Reading Data From SQL Without Spaces And Without Errors
Mar 8, 2011
2 problems i need to solve 1st is i create tabe in database some fields is varchar (100) and some is navchar(100) i can insert and read from this table easy
but when i try to read data i got the spaces i mean of the inserted data is just 10 letters i got about 90 letter as spaces for example
"john smith " without qouts i don't need this spaces
2nd problem in reading data i can read data with 2 ways but both of them include a problem
1st i can read data in datagridview and textbox's easy
i'm using textbox to search in first search i got result no problem but if i try to change the data in textbox and search again i got an error
"This causes two bindings in the collection to bind to the same property. Parameter name: binding"
the second error when i use the other code i can get the data in datagriedview only but textbox's come empty
i dunno if i can ask more than 1 question in same thread but i need fast response
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Mar 26, 2011
I've always been slightly stumped as to why the following happens if I write[code]...
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Jan 1, 2010
I just changed a control on a form from a masked textbox to a normal textbox because I wrote my own code to validate the data. I'm trying to clear the leading spaces that were created for this column in an Access database using the LTrim function and it doesn't work for some reason. The column is " :30" in the table and when I LTrim it and save the changes, it's still " :30" , not ":30". Is that leading entry not a space character?
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Jul 4, 2011
I am having problems writing correct data to a file. I create a string of characters (approx 5000 bytes long). The string is a mixture of text characters and numbers converted to bytes. I then:
a) write the string to a readable text file
b) display the string contents to the console
c) write the string to a file - BDF.bin (I tried both IO.BinaryWriter and IO.StreamWriter but get the same error)
The byte pattern for the text readable file and the data displayed on the console match and for the most part , data bytes in the StreamWriter file are correct (first 4096 bytes are OK) but there are some extra bytes and some wrong bytes.Here is a comparison of byte patterns (hex values character written to the file) starting at byte 4096
Console: 45 44 52 31 00 00 00 00 01 00 00 00 90 01 00 00
Binary File: 45 44 52 31 00 00 00 00 01 00 00 00 C2 90 01 00
The byte patterns match, however in the binary file, there is an extra byte (C2).To display the console data, I read one character at a time from the string and display it using hex(asc(mid(string,i,1)))I view the binary data in the BDF.bin file using a hex editor program. I even tried 2 other hex editors and all showed the same byte info.
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Oct 7, 2008
Using Access I created a few Data Access Pages. These web pages, once opened, work fine to manipulate data as intended, but they keep generating annoying warning messages.There are two messages that pop up every time the web page is accessed. Before the page opens the first message that pops up states: "This website uses a data provider that may be unsafe. If you trust the website, click OK, otherwise click cancel."After pressing OK on the first, the second message pops up and states:"This website is using your identity to access a data source. If you trust the website, click OK, otherwise click cancel."After pressing OK on both messages the page functionality works just fine.I've tried adding password protection to the database and even signing the project with a digital certificate, but I still get the warning messages. This would be fine except there are multiple end users for the access pages and I am trying to avoid the additional confusion this will create, especially since IT has restricted many of the users from editing the internet options.
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Feb 21, 2009
I am writing a simple app using Visual Basic 2008 Pro, and SQL Server 2005 as the backend. However, I copied the database file (.mdf) from another computer onto my laptop. I added it as a Data Source by having the Data Provider as "Microsoft SQL Server Database File" and have it attach the file to the local SQL server. However, it isn't set to copy the database to the output directory every time the program is run for debugging, as I thought that would save time.
Now however, the data update to the database are very wierd. I run the program, add some new data, save it, and it returns the new primary keys properly (that is, it turns from -1 to 4 or 5 or whatever, indicating that the data has been saved). When I close and re-run the application to check that the data has indeed been saved, it reflects the changes and shows me the new data. However, when the program is run again after some time, the changes I made are gone. I'm assuming this is due to some wierd way in which VB is updating the database that temporarily updates its cached or copied database, but doesn't actually change the real database. How do I fix this? I had previously done the same project on another computer, except there the data source was directly the local SQL server, and I had created the database directly on the server through Visual Studio itself, and I didn't face those problems then. Is there any way to manually attach the SQL Server database file (.mdf) to the local SQL server instance permanently, and change the app to use the attached database instead?
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Jun 9, 2011
I am trying to parse incoming data from a serial port that appears to be XML format but a few problems arise when going from a simulated setup to the real deal. I first made a this program at home using a serial port emulator and com port connector program that reads from a text file and then sends it through the com port, I then read it from the com port it is connected to it. My program is able to parse the incoming XML perfectly fine, I'm using an XML Literals syntax.
The problem I run into is when I setup my program with the device and try and parse the data that is coming out of it. The data I receive sometimes has a few lines of garble before it starts seeing my expected XML. Of course these few lines of garbled text throws me an exception, but even when it appears I'm getting a good clean start of my XML data my program still throws exceptions such as "unexpected end of line 1 line number (different lines)" or "multiple root elements line 1".
Am I going about this the right way? using XML Literals to process my XML string properly or should I use something else that will allow for not well formed XML? or am I just missing something. My device outputs data every 500ms and I can poll my device for stored data. An example of what I am receiving sometimes and what I am expecting is below. "The first few lines of text sometimes appear and sometimes don't" [Code]
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Oct 11, 2009
I am testing out this code which creates a excel file, and then call a sub to insert data into the file. The excel is created, but the function is not inserting the data. I am getting a error "External table is not in the expected format". I do not know what could be the problem.
This is the code below:
Imports Microsoft.Office.Interop
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
[Code].....
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Jan 31, 2011
I'm trying to add a row grouping row to my data-bound gridview. It works fine on the first response, but at the postback i got the "Failed to load viewstate" error.There is the code for the GridView's RowDataBound event:
Private Sub AddGroupingRow(ByRef eRow As GridViewRow, ByVal Css As String, ByVal ColSpan As Integer, ByVal Txt As String)
Dim cell As New TableCell()
[code].....
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Jan 4, 2011
We have designed an application designed for storing contact information of students (college study project).The application installed perfectly on Windows XP Home Edition (Service Pack 3). We also installed all the requirements (including .net 4) on the XP machine. But when we tried to work with any form that is linked with data, it pops up an error saying something about invalid casting for system.oledb.data and system.string.What may be the problem? This application runs fine on Windows 7, also loads fine in Windows XP Home Edition SP3. BUT when we open a form that has database linkups the above error pops up. Is it in anyway related to the .net framework? Which is possible our biggest doubt!This is really getting frustrating, as my group has worked really hard on this project. But, our prof., says that the project should work on Windows XP, but he is also stumped, with the reasons.
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Apr 13, 2009
I've hit a small issue on a project of mine. I have a comboboxcolumn on a datagridview and the items list has the items ("enabled" "disabled") as the values (stored at design time). When my sql table gets the value "Enabled" or "ENABLED" stored somehow as it's value then I throw a dataerror.
I am trying to avoid this dataerror, I was told to modify the value during the cellformatting event however with my experience the dataerror fires before the formatting. What is the workaround to this behavior? As a textboxcell type the error is not present, it's all because of the case sensitivity of the "items" list on my comboboxcell
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Sep 23, 2011
I have a .net application that uses customerrors web.config module to display meaningful messages for errors. It works without any issues for 500 errors/exceptions caused by non-ajax and ajax components (updatepanel). However, in a scenario where updatepanel's asynchronous request times out, there is no error raised at all. I was able to see the timeout in firebug and come up with a solution that would at least display the error message as an alert and then redirect the user to the 500 error page using javascript but it's not quite doing what the rest of the application does in case of an unhandled errors like these. I basically just want everything to go through "LogEvent" mechanism so based on the severity of the error, it does the necessary work.This 500 error page doesn't have anything in the Server.GetLastError() for these timeout scenarios. Is this an expected behaviour? Can it be changed so I do have access to these timeouts in Server.GetLastError() OR maybe just run this error through "LogEvent" mechanism? Is there a better/more graceful way to handle this issue?
Below is my code to give you an idea, not exactly what I have in my application but pretty close.
Web.Config
<customErrors mode="On" defaultRedirect="~/Errors/ErrorUnknown.aspx" redirectMode="ResponseRewrite">
<error statusCode="500" redirect="~/Errors/Error500.aspx" />
</customErrors>
[code]....
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Mar 28, 2011
i'm a freshman and was handed this assignment a short while ago and i'm having extreme difficulty figuring out why i keep getting the following error message whenever i click btnGenerate.Click on the form:Error1: Unable to apply this change while debugging. 'Private Sub GroupBox1_Enter(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles GroupBox1.Enter' was deleted that modifies 'Public Class Form1'. You must revert the change or stop the debugging sessionBasically the assignment is requesting that we build a 'Call Cost Calculator' and since im relatively new to this i've never worked with strings before and also get the follow errors:Warning2Variable 'sCountryBeingPhoned' is used before it has been assigned a value. A null reference exception could result at runtime.Warning3Variable 'sPhonePlan' is used before it has been assigned a value. A null reference exception could result at runtime.
My form codes:
vb
Public Class Form1 'heading Const sFormHeading As String = "Call Cost
[code]....
I reals because it's driving me mad and i'm honestly quite literally stuck and can't move on until i get this sorted.
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Feb 6, 2012
how the various elements that help you handle errors work together. Have tried several options and can't make head nor tail of it. The underlying table has two columns, an autoincrement integer and a text column with the following settings:
[Code]...
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Jun 12, 2012
I must have inadvertly messed up my data connection but not sure how to fix it. when I check the table adapters I can view data but when I load the app I get these errors and no data loads, how can I look at this log and make sense of how to fix this?
************** Exception Text **************
System.Configuration.ConfigurationErrorsException: Configuration system failed to initialize ---> System.Configuration.ConfigurationErrorsException: Only one <configSections> element allowed per config file and if present must be the first child of the root <configuration> element. (C:BungeAppsBunge Post InstallerinDebugBunge Post Installer.exe.Config line 7)
[code]....
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Mar 2, 2012
I have a modbus TCP device that I have managed to connected to through my VB source code.
I want to poll (continueously read) data from certain registers of the device, and store the polled data in a file (text,csv, excel).
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Apr 2, 2012
Data binding should be an extremely simple thing to manage but I can't find a SIMPLE solution to the following problem.
I have two forms
Form1 contains a 4x4 MSFlexGrid (unfortunately an unmanaged COM object but I can merge cells, which I can't do with a managed Datagrid)
Form2 contains other controls which change the data in the Flexgrid.
I connect the two with a Public 4x4 array. Form2 changes the data in this array. I can update the grid data by reading the array. But how do I bind the Grid to the array so that it auto-updates - which is the whole point of binding isn't it?
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Nov 29, 2009
I am reading data from a socket (as bytes) and storing this data in a string. Then later i need to access specific bytes within the string and do some math with them. However the bytes that I read back from the string are not what I am expecting.
[Code]...
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Aug 8, 2011
After exporting data using a third party component the data in the excel sheet isn't type correctly. Excel thinks that some values are string while they are numbers and a little green triangle shows up.
We've coded the following to fix this:
For Each objCell As Microsoft.Office.Interop.Excel.Range In objWorkSheetReport.Range(objWorkSheetReport.Cells(1, 1), objWorkSheetReport.Cells(Me.RowCount + 10, Columns.Count + 10)).Cells
[Code].....
This removes all those little green triangles but is really slow.
Is there a faster way to convert a Range of data quickly so the green triangles don't show up?
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Jan 4, 2012
So when i build or click debug on my program. No errors come up and its smooth. So i decide to publish my programme. However. I come up with a bunch of errors during the publishing.
Here they are:Error 1 Cannot publish because a project failed to build. 1 1 Simple CALC
Error 2 Unable to copy file "binReleaseSimple CALC.exe.manifest" to "binReleaseapp.publishApplication FilesSimple CALC_1_0_0_0Simple CALC.exe.manifest". The specified path, file name, or both are too long. The fully qualified file name must be less than 260 characters, and the directory name must be less than 248 characters.
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Mar 26, 2012
I've been asked to prepare a proposal for a client for a new development. The finished product will require copying of personal DVDs, e.g. a wedding or christening video, to AVI or similar format.
Is it possible in vb.NET to read data from a DVD and encode it as an AVI file? If so, can you give me some pointers to how I might research this more.
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Nov 24, 2009
I am working in VB.NET 2003 and here is the issue of the day (for me):
I have an application which is supposed to read data from a CSV file one line at a time then pick out the 9th item ( a number) in the line and then add these numbers together for a total. The problem is the routine does not get beyond the first line. The code is as follows:
Dim total As Decimal = 0
Dim reader As StreamReader
Try
[Code]....
How do I get this routine to advance to the next line of the CSV file and continue to do so until it has read the last line?
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Mar 16, 2012
how can i display data from a sql database in a listbox?
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Mar 19, 2010
How can I read data from a HID device (USB RFID Reader)and which acts like a keyboard.
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May 29, 2012
I need to display the MinAH price and the name of the item listed in the table. If possible, I would also like to make a listbox of all the servers/realms in World Of Warcraft, giving the user the ability to change the realm that they want from the list because the prices will be different. Another thing would be a specific item instead of the ones already listed in the initial table (see link if you don't understand). You can search items on the website, I'm not sure how I could incorporate this so the user can select a specific item.
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Feb 23, 2009
I have been following tutorial from Bort and writed encrypted string to registry with this
[Code]...
Now I want to read that from registry and get the date witch is encrypted to decrypted to textbox so I can compare it to date.today. How can I get that date from registry. I have used this Tutorial: RSA Encryption in VB.NET and tried to get these trial version tutorials to work together.
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Jan 25, 2011
I am doing my academic research on ARM MINI 2440 and "i want the code to read the data from sd card and send that data to the serial port.
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Jun 10, 2011
im having trouble reading in lines of data using arrays and a structure. I believe my main problem is figuring out how to keep track of the lines read in, even if the whole array size isnt used up. Also, To break up each line I am trying to use the split function to seperate spaces, but dont know if im doing so correctly.[code]
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Jun 16, 2009
i have read a lot about reading data from pdf but still very confused. i have to gather data from a invoice which is in a pdf format and store it in the database now the invoice contains text, tables, signature and barcode. this i have to again print after adding some of my data in another format and hence i need to get the data from the pdf file.
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Jan 9, 2009
Private Sub frmAttendace51_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'clear data set of any existing data
objDataSet.Clear()
'fill schema
[Code]...
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