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ceraative wrote:
i have to do a calculator that paints graphs.
Sounds a lot like homework to me.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Then you will have covered everything you need to do this in the course materials. Am I right?
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Then who should you REALLY be asking a question like this?
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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hi everybody
does anbody know how can i dial a number with the modem in vb .net & when the phone picked up, a sound file play for user?
tank you guys so much
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Only if your have a modem that supports TAPI. A normal modem won't do it.
On top of that, you'll need a library that wraps a version of TAPI. You can find one on GotDotNet.com.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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I have an array of mixed data Integer and string in a variable array I wish to pass to a datagrid, but all the information I find reletes to the use of datagrids with Datasets and datatables. Is it possible to pass data from a two dimensional Array to a replicated image in a datagrid ie col1, rwo 1 to col1 row 1?
I'm really new at this. Can anyone help?
Dim X as single
Public Dat_Arr(1, 20)as variantType
me.DataGrid1.DataSource.= Dat_Arr????
DPF
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Are you looking for:
DataGrid1.DataSource = Dat_Arr
You'd much better off moving your data to a DataTable object. You'll get alot more flexibility.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Cheers Dave, I'll try this read up on datatables too.
DPF
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hi everybody
does anbody know how can i send fax via vb .net?
any free components or something?
tank you guys so much
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You can user winfax services and winfax assemble to develop a simple fax application
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Hello 
I've got two DataGrids, both with a scrollbar. Now I will that datagrid2 automatically scroll with the datagrid1. You can see this effect in word, when two documents are open on the same window...
I've not found any possiblity to set the scrollbar position 
Any idea?
Greetings from switzerland,
BuddelWilli
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Ok, I've got the solution:
'http://www.sys-con.com/dotnet/article.cfm?id=454
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Hi all of you
I am student , and our supervisor ask us to make a short course registration system, but i couldn't do the following
(The user is allowed to attempt to log-in to course database a maximum of 3 times in a session. If they fail to log in after 3 attempts, they are prevented from logging into the session from this or any other terminal.
If the user-id is not recognized at all, the terminal is frozen for 5 minutes.
If the user-id is recognized but the password isn't, the student record is 'locked' for the full session.
In either type of log-in failure, the attempt is logged on a fault logging database. If the log-in is successful the student is added to the session's attendance list.
If the login is successful, the student's attendance record for the whole course is updated).
plz, i need your help because i am vb.net beginner
thankx
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hello sara, there r many problems but there have easy way to solve it, i mean there have now good database management systems like oracle 9i,so programmers no need to waist there time to make above things,that above your question covers the ORACLE 9i database system very easily,only need to put values,if u can find the oracle 9i database administrator fundamental 1 book u ll meet the 14 th chapter,its easy to understand
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Dear rajith2005,
Thank you very much for your suggestion, but the supervisor ask us to do it using ado.net and vb.net , i want to use sql server as database, but really i don't know how to lock and unlock recorde, or what does mean by the terminal is frozen for 5 minutes.
thank you
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dear sara, u welcome
ik now wht u mean,bt i just get oracle to do it,cuz me doin OCA these days ,its easy .i dnt know much abt VB.NET even,bt i try to help u,ill ask it my friend,bye
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hi
its might not be a good solution but might help.
what u have to do is add a field in the USER_INFO_TABLE named ACCOUNT_STATUS and have a variable in the form LOGIN_TRY. set the LOGIN_TRY to zero on form load event and on every fail attempt add one to it. when LOGIN_TRY=3 then set the ACCOUNT_STATUS to Disable and close the form.
when ever the form is load its should checked the status of ACCOUNT_STATUS and if it is ok let the user try to login else reject it.
to do the second thing have a Variable (Above Variable can also be used if coded carefully.) and set it values to zero on form load event then when invalid id is enter increment its value. when its has a value of 3 enable a timer with value set to five mins and disable all the control on the form so its forzen (what i understand the application will be runing in full screen mode). in timer event(didn't remember what has been a while sine i coded in VB.net might be tick or somethinglike that) enable the form controls and disable the timer after five mins the event will fire and its was start inputing again.
ur thirds problem is autoslove when u do the first thing.
hopefully it will work.
Allah Hafiz
Computer...  Programming... What That
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Dear Bad Sector,
Thank you very much
I will try it now
best regards
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OK, I'm working on a project and I have come stuck on one important feature of my application. A brief backgroud is that this is a trading application, my problem/question comes when I try replace the MS FlexGrid with the DataGrid. I am trying to acheive the same effect with this function using the datagrid, but I just cant seem to get it work correctly, here are the methods:
'================================================================================
' Public Methods
' ===============================================================================
'--------------------------------------------------------------------------------
' Adds the market depth row to the book
'--------------------------------------------------------------------------------
Public Sub updateMktDepth(ByVal tickerId As Integer, ByVal rowId As Long, ByVal marketMaker As String, _
ByVal operation As Long, ByVal side As Long, ByVal price As Double, ByVal size As Long)
Dim bookentry As String
bookentry = marketMaker & vbTab & price & vbTab & size & vbTab & "0.0" & vbTab & "0"
If operation = OPERATION_INSERT Then
If side = BID Then
grdBidBookEntries.AddItem bookentry, rowId + 1
Else
grdAskBookEntries.AddItem bookentry, rowId + 1
End If
ElseIf operation = OPERATION_UPDATE Then
If side = BID Then
grdBidBookEntries.RemoveItem rowId + 1
grdBidBookEntries.AddItem bookentry, rowId + 1
Else
grdAskBookEntries.RemoveItem rowId + 1
grdAskBookEntries.AddItem bookentry, rowId + 1
End If
ElseIf operation = OPERATION_DELETE Then
If side = BID Then
grdBidBookEntries.RemoveItem rowId + 1
Else
grdAskBookEntries.RemoveItem rowId + 1
End If
End If
' recalc the average cost and cumulative size
Call UpdateLists
End Sub
________________________________
'--------------------------------------------------------------------------------
' Flush the deep book
'--------------------------------------------------------------------------------
Private Sub Form_Load()
Dim bookentry As String
' flush the book entries and add the column headers
grdAskBookEntries.Clear
grdBidBookEntries.Clear
bookentry = "MM" & vbTab & "Price" & vbTab & "Size" & vbTab & "cumSize" & vbTab & "avgPrice"
grdAskBookEntries.AddItem bookentry
grdBidBookEntries.AddItem bookentry
End Sub
Private Sub UpdateList(ByVal lstBookEntries As MSFlexGrid)
' need to recalc the cum
Dim val As String
Dim size As Integer, cumSize As Integer
Dim price As Double, totalPrice As Double
Dim iLoop As Integer, jLoop As Integer
For iLoop = 1 To lstBookEntries.Rows - 1
'Calculate the cumulative size & average price
cumSize = 0
totalPrice = 0
For jLoop = 1 To iLoop
lstBookEntries.row = jLoop
lstBookEntries.Col = 1
price = lstBookEntries.Text
lstBookEntries.Col = 2
size = lstBookEntries.Text
cumSize = cumSize + size
totalPrice = totalPrice + (price * size)
Next jLoop
lstBookEntries.row = iLoop
lstBookEntries.Col = 3
lstBookEntries.Text = cumSize
lstBookEntries.Col = 4
lstBookEntries.Text = Round((totalPrice / cumSize), 4)
Next iLoop
End Sub
___________________________________________________
P.S Market Depth just shows the best 10bids and the best10 offers, when I try to implement the same using a datagrid, it does not disply correctly, any suggestions welcomed!
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The ListView and DataGrid controls don't understand Tabs, and there is really no "cell" like in a MSFlexGrid either.
Also, you're keeping your working data inside the control itself. Don't. Keep your working data in seperate arrays, DataTables, hash tables, what have you, and use the controls for visual presentation of that data.
In your case, I would recommend using a DataTable or a set of DataTables in a DataSet. You will then have much more flexibility using the DataGrid to display and edit your data.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Thanks for the feedback, I have sort of "accidently" come to the same conclusion with the use of the DataGrid!
Regards
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I have a password on my windows form application, and I want it to expire after like 10 minutes of the program being inactive, and force the user to enter it again. Does anyone know how to do this efficiently? I tried a few ways but they all pretty much had a procedure running constantly in the background which kind of slowed stuff down. What do you think would be the most efficient way to do this?
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What kind of procedure - have you tried using a System.Timers.Timer ??
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