareader to work. I have checked the tables and all datafields, everything is correct. But I still am unable to read data from the database.
Dim connectionString = ConfigurationManager.ConnectionStrings("CleanOneConnectionString").ConnectionString
Dim myConn As New SqlConnection(connectionString)
myConn.Open()
Dim cmd = "Select * from [Member] where Email = @Email"
Dim myCmd As New SqlCommand(cmd, myConn)
[Code] .....
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Dec 21, 2010
i am using visual studio 2005 check my code and let me know what i am doing wrong
[Code]...
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Dec 27, 2010
Can you maybe tell me what is wrong with this code?I get an error on the line were the writing is in red.
db.OpenConnection()
strSQL = "SELECT * FROM ChaletBookings WHERE BookingNo = '" & strBookingNo & "'"
dr = db.getData(strSQL)
[code].....
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Feb 7, 2010
with .net 2008 exp + MySQL 5.0
my code is like this;
Dr_cug.Read()
cug = (Dr_cug.Item(0).ToString)
Dr_cug.Close()
error msg is; Invalid attempt to access a field before calling Read()
i have called the read here what's going wrong please
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Oct 12, 2009
why is the datareader closed? I had to change this from a stored procedure to dynamic because our IT guy was encountering trouble changing the sp permissions.. so there's definitely a time factor
Dim cmd3 As New SqlCommand
cmd3.Connection = connect
Dim dr2 As SqlDataReader
[Code]....
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Dec 3, 2010
i have made application in vb.net which access the MFC Regular dll and it works fine if i run application from windows xp but when i run same dll from windows 7, it gives me above error.
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Mar 6, 2009
I have following XML structure, how can i use XML reader to read it as its quite large.[code]...
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Nov 18, 2009
I have created extension method which operates items in IEnumerable(Of T). .NET Framework 4.0 has new method File.ReadLines which returns IEnumerable(Of String). I got two implicitly typedvariables which operate on lines returned by File.Readlines.The first iteration goes OK, but when second iteration starts, program stops ancompiler goes to my extension method and points to ProcessFunction(item) with the following: "Cannot read from a closed TextReader".If I change data to data.ToList, then no error occurs. What can be wrong?
Here's code:
Module Program
Delegate Sub ProcessFunc(Of T)(ByVal item As T)
[code].....
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Aug 16, 2010
I have the first form and create 5 checkboxes which are connected to my db. Whichever checkbox is checked and the value will be inserted into the db (value: 1; data type: tinyint).And now, the second form will pull out the data base on the which checkbox is checked when the button is clicked. But for somehow i got stucked at the following code.
The first form:
Dim nValue As Boolean
If chkbox5.Checked = True Then
nValue = 1
[code].....
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Apr 16, 2009
I have a function that queries the server to add items to a drop down list. Here is the excerpt in question:
While reader.Read()
With f.items
'f is the drop down list object
[Code].....
I want to be able to use this same function over and over to populate all the drop down lists for the whole page, but am getting the error "column g.tostring not found". How do I get this to be handled as a variable string?
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May 16, 2009
Radio button 2 beacuse there are 3 and you have to pick one (The right one) to advance on to the next form.
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Jul 2, 2009
Is there a method of using the stream reader to read webfiles?
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Mar 14, 2010
I am trying to use the eID SDK (for using the belgian ID-card) in VB. It's supported but I can't get it to work. I have never worked with sdk's before. I did manage to get it to work in c++ in console but I really need it in visual basic. Also the VB examples that come with the sdk are made in an older version of visual studio and when my version tries to convert them they don't work. I want to use the sdk to see when a card is inserted into the reader and to read out the data. (both i got to work in c++ console).
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Mar 18, 2010
I'm trying to read from two tables in mysql:
[Code]...
Or even other techniques on achieving the goal of reading data from two tables using data reader? This is a winform, not a web form
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Apr 30, 2012
I have a text file name list.txt which contains data like following;
AC-No. Name Time State New State Exception
100 ZULFIQUAR 09/04/2012 01:53 PM C/In Invalid
100 ZULFIQUAR 10/04/2012 01:39 PM C/In Invalid
100 ZULFIQUAR 11/04/2012 01:38 PM C/In Invalid
[Code]....
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Oct 19, 2010
From few days I am doing efforts to read web pages using webbrowser control in my desktop application. But it is very slower than my expectations(because I want to read lots of pages in minutes and browser control reads almost one page in 5 to 10 seconds), what I need is to read two or three tags written in web page.
So finally I decided to use something, which can give me only source code of page. I think StreamReader will help me to read it. I am not sure if it is flaxible with my purpose, or something else is there which can give me only html source code of web page.
I have written this code to read html code, but it gives error.
Quote:
System.ArgumentException: URI formats are not supported.
public static string Navigate(string URL)
{
[code]....
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Jun 21, 2012
I my small application to read bar codes. url...
1. Code do you code to read what this scans.
2. Does the reader just read the numbers added to the buttom of the bar code? so with that i could look an item up in a database?
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Jan 27, 2009
I am trying to make my application read data from a file. Then save the data back. However I keep getting an error which says the file is still open so cannot be edited. I also read that there is an issue with the streamreader and streamwriter do not close the program straight away. I was wondering if anyone had a way around this or any alternative ideas. Heres my code so far!
[Code]...
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Nov 4, 2011
I have the following code. I am loading the xml file, it's fine. When get into my loop and try to read the line I get unhadled exception and the following error
'Part ID="1"/SalesPrices/OrderPrice/GrosscostsAPiece' has an invalid token.
I have discovered that the reader is not liking the Part ID="1" part. How to overcome this problem considering the xml will always have that element as it is. Need to extract the value in the GrosscostsAPiece element.
document.Load(xmlFile)
for Each element As XmlElement In document.SelectNodes("document/body/Parts")
arr(1) = element.SelectSingleNode("Part ID="""1"""/SalesPrices/OrderPrice/GrosscostsAPiece").InnerText
Next
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Oct 14, 2011
I have been looking all over the net trying to find a program that can read data from a USB CCID card reader.
after several hours and several pages of useless info i thought maybe there is a way i could create a simple progeam in VB to read the data, so i started another long search for info also to no avail.
Does anyone know of anything like this or if its even posable?
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Mar 8, 2012
I'm using stream reader to read some text(txt format) n show in textbox1. I want stop at the second last line to get the string.Below is my code:
path="c:dic.txt"Dim reader As New StreamReader(path)Do While reader.?? //how to instruct to stop when read until second last line,because i don't know how many lines in the text file??
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Mar 10, 2009
I am using Visual Studio 2005. I am using a data reader to read an Excel spreadsheet and want to update a SQL Express table. The datatypes in this table mimic a software application I will eventually be passing data to and are listed in the comments in my code. No matter what I do or change, this will not run. I even populated my spreadsheet with zeros and this will not run. I have found many suggestions on the web and tried changing things but nothing seems to work. I also don't know specifically which variable is causing the error or the proper way to make sure there are no blanks in this spreadsheet.The error says "conversion from string "" to 'Double' is not valid Here is my code:
Public Sub btnUpload_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUpload.Click
'Connect to the Excel spreadsheet
Dim xConnStr As String = "Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=" & txtFileName.Text & ";" & _
using a data reader to read an Excel spreadsheet and want to update a SQL Express table
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Nov 2, 2009
Is it possible to read a string and call the method of the same name?For example: I have many buttons and if the user presses the button named A1, I want the Sub AI() to be called. I don't want to do an explicit If-Then for each button. Rather a common ONCLICK method that is called by all buttons and another method (the same name as the name of the button) is called.
Example:
Sub Click(byVal buttonName as string)
call ButtonName ' <<<< Error. ButtonName is string and not a Method.
End Sub
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