How To Append Data Without Overwriting Previous Form
May 5, 2011
I have this code I use on my form which has worked fine up until now I need to add another form to my project but the text from form 1 gets overwritten when form 2 gets added How can I append my data without overwriting the previous form.
Dim sfd As New SaveFileDialog
sfd.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*"
sfd.ShowDialog()
Dim writer As New System.IO.StreamWriter(sfd.FileName)
writer.Write(RichTextBox1.Text
[Code] .....
The following code writes some data on an xml file. If I want to write on the same file twice the code overwrites the old data with new ones. How do I update the data instead of overwriting them? (i.e., write at the end of the xml file instead of overwriting the data)
Dim XMLobj As Xml.XmlTextWriter Dim enc As New System.[Text].UnicodeEncoding() XMLobj = New Xml.XmlTextWriter("C:" & current_scen & ".xml", enc)[code].....
I am trying to click on certain rows in a datagridview and have the information in the rows sent to a textbox. It does not append each row to the textbox though, which is what I want it to do. it just replaces it with the row I click on. What's wrong with my code. I have tried cell click too.
Private Sub dgProducts_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles dgProducts.Click Dim i As Integer
i want to create a table that include a current year data and as well as previous data to be compare. here is the example of the table that i want to create: but i want to compare one of the annual data with the previous year. as example i want to compare between the data of current AR of 2007 with the current AR for 2006, Current AR of 2006 with current AR for 2005 and go on~, but i have no idea how to do it.
I have a DataGridView on a form that is being populated from a SQL table dataset by giving criteria from a previous form. I have 6 columns in the dataset, of which the last column should be combo box column containing items "Done" and "Pending". How do I make this bound column to a combo box column and display the value as well as the alternate item too in the combo box?
I am having an issue on the listbox when the new data value equal to previous data then = to "0". However, I want if the new data value( A ) is equal to the previous data( B ) then ( A ) equal to ( B ).
Delegate Sub ListBoxUpdater(ByRef listbox As ListBox, ByRef str As Object) Private Sub OnQuoteUpdate(ByRef QuoteUpdate As LingLib.structQuoteUpdate) UpdateListBox(lbBox, QuoteUpdate.tQuote) End Sub
[code]....
My problem is when the new data comes out from the API, if it is equal to the previous data and it will appear 0. But what i want is the new data comes out is 0 and it will equal to previous data. e.g: first data comes out is 12.00, in above case, if the second data comes out is 12.00 but it will shows 0 which means unchanged. But in my case now, i want if the first data come out is 12.00, then if the next data is unchanged (0) and it will appear 12.00 and so on.
I am currently working on a API. I am having an issue on the listbox when the new data value equal to previous data then = to "0". However, I want if the new data value( A ) is equal to the previous data( B ) then ( A ) equal to ( B ).
Private Sub UpdateListBox(ByRef listbox As ListBox, ByRef str As Object) If (listbox.InvokeRequired) Then Me.BeginInvoke(New ListBoxUpdater(AddressOf UpdateListBox), listbox, str)
my app will be parsing an array of data and generating text strings (of around 80 chars each), which I then want to append to a text file. What is the best (fastest) way to do the file appends? file size will be up to 40K lines.
how can i split the recieved data to my vb.net application and then save it, so for example whatever starts with e must be appended to a textfile and whatever starts with a must be display in the label.[URL]..
Dim Type As String = frmFrontEnd.cmbModel.SelectedText.Substring(0, 4) cmbType.SelectedText = Type
i would like to take a selected aircraft type from a previous form and put it into the form i am working on at the moment, but i want to edit the string so it only has 4 characters.I thought the above line would do it but apparently not. the error is to do with the length.An example:the model in 'the other' combobox is A330-200/-300 and i would like to put A330 into the new combobox cmbType in the above code.
I have worked out all the other bugs in my Staffing app. A while back .paul helped me with exporting my data to excel. So what I need to do now is this:
Schedule AM RN's and export to excel DONE Schedule PM RN's and export to excel appending to existing worksheet Schedule AM NT's and export to excel appending to existing worksheet Schedule PM NT's and export to excel appending to existing worksheet Schedule AM WC's and export to excel appending to existing worksheet Schedule PM WC's and export to excel appending to existing worksheet
I only need 1 workbook, and each new full schedule will be a new worksheet with the beginning date/ending date as the worksheet name.
Below is the code which I am using to append data to a text file. Dim FILE_NAME As String = "C:cebsample.txt" Dim objWriter As New System.IO.StreamWriter(FILE_NAME, True) Dim record As String Dim amount As Integer Dim amt As Decimal [Code] .... Now I would like to save that updated file with another name.
I am a newbie at VB.net and would like for you to review my code in order to improve its performance.My objective is to append a bunch of ".csv" files into daily data sets. Within a directory I have about 2500 individual text file (.csv). Each file represents minute intraday stock market data for an individual stock covering 5 days or one week of data. This means that each symbol has 1950 string lines..Here is an example of what a string line looks like: "2011-06-27,10:07,48.15,48.15,48.02,48.02,25421". Not that is relevant but these represent Date, time,Open, High, Low, Close & Volume. Since I have 2500 files within a directory; doing some math, I am processing 2500*1950 = 4,875,000 lines. This process takes me about 16 hrs to run.[code]
With the following code I can import comma delimited data from a text file into Excel.The problem is that I cannot seem to figure out how to append the data from the text file to an existing Excel file. (adding to a new row each time.)
With objExcel .Visible = True .Workbooks.OpenText(Filename:="c:scripts1New Text Document.txt", StartRow:=1, Tab:=True,
With the following code I can import comma delimited data from a text file into Excel.The problem is that I cannot seem to figure out how to append the data from the text file to an existing Excel file. (adding to a new row each time.)
With objExcel .Visible = True .Workbooks.OpenText(Filename:="c:scripts1New Text Document.txt", StartRow:=1, Tab:=True,
im added a dataset inside my project, and inside the dataset i added a DataAdapter with the steps like below:Use SQLStatement --> select A,B from tb_example --> Fill a datatable.And then i bind one of my combobox datasource's display member = Avalue member = BAnd its work properly!After few weeks, im reopen the project and i try to add another new dataadapter in the previous dataset and a new combobox like steps i did before. When i come to the combobox and try to find the datasource in combobox's properties and i cant find the dataadapter i jz added.
Im using visual studio 2008, i have created 2 webforms frm1 and frm2,,,i have a button in frm1 which i would like it to onclick populate textbox values to the other form(frm2)...
After I have retrieved my data from my access database, I would like to insert text into one of the columns in a new row. Is this possible? Here's a snipit of my code I use to retrieve the data from access:
If con.State = ConnectionState.Closed Then con.Open() sdr = cmd.ExecuteReader() rtime = Now()
[Code]....
It's the rtotal_time value that I need to insert into a new row, in and cell, the datagrid.
When i run this app., it shows all the data from my sql db now. How can I only need the previous 20 days data show from the sql db to the following ListView.
I have 2 applications that collect data every 5 minutes and imports that data into a SQL Server 2005 table. Every so often the location that I'm quering to get the data hasn't updated thier values so the application is trying to insert duplicate data into the database table. Because I have Primary Keys set on 2 of the 3 columns the insert fails which of course causes an error in my application.What I am needing to do is if it runs into a duplicate insert wait 1 minute or so and then retry running the download data Sub.Each sub calls the next sub in the process line.
I have 2 forms right now Form1 and Form2 the default setting start up is Form2. Inside Form 2 there was a button that will release the Form1 button using Form1.Show().[code]...
What is the code to open a text file and append data to it, in visual basic express edition?Normally one would write:open "data.txt" for append as #1 but visual basic express does not accept it.
I am a freshman by using vb and I had search several website to learn the method to display the previous saved data in a label but none of it is related to my problem.
I know its .net but i am still using ADODB this is just a sample table, not really what i am doing..I want to take a look at a bunch of records until the customer changes. then i want to have the previous recordset data displayed or passed off to another function how do i set RS2=RS but when i "movenext" RS RS2 still holds the previous record data? [code]
