It's the first time I see this error.
System.IO.IOException: Data error (cyclic redundancy check).
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.Directory.DeleteHelper(String fullPath, String userPath, Boolean recursive)
at System.IO.Directory.Delete(String fullPath, String userPath, Boolean recursive)
I'm planning to create an VB.net application for retrieving data from a database (MS Access) and store it to a web server (MySQL data base). I really have confusion in my mind. I'm planning to use task scheduler so that the program will automatically run. I'm planning to set the time every 5 minutes.How can I avoid the redundancy of data? For example, I'm planning to get the sales for 5 minutes, after 5 minutes I will do it again. I think there will be redundancy in that case.
View 4 Repliesi think there is a problem with my code below....it insert the data more than 1 record (data redundancy) in the server database....i think there is a problem at the place i highlight with red....
If Not Update_ServerPOS() Then
Update_TempPOS()
End If Public Function Update_ServerPOS() As Boolean
[code].....
I wanted to make a collection of definitions public, for which the Enum class was a perfect candidate, but I also had the need to check variables against all the possibile enum members to see which one they were.
In this scenario my solution was to write a public enum class in which all the members were made available, and replicate the same listing in an array in order to iterate through.
In fact the only way I know to iterate through all memebers is a cycle (either "for each" or "while somecondition" and a moving index). But I guess there must be a simpler way to make use of an enum class.
My application is like this : i have to search my data from database with some check box and text box when user select check box specific function go on and then when user enters some range of value in textbox then the result will shown in data grid view after that i can print it by selecting data
my vb.net code is as follow:
Imports System.Data
Imports System.Data.SqlClient
Public Class XtraForm1
[CODE]............
I m also pasting the demo picture.
I have a program for school project that has input fields for Name, Address, City, State and Zip. I need to error check so that the fields are not empty.I have used If statements that check to see if the fields are empty and shows a message box if they are but if I leave the whole form empty and click the button that activates it, all the if statements go- one by one instead of pausing for the user to input the required data.How do I check for data and make the program stay there until the data is input? I have tried TRY/CATCH but it won't catch this type of error.
this is the
'This program computes customer's bills at the pizza shop for all combinations of
'crusts, toppings, sizes and discounts
Option Strict On
Public Class PizzaForm
[code].....
I tried this code to check if the data in textbox1 not equal to any data in column name, so insert the data that in the textboxes to the table1. Esle.. do another thing. But it didn't success with me.
Code:
Dim conn As New OleDbConnection()
conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" _
& "Data Source =" & Application.StartupPath & "DataBaseName.mdb "
[Code].....
On line
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim dblunit As Double
Dim dblprice As Double
Double.TryParse(txtunit.Text, dblunit)
[code]....
line 6, it seems to skip that even if checked and moves to line 16 and inputs that, can;t really figure out why it's doing that, probably something simple, that i am overlooking.
i working on the update function using textboxes and a checkbox however the error arises when it gets to the check box the error is "Syntax error (missing operator) in query expression 'role_id right_id enabled_flag'." i cant see the error
my code is
strsql = "update cg_security_user_right set user_id=@field1, role_id = @field2, enable_flag=@3 where role_id right_id enabled_flag "
Dim objcmd As New System.Data.OleDb.OleDbCommand(strsql, acsconn) ' the
[code].....
I am just trying to call a little error check function, and if the return value, isOK, is false, let the user change stuff and then call the function again. If isOK is true, the rest of the program runs. For some reason, when i run the test under conditions I know to be valid, or true, the function still returns isOK = false.
CODE:
text boxes. (Where Combo box1 is the Drive Letter, Combo Box2 is a folder, And Text box is another folder. ie.
If My.Computer.FileSystem.DirectoryExists("ComboBox1.Text & " " & ComboBox2.Text & " " & Textbox1.Text") Then
MsgBox("File found.")
[code]......
I'm trying to Error Check for a radio button option of either mother or father. The Error Check needs to make sure that one of the radio buttons is selected.[code]...
View 2 Replieshow to do an error check on WebServices i.e. to check if the site which has the webservices is not down and also if internet connection exists?
View 2 Repliesi have publish data on data grid(in vb express 2010) and want to check for the data in each an every row. there are few columns and i want to check the string "OK" under "Status" column. if there is any "Not ok" found then need to prompt a message describing the details of whole row under.
View 4 Repliesi have a string (the letters will never be in the same order):
TFTADFDAAFDADADDAFFDTFFTDFTFTDTTAFDAFADTAAATFDTADAFFTFTDDFDAFFTAT
1) i know it is always going to 65 characters (no numbers)
2) it will only have the letters ADFT
i want to loop through each row of data and check if the data contains this.
System.Text.RegularExpressions.Regex.IsMatch()
I create an empty boolean array check_state(), and then if a condition is met later in the script, I redim it and save a list of check box states as booleans into the array, and later check the array values, but I can't work out how to do this without causing an error if the array was not defined to begin with
View 1 RepliesTo write a new file to the hard drive I�ve always used (for example):-
FileOpen(1, "C:FileName.txt", OpenMode.Output)
Trying this today I get an error message� Access to the path 'C:Check.txt' is denied. MSDN say I should use: -
Dim file As System.IO.FileStream
file = System.IO.File.Create("c: est.txt")
So although I couldn�t see how to specify the mode� I tried: -
Dim file As System.IO.FileStream
file = System.IO.File.Create("c:Check.txt")
With exactly the same result� Access to the path 'C:Check.txt' is denied. It says I don�t have permission.
I have developed a system to update various programs. I put the programs updated into a particular folder of my site and Users can launch their update program to download and update their application.
The user interface has two progress bar, one for the single program in download and the second for the total download.
For calculating the total amount of bytes for the second progress bar I need to know the dimension in bytes of programs and files to be downloaded before start downloading. See the attached code.
For that I read, in remote mode, the size of all the files checked and I obtain the total amount of bytes.
All works fine with various type of files (.EXE - .DOC - .JPG - .TXT etc).
The problem arises with the Crystal Report file (.RPT).
The error 404 occurs but the file exists, the server WEB is active and the other files of the list are summed. If I compress the same file in .ZIP all works.[code]...
I have encountered this error Unable to cast object of type 'System.String' to type 'System.IFormatProvider'. when i try to use a "if" statement to check for a certain string format in a the text of a string.heres the code i have done:
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnInsert.Click
Dim unit As String = txtUnit.Text
[code]....
I'm writing an application that imports and tidy up address data into a cleaned, deduped excel workbook ordered in rows with each column as an address field. One of the issues I've ran into is that we sometimes get a workbook where the multiple address fields are held in a single cell with line breaks. I've written code to extract all of this data out of the excel sheet in to a dataset with each sheet as a table and the address fields contained within. I now want to create a new Excel workbook from this data with the address fields in Row and columns the problem I have is I can Open/create the Workbook but when I try to insert a new Sheet (Table) I get an error saying the Workbook is read only....
Private Sub MakeSimpleXL(ByRef DsTemp As DataSet)
Dim dsTable As Data.DataTable
Dim tblName As String
Dim dsRow As Data.DataRow
[CODE]...
Here is the error: System.Data.Odbc.OdbcException: ERROR [42000] [Microsoft][ODBC Excel Driver] Cannot modify the design of table '3 _ 10$'. It is in a read-only database. at System.Data.Odbc.OdbcConnection.HandleError(OdbcHandle hrHandle, RetCode retcode) at System.Data.Odbc.OdbcCommand.ExecuteReaderObject(CommandBehavior behavior, String
[CODE]...
It looks to me like it is trying to create the table (Sheet) but has the workbook opened as read only....
I have this code:Dim Result As New DataTable DataAdapter.Fill(Result)
'bind data to visible surname/name grid If Result.Rows.Count = 0 Then NoInputBottom.Text = "No Results. Please widen your search criteria and try again" NoInputTop.Text = "No Results. widen your search criteria and try again" Else
GV.DataSource = Result
GV.DataBind()
End If
I have also tried moving the check to the gridview like so:
If GV.Columns.Count = 0 Then
NoInputBottom.Text = "No Options Selected: Please select your search criteria and try again"
NoInputTop.Text = "No Options Selected: Please select your search criteria and try again"
End If
When I run the code. the noinput labels do not have value, the null check seems to be failing? Please can you tell me how to display a message if the search returned no reults.
I am writing a User Control. Into each control I am loading a custom biz object. Because the biz object implements IDataErrorInfo interface I am able to use the ErrorProvider control on the user control.
I am binding the ErrorProvider to the biz object like this:
Me.ErrorProvider1.DataSource=MyBizObject This is all working perfectly EXCEPT. The validation is happening (and therefore I am displaying the blinkey error signs next to all feilds) as soon as the User control is loaded into the host form.
Each biz object implements a SAVE method and I want the validate to not happen until the save event is triggered on the biz object.
how to check data if it is already in the database?
View 8 RepliesOn my form with my detailed layout of my database in textboxes i can change my data or add new record.
how can i verify if there was any changes to a record when the form is being closed or when my cancel button is pressed.
i want to create a message box that warns tha there hav been changes made should it be saved yes or no
i want to check the first record in the database and do updation. similarly i would like to check all the records one by one and do updation. iam using the sql database. In my vb.net applcn i have two tables "FATRAN " and "GLDetails".
[Code]...
Again I have problem with checking whether DataReader object has data or not?
Dim cmd as SqlCommand
Dim drd as SqlDataReader
cmd = New SqlCommand ("SELECT * FROM Stock", conx)
drd = cmd.ExecuteReader()
[Code]...
This code works. i insert 3 string and then check if the database already save this code.if the first string does not exist it works well.but when 1 string "already exist" or found in the DB, all of the next string say its already in db even though it haven't. what should i do?
For count = 0 To strArr.Length - 1
If strArr(count).Contains("=") Then
str1 = strArr(count)
coun = str1.IndexOf("=")
str1 = str1.Substring(0, coun)
[Code]...
I have 2 checl boxes bol1 and bol2 and i stored a record after ticking one of them and now i want to make a function to retrive what i stored in the access data base in check boxs as well according to the ID. the table name is check_table and the columns names are "bol1 , bol2" the type is (yes,no).
View 3 RepliesI'm having problem regarding session items. Before I use them, I want to check if they exists, but using this codes gives me error:[code]I think Session("SomeSessionItem") tries to acquire the value of the session item. If the item doesn't exists then it throws exception. But how do I check if a session item exists before using them? I have a page Home.aspx.In the Home.aspx.vb, I instantiate a WebUserControl SomeControl.ascx. Note that in Home.aspx.vb event handler Page_Load I can use a condition to check session without getting an exception.Inside SomeControl.ascx.vb I'm trying to access the session, here's where the exception occurs.
View 5 RepliesI have an array of boolean data that I'm trying to display on the screen using 144 check boxes. Is there an easy way of updating all 144 check boxes with the data from an array and an easy way to update the array when changes are made to the check boxes?
View 3 Replies
