Query Return Value - Getting An Error In Runtime That Is "Invalid Attempt To Call Read When Reader Is Closed" ?
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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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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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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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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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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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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May 2, 2006
A VB5 program I wrote years ago stopped working and is now giving me this error:
Run-time error '380':Invalid property value
I cannot figure out what has changed, since I run that program almost daily. It was working fine, then stopped (without any changes to the program). I suspect I may have uninstalled something it uses, but cannot figure out what.When I open the VB5 IDE, I get an error saying:
'c:program filesdevstudiovbComct232.ocx' could not be loaded--Continue Loading Project?
If I say no, it does not load and I cannot see the source code.If I say yes, it does load and I can see the source code but I get weird compiler errors.
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Feb 2, 2010
When I attempt to run a program I just finished coding I get the following message: "Error 1 Handles clause requires a WithEvents variable defined in the containing type or one of its base types." Looked it up online and still does not make sense to me. If I need to paste code or anything else let me know and I will do so ASAP.
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Jan 28, 2011
I am new to VB. I was trying to insert a record into access database with data reader. I was getting OVERFLOW error at runtime. My understanding is that overflow error occurs when we assign values that to variables that exceeds the maximum size of the data type.
Following is my code
Private Sub InsertRecord(ByVal CustomerID As Integer)
Dim RowArray() As String = Split(Me.lblRow.Text)
Dim intPrice As Integer
Dim decTotalPrice As Decimal
Dim mySQL As String
[Code] .....
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Jun 2, 2010
Actually we have a system for doctors in dispensary and when they try to access records for the patients from doctors module they able to do it but when they try to modify records and save it gives an error "Run-time error '5': Invalid Procedure call or argument" We are using oracle 8i as database and vb6 as fronend.
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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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Apr 17, 2012
I'm using Microsoft Visual Basic 2008 Express Edition. I have a Folder Dialog Browser added in my form and I call it when the user presses a button. The folder path string is stored in a string variable and displayed as text in a text box. (maybe I should use a combo box)
My question is: If the user inputs by hand a non existent path, how do I return an error message, stop the file creation into the invalid path, and return to my main form?
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Nov 28, 2009
Any thoughts on what might cause a thread error like this?Error:InvalidOperationException was unhandledCross-thread operation not valid: Control 'Form1' accessed from a thread other than the thread it was created on.
Relavent Code:
Private Sub SerialPort_DataReceived(ByVal sender As System.Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
[code].....
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Jun 24, 2011
here is my Query. What is wrong with this?
rs.Open "SELECT * FROM Installment_w_DueDate where LastDocDate < (SELECT LastDocDate FROM Installment_w_DueDate where AccountNo = '" & txtAccountNo.text & "')", MDIMain.strConnect, adOpenStatic, adLockReadOnly
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Mar 11, 2009
I'm using VB6 and trying to get an instance of a Type Library object.After i retrieved the object and i'm trying to invoke a method. I'm getting this exception. However, i've checked with the parameters and its type. it is correct.I found something fishy, that method doesnt have return value. But it is throwing a compiler error whenever i'm trying to call the function and the compiler error went off when i get a return value from that method.I don't know,
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Feb 29, 2012
I have this as my transactions code and I'm having an error connection closed . Iv tried fixing it with odb.open but i dont know where should I put it
[Code]...
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Mar 15, 2009
I have a simple scraper. It works on some websites, but on some there is this Error:
Quote:
IOException was unhandled Unable to read data from the transport connection: The connection was closed
It is occuring at "Dim htmlresults As String = Urlcontents.ReadToEnd()".
'Create the HttpWebRequest object
Dim req As HttpWebRequest = WebRequest.Create(URL)
'Set the timeout to 1 second (or 1,000 milliseconds)
req.Timeout = 10000
[code]....
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Dec 28, 2010
I'm making a Visual Basic GUI application to display whether a number of my ports are open for people to know whether things like my website and my Minecraft server are open.My problem is I have absolutely no idea how to do this in Visual Basic.Basically, I'm asking for something which sends a signal to an IP with a specific port, if it is open then return true, if it's closed, return false. Similar to: http:[url]....
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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 29, 2011
I am having a problem with this code. I have used this code before on other apps and it works, but I don't have a clue as to what is going on here.
This is the whole event. I get a runtime error msg thats says "Syntax error(Missing Operator) in query expression"
I think this is Legacy SQL coding but I don't know how to make it better.
Private Sub btnEdit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnEdit.Click
Dim Question As Integer
[Code].....
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May 27, 2010
i have create a procedure to return data reader value, but it not return and returning null reference?
'Public Shared Sub GetData(ByVal Tablename As String, ByVal queryfield As String, ByVal Id As String, ByVal lblmsg As Label)
' Try
' Dim Cons As OleDb.OleDbConnection = DBHelper.GetConnection
' Dim Com As OleDb.OleDbCommand = New OleDb.OleDbCommand("Select * FROM [" & Tablename & "] WHERE [" & queryfield & "]=" & Val(Id), Cons)
[code]....
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Oct 18, 2009
I have a table in my database and I want to return the rows in a data reader and retrieve them in variables. I can do that well but I can only return the last record. The reader doesn't process all the rows.
Try
Dim myconecction As String
myconecction = My.Settings.DataSource
[Code]......
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Dec 12, 2011
I use this code to return records in a DataGridView:
[Code]....
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Nov 12, 2011
I have a 'next' button which changes the questions when clicked. How do i make the questions keep changing to another question from a file with only 1 button when clicked and also display it on a label with 4 radio buttons with answers in vb. I always get an error " Cannot read from a closed text file "
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