VS 2010 How To Clear Data
Jan 25, 2012
This week I am doing a simple addition, multiplication calculator and am having a little problem clearing data and resetting the enter button. It is supposed to keep the add and multiplication buttons disabled till the user has entered two numbers into the list box, then you are able to choose between addition and multiplication. What I am trying to accomplish is once I hit the clear button the enter button becomes available again to enter numbers into the list box again and do the whole thing again.
'Author: Russell Thtch
'Instruction: Asieh Dicken
'Assignment: Ex.5.10 page 186
reating a web browser just for fun and am trying to show the favicon
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Jul 15, 2009
wan to ask about anyone know the code about how to clear all the data inside the data grid view without clear the binding source...
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Jul 24, 2010
i'm trying to come up with some code that can clear a database.
I've tried to loop the "delete" code that i have, tought each row in that database, but i get error at last row saying somethink like "row do not exist" and when i got back and look, there is still one record left in the database. Here is the code i used.
con.ConnectionString = "PROVIDER=Microsoft.Jet.OLEDB.4.0;Data Source =" & Application.StartupPath & "\Filmer.mdb"
con.Open()
[Code].....
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May 10, 2012
i want to clear listview. Everytime i refresh(filter my results e.g. ascending, decending) my listview data is appended to the listview. I want to clear the data in the listview before i add new data or do i need to clear the dataset that supplys the data e.g. im using access.[code]
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Jun 4, 2011
How can i clear my data table? I am using VB.Net as my front end MySQL as my Back end.
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Jan 15, 2012
how to clear the old data from the datagridview in vb.net.. the below code is retrieving the data from table and display in a gridview for particular person. but when i wanna check the next person record if he dosen't have record so the previous data still will not erased?
Dim c As New sqlStmt
c.myCon()
Dim da As New SqlDataAdapter("SELECT * FROM Experience WHERE CID='" &
[Code]....
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Feb 7, 2011
I'm working on an email application atm, and a main feature of it is that it allows someone to enter multiple email accounts and all of the emails will be aggregated on the one form. It would be quite easy to log out of each account if I could delete the cookies. I've tried looking in the "RoamingMicrosotWindowsCookies" folder, but there are no files at all in there, so I have no idea where the cookies would be going.
So, my question is, does someone have a function written that will delete all of the IE cookies currently in place? I can already clear the cache, but I really need to figure out how to delete the cookies.
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Nov 22, 2010
I just started learning programing if you can call it that, i had a class on visual basic a while ago and i managed to create a nice little application now i want to implement a menu button which when you click will erase all data in all textboxes
So i managed to create a buton but although i have found many answers to my question on the net not one code had worked for me, even the one from this forums faq doesn't work. If is probably coz i don't understand where to copy it or i am doing something wrong
I am using Windows Form Application I tried putting the code like this but obviously it doesn't work
Private Sub ClearEverthingToolStripMenuItem_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ClearEverthingToolStripMenuItem.Click
Dim ctl As Control
' Clear all the TextBoxes on the form.
[Code]..
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Jun 29, 2011
I'm trying to check a few accounts on a website using web requests. It stores the authentication cookies and the problem is i can't get it to "logout" so to speak. It needs to logout by clearing the cookies since you can't exactly "navigate" to the logout URL.I got a bunch of code but this is the cookie bit:
Dim TempCookies As New CookieContainer
Dim logincookie As CookieContainer
and...
[code].....
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Feb 24, 2009
Using MS Access 2003 I am trying to build a command button in a form which clears the contents of a table column (which are tick boxes) - the idea behind it is this - the database is a contacts database for a club. Every year there is a subscription to be paid, so I want a column to annotate those who have paid (using a tick box). At the end of the year this will be reset - hence the reason for trying to produce a command button that clears out the ticks. What I using is this ....Private Sub Command11_Click()Dim strSQL As StringstrSQL = "UPDATE TBL-Master SET TBL-Master.campaign = '';"DoCmd.RunSQL strSQLEnd Sub(TBL-Master is the table name, campaign is the column name)What I am getting is a runtime error - 3144 -
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Dec 13, 2011
this is currently my code to clear my 5 textboxes
Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click
TextBox1.Clear()
TextBox2.Clear()
TextBox3.Clear()
TextBox4.Clear()
TextBox5.Clear()
End Sub
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Apr 17, 2011
Does any one know how to clear all saved autofill data of browser in Asp.Net
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Jun 21, 2010
My below codes in a button click event populate data in the grid upon the user click the button.
1. How do I know that my commandtext did not find any matching data to popup the message to the user - No Records found.
2. How do I clear the data in the grid before executing the below codes.
--conection to SQL Server is opened
myadaptor.SelectCommand = New SqlCommand
myadaptor.SelectCommand.Connection = myconection
[code]....
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Mar 14, 2011
I am trying to clear current datagridview data source and then set a new one to it. But it doesn't clear the old one and the new one doesn't set unless i click run the code twice.I have tried different ways but none of them works here is the code i am trying:
[Code]...
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Feb 3, 2011
If my array is A(i,j) can I use Array.Clear to zero all of the elements for i=2, for example. It does not work as I expected.
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Jul 19, 2011
If my array is A(i,j) can I use Array.Clear to zero all of the elements for i=2, for example. It does not work as I expecte
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Nov 8, 2010
I'm using an array to populate a datagrid. I want a password protected button to be able to clear the data from the grid. I thought this would be fairly easy but so far it's not working. The following code doesn't generate any errors but the array still has data in it.
If txtPassword.Text = "bucswin" Then
Array.Clear(DataGridValues, 6, 23)
frmMain.DG1.Refresh()
[Code]....
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Mar 26, 2012
I currently have a chart that plots lines of a changing value every time it is called via a timer.
Everything is running as I expected and I am happy, but now I want to be able to press a [STOP] button which will stop the timer and stop the graph from updating, (which I have coded and is now working OK), BUT I then want the code under this [STOP] button to clear everything from the graph, so when I re-start the timer, the graph is cleared and starts plotting fresh points on a clean graph.
The problem I currently have is that when I press the [STOP] button and then press the [START] button, the new lines that get plotted are "added" to the existing lines that are already on the chart, instead of having a new "blank" chart, with no data on it.
So what I am really asking is does anyone know if it is possible to reset a chart clearing everything off it so it is ready to start displaying fresh data?
I was hoping it was something like: "Chart1.Clear" or something simple like that, but I can't seem to find anything that will do it.
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Dec 3, 2009
bare with me here ok I posted on here a while back, like month to 2 months ago about creating an array of data (user inputed data). But was suggested to go the class route. After weeks of lengthly reading came up with a list collection class.
[Code]...
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Dec 14, 2010
I am using Visual Basic under Visual Studio 2010 Professional and I selected .NET Framework 4 from the New Project Screen. The program will plot Strange Attractors and I need to set and/or clear pixels.I delcared the following
Declare
Function
SetPixel Lib
"gdi32"
[code]....
I can set pixels by using the following code, where intX and intY ade dimensioned as integer and &HFF00 is the Hexadecimal for red.
SetPixel(hDC, intX, intY, &HFF00)
After I finish plotting all the points I want to clear the screen back to all black or white or any predifined color. I was able to do this in earlier versions of Visual basic by using "CLS" but this is not available in the current version. how to clear the screen? Should I use one of the earlier versions (.NET Framework2.0, .NET Framework 3.0, etc, etc)?
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Nov 21, 2010
I am in need of a method that will clear all of Internet Explorer's cookies.
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May 17, 2009
I have a timer that runs every time by itself, and for the code the runs in it I would like to have it clear the dataset before it does anything, the timer runs every 10 seconds, so I tried to do dataset.clear but it would crash if the dataset had no values
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Jul 20, 2010
I have a button that inserts data into a database.With that button I want it to serve two functions.One for insert and one for clearing the textboxes after the insert is done.I did a little bit of digging around and her is a code snippet that i found online:
Dim ctrl As Control
For Each ctrl In Me.Controls
If TypeOf ctrl Is TextBox Then ctrl.Text = ""
[code].....
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Jun 22, 2009
Public
Class LoanCalc
Private Sub butCalc_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles butCalc.Click
'This procedure executes when the user clicks the Calculate
'button to produce a loan payment based on the requirements
'as stated in the service request.
'Variable Declarations
Dim douPrincipal As Double = Me.txtPrincipal.Text
Dim douInterest() As Double = {5.35, 5.5, 5.75}[CODE]......
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Sep 25, 2011
When I run the program it will populate the listview but when i delete the selected item it will clear all of my records in my listview. . . .can anyone elp me with this??This is my code. . . .
[Code]...
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Apr 28, 2011
After click the ok button all controls of displaying data should be clear in dataentry form. If i enter some data in the Combobox or Textbox for saving the data into the database, If i click the OK button all controls of displaying data should be clear, B`se i want to enter next record, so how can i do this?? Is there any Refresh Property is there?
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Jul 19, 2009
How i clear all data and not delete data or column in datagridview?
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Jun 23, 2011
in hyper teriminal when i press "ctrl+L" is to clear terminal screen how to write the code in vb.net? Hyperterminal is connecting to serial comport.when i try this it work and return line on debug
serialport.writeline ("at+cmgl=1")
i try this but not work and it still show some lines on debug
serialport.writeline (vbcrtl +"L")
serialport.WriteLine("vbCrLf + l")
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Mar 18, 2011
What I have is on my form there are several text boxes. These text boxes are for user input and attached to each text box is a Private Sub txtBox1_KeyPress function. In that function I have some validation code to check that the user is inputing only what I want them to. And if it doesnt it will pop up a message box telling them so, then it is supposed to clear the text box so the user can try again. But no matter what I try, the text box does not clear it still keeps the last character typed (the invalid one).
Here is the code for one of the text boxes.
Private Sub txtLanIp_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtLanIp.KeyPress
Dim strEmpty As String = ""
If Char.IsDigit(e.KeyChar) = True Or Char.IsPunctuation(e.KeyChar) = True Or Char.IsControl(e.KeyChar) = True Then
'do nothing
[code]....
The commented methods at the bottom are some of the other things ive tried to make this work. The txtLanIp.text.clear() is what ive tried from the beginning. I have also tried setting the text to "", I even created an empty string and set the .Text value to it but no matter what it wont remove that character. I have also tried various trim(), len(), Select() functions, most either give me an 'index out of range error', a 'length cannot be less than zero' error or a general ExceptionOutOfBounds error. I am just tearing my hair out as to why the simple way doesnt work, there is no logical reason why and it gives no error it just doesn't clear the box.
I have also tried moving the validation to a _LostFocus but e.KeyChar isnt a valid method or property for that declaration, which doesn't surprise me but I wanted to try everything.I dont see how it would matter in this case but I am running Windows XP Pro SP3, though I also see the same behavior in Windows 7 64 bit ultimate sp1 and windows 7 64 bit pro.
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Dec 29, 2011
When .Clear() is invoked, is the memory freed up that was allocated when all of the items were added? I need to load several lists of codes from a database depending on the import selected by the user. Each list of codes will be a List(Of String). My idea is that I will load only small strings into a List(Of String) along with a List(Of <class>) for the data I will be validating and manipulating. When I am done, I want all of the data from the Lists to be purged from memory. Will .Clear() take care of that or does the memory still remain allocated and have to be dumped by the OS once memory gets full? (And, incidentally, what causes the OS to decide which memory blocks to dump? FIFO concept?)
There are so many lists, I'm not sure if I just want them sitting in memory or not. Granted, the lists will just consist of a single string value for each code pulled from the database. So there won't be a ton of data, so maybe I could just load all the validation lists at the beginning of runtime and only worry about purging the data List since it will contain between 35-50 "fields" per record and there will be a couple thousand records each import that is run. I don't want my program to actually cause a hit in performance in the long run. I ultimately don't see a problem because I won't be running millions or even hundreds of thousands of records at once, but I just want to be sure.
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