Asp.net - Avoid IndexOutOfRangeException Indexing DataReader Columns?
Feb 9, 2010
I am having a little trouble with an 'IndexOutOfRangeException'. I think it is because when the code tries to get the DateModified col from the database it sometimes contains NULLS (the users haven't always updated the page since they created it).
Here is my code;
s = ("select datemodified, maintainedby, email, hitcount from updates where id = @footid")
Dim x As New SqlCommand(s, c)
x.Parameters.Add("@footid", SqlDbType.Int)
I'm fairly new to .NET programming. I am trying to check if there are settings in a database table and if not, create some default settings. The problem is that when there are no settings I need to make two calls with the datareader and it keeps giving me problems. I originally was only using one datareader but made two to attempt resolving my issue, didn't work. Then I tried closing the datareader and I get errors because it returned a nullreference.
I have a problem with my project. here is the problem:
My code for login is as follows:
dim conn as SqlConnection = New SqlConnection("Data Source.................) dim cmd as SqlCommand = New SqlCommand("Loguser",conn) cmd.CammandType = CommandType.StoredProcedure
[CODE]...
Now the error i get is that "there is a datareader associate with this connection that need to be closed"
Is there away to check the size of DataColumnCollection?
I'm getting the error: System.IndexOutOfRangeException: Cannot find column 12. at System.Data.DataColumnCollection.get_Item(Int32 index) at System.Data.DataRow.set_Item(Int32 columnIndex, Object value) at MSProjectApp.frmCSVParse.ReadCSVToTable(String Filename) in Y:softwareVisualStudio2008MSProjectMSProjectAppMSProjectAppfrmCSVParse.vb:line 83.
i have a small project that basically connects to a mysql database online and displays the records in a listview. This works but the problem is:I have 2 buttons , 1 loads 1 database1 and works fine, the seconds ones as less colums in the database like database 1 has ID,Username,Password,Version,Notes
But database2 has ID,Username,Password and not the other 2 colums.
So i have this If reader("Version") = IndexOutOfRangeException Then
How can i 'count' through items in a list box using a do loop?
in the vb6 code i have the format is as folows, but the error is List is not a member of combobox, i know what the code wants to do, but i can't think of the member of combobox to use. (My question is what is the "new list"?)
For i = 0 To drvDB.Items.Count - 1 If InStr(1, drvDB.List(i), "Netapp-1", 1) <> 0 And InStr(1, drvDB.List(i), "malika", 1) <> 0 Then
I am working on a 32-bit binary/hex/uint masking calculator and have run into a snag. When I attempted the following, it created an error:
For i as Integer = 4 to 126 TextBox(i).Visible = True TextBox(i).Clear()[code]....
Since this sequence of events is in 4 different places in my code depending on a user screen selection, for obvious reasons it looks really bad. Is it possible to use indexing instead?
Private Sub TbxInput_KeyUp(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TbxInput.KeyUp
[Code]...
Basically, what this code is supposed to do is compare the text inputted in the input textbox with the text of the string answerstring. It seems to successfully compare the two, but every time I type the first char into the input textbox the program crashes, givingmythe Out of Range Exception. I assume it means the Char() "array" thats built into vb is out of bounds, however as i've set the while loop so that it only is executed when the whilecount is less than both the length of the input textbox and the answerstring, I don't see how it could be out of bounds.
I was testing out an application that I created which then I recieved an error as said in this topic title. The application that I am making is one where it requires 2 form GUIs, my main one is called frmConferenceRegistrationSystem (the first picture) and my secondary one is called frmConferenceOptions (The second picture) and what they are supposed to do overall is total up the cost of registering for a conference that is selected in frmConferenceOptions and the error that I am recieving is within the ElseIf statements in the frmConferenceOptions form (third picture and first section of code) And also here is the rest of my code for both of my form GUIs at the bottom of this topic
If ltbList.SelectedItem(IntrotoECommerce) And ckbConferenceRegistration896.CheckState = CheckState.Checked Then My frmConferenceRegistrationSystem Code: Public Class frmConferenceRegistrationSystem
I am working with a listbox that contains reportnames. Some reports will have parameters, some will not. This application lets users view and run SSRS reports. It also allows them to send email messages to one or more recipients with a web link to the SSRS report using Report Viewer. What I have done with the listbox is whenever a report that has parameters associated with it, the control (DateTimePicker) appears on the screen for the user to pick a date. When a report with no parameters is selected, it simply changes the Visible property of the DateTimePicker to false so the user won't have to use it. Everything works fine, I am able to pick a report with parameters passed as part of the link that gets sent via email to user. User clicks on it and report gets displayed with the correct parameters in the ReportViewer. However when I exit out, I get this IndexOutOfRangeException exception. Here is my code for listbox -
Private Sub lstBxReportName_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles lstBxReportName.SelectedIndexChanged Dim y As Integer
[code]....
When I debug, error is on second Dim statement for rowViewReportNameChange. I guess I can simply include the Dim statements as part of my Try block and I can catch the exception?
strSQL = "select * from transactions where TransactionID='" + txtTransactionID.Text + "'" ReaderQuery(strSQL) While dr.Read
[code].....
The weird thing about this, is that when I first run it, I was able to Bind it to all the Textbox and thought everything went smoothly, but when I run it again without any changes in that code, that error suddenly appears... sometimes that error went to other dr.item(""
I run a "make table" query to gather some numbers from a database. I then display a list that contains the numbers that I have gathered. The list will very from 1 number up to 20 numbers. I then want to run a report (print it, not display) using each number in the list. When I get to the end of the list I want to stop and close the list. I can do this if my list were say 10 numbers long each time but the list varies. The below is what I have. I repeat this 20 times(changing the # in the () ) to cover the list if it returns 20 but I want to stop if it is shorter than 20.
I've been trying to build this application with vb .net 2005 for the last couple of weeks in a computer programming class. The purpose of the program is to parse data from an html table displayed in the webbrowser and display it in a datagridview format (I plan on expanding it later). I've coded pretty much everything, but I keep getting an error related to the arrays that neither I nor my teacher can figure out. I attached a zip file of the complete project, in case anybody who was willing to look at it needed the rest of the program. I also included an "Items.htm" file with a html table in case people wanted to test running the program.
Public Class tableForm Private tfColumnInteger, tfRowInteger As Integer Private DataSet As DataSet = New DataSet("HTML Parser") Private Table As DataTable = DataSet.Tables.Add("Table")
i have a string with data when i tried to retrive character by character in a for loop but the size of the string is just 256 but the actual size is more than that... as soon as it passes 256 it throws IndexOutOfRangeException while its printing well in msgbox. I have removed newline, tab using
I have a situation where I have a databound datagridview and if you try to scroll to the bottom about half way there it generates a System.IndexOutOfRangeException. However if you click on one of the header columns, causing a sort to occur, before you try to scroll all is well. Any ideas as to why I can only scroll my datagridview after it has been sorted and not before? Interesting enough if I click 'OK' it just re-generates the error. This occurs several times over and I can see the rows in the datagridview being blanked out one by one with each click of 'OK' until all visible rows are gone and then...poof...all seems fine again and I can scroll and click like normal.The first screen shot is of the initial error dialog. The second is a shot of what is happening to my datagridview as I click through the series of resulting error dialog boxes.
i have just started learning vb and am enjoying it but am having problems. i want to design a three-way dictionary that allows a user to type in a word (English, Kazakh, or Russian) and have that word translated into the other two languages. The user can also add his/her own words and translations to the dictionary.My dictionary is called: "dictionarykre" and is formatted as follows: engword=kazword=rusword. i am reading the dictionary line by line and parsing it with "=", then putting the words into arrays.i keep getting the following error intermittently: IndexOutofRangeException was unhandled. Index was outside the bounds of the array. The error throws on the "KazListBox.Items.Add(arraytextfile(1))" line.i change the dictionary and the program will work for awhile, then the error will occur again.
Here is the code in VB.NET (using Visual Studio 2010)... in the form_load event.
[Code]...
Why I don't get the IndexoutOfRangeException on the tNumberInteger(4) = 10 ? Some students have the same problem, on others it's working fine. I don't see any differences in the settings.
I'm still a newbie to programming and in school we are working with arrays.We received a program that needs to have modifications done to it and I don't understand why the "89000" amount is outside the array bounds.It is a console app. that calculates amortization.
I want to access each entered element in an textbox as an index in ArrayList. But, the problem is that whenever I enter value in the textbox, it stores all the values in single arraylist index.
What must i do for the program to control the value of x automatically? that is, suppose i click on btn1, value of x must become 0; if i click on btn2, value of x must become 1 and so on.
I have a lambda expression that builds a list ofanonymous types. I would like to include a property in the anonymous type that is a counter. So the first entry is 1, second 2, third 3, and so on.I thought I recallenyone know the syntax for defining an indexing variable as part of a Linq query or lambda expression?
