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What is the exact use of delegate?? Someone Tell me in simple way.
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Hi to all. I want some basic VB tutorials for start.Thanks.
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Try this link[^]
=========================================================
I'm an optoholic - my glass is always half full of vodka.
=========================================================
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You mean VB6?
If yes,
why? VB6 is dead(still few zombies alive). Go with VB.NET. Download Visual studio express edition[^] & start learning.
But still you want VB6 things? Then go here. http://www.thevbzone.com/[^]
-------------------------------------------
If No,
Use Google search for tutorials. Codeproject has a section for VB.NET[^]
-------------------------------------------
And Education Needed[^]
thatrajaCode converters | Education Needed
No thanks, I am all stocked up. - Luc Pattyn
When you're wrestling a gorilla, you don't stop when you're tired, you stop when the gorilla is - Henry Minute
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hi there,
how to develop a barcode generator in vb.net 2008 in windows forms
please help me out am really in need for this 
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Hi I am working with Visual Basic application on one of my data logging unit in which data speed is 1000 sample per second the data logging unit will run for one or two complete day. Which means for one day data amount will be 86400000 samples can easily be stored in below buffer. Or partially after 2-3 hr data can automatically save to selected drive.
How I can save data above data in excel format. Or which is the best way to store data. Below is my buffer in which data get store:
Dim DataSet(0 To 1000000000) As String
Public Sub OnRead(ByVal pHandle As Integer)
If StartLogging = 1 Then
Time(SamplePerSecond) = TimeValue / 1000
DataNo = DataNo + 1
DataSet(DataNo) &= TimeValue / 1000 & vbTab & (Int((CH1_RawADC - CH1_Tare) * CH1_CalibrationFactor) / CH1_DP)
End If
End Sub
Himanshu
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If you need to save it so it can be read by Excel, I'd say at the end of the sampling period, write the dataset to a CSV (comma separated value) file.
A quick check of my Excel (Office 2010) shows a maximum row count of a little over 1,000,000.
Since you expect 86,000,000 samples, you will have to have 86 or more samples per row.
Hope that helps.
Tim
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Hi Thanks for your replay. It is quick way to store data in this CSV format but main disadvantage is "lot of file is created". Excel got one advantage that new sheets can be open with in one file.
Yet now I am able to open excel file and export data to different sheet but because of big no of sample Excel keep on working for about some minutes. So I am looking to do it in fast way.
If this can done it will be great. Using CSV with 1,000,000 row limit and than work with 2sheet of same CSV file?
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Store the data in a format that allows you to write fast. DON'T try to store samples directly in an Excel sheet. Excel interop is way too slow for that.
You do the conversion to Excel after the samples are collected.
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As I gone through some search. If data amount is big than one should used TDMS format is someone use this before and how to incorporate with VB
http://www.ni.com/white-paper/3727/en/
Traditional Approaches to Measurement Data Storage
modified 18-Dec-13 3:11am.
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You can use whatever format you want, so long as you're not spending any kind of time doing any processing of the data or work to format the data how you want. The priority here is to write the data as fast as possible so you don't bog your code down and lose samples.
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Hi all,
I want to create an Income and Expenditure Statement in Crystal Report (I am using VB.NET 2010, MySQL and Crystal Report with XML datasource). I have two different tables namely
1. income
2. expenditure
Structure of income table is...
--------------------------------------------------------------
| ID | IncomeDate | Details | IncomeAmt |
-------------------------------------------------------------
| a1 | 2/12/2013 | Sale to Mr. ABC | 34,000.00 |
| a2 | 3/12/2013 | Sale to Mr. DEF | 14,000.00 |
| a3 | 4/12/2013 | Sale to Mr. IJK | 22,500.00 |
| a4 | 5/12/2013 | Sale to Mr. LMN | 1,500.00 |
| a5 | 6/12/2013 | Sale to Mr. OPQ | 9,235.00 |
| a6 | 7/12/2013 | Sale to Mr. RST | 66,000.00 |
--------------------------------------------------------------
In the above table Mr. ABC, DEF, IJK are all different customers.
and Structure of expenditure table is
--------------------------------------------------------------
| ID | ExpDate | Details | ExpAmt |
--------------------------------------------------------------
| b1 | 1/12/2013 | Purchase from ABC | 34,000.00 |
| b2 | 10/12/2013 | Purchase from DEF | 14,000.00 |
| b3 | 11/12/2013 | Purchase from IJK | 22,500.00 |
| b4 | 16/12/2013 | Purchase from LMN | 1,500.00 |
| b5 | 26/12/2013 | Purchase from OPQ | 9,235.00 |
| b6 | 27/12/2013 | Purchase from RST | 66,000.00 |
--------------------------------------------------------------
In the above table ABC, DEF, IJK are all different distributors.
The above tables are completely different although the structures are almost same. But data is different.
I want to create the report...
---------------------------------------------------||---------------------------------------------------
| ID | IncomeDate | Details | IncomeAmt | || ID | ExpDate | Details | ExpAmt |
---------------------------------------------------||---------------------------------------------------
| a1 | 2/12/2013 | Sale to Mr. ABC | 34,000.00 | || b1 | 1/12/2013 | Purchase from ABC | 34,000.00 |
| a2 | 3/12/2013 | Sale to Mr. DEF | 14,000.00 | || b2 | 10/12/2013 | Purchase from DEF | 14,000.00 |
| a3 | 4/12/2013 | Sale to Mr. IJK | 22,500.00 | || b3 | 11/12/2013 | Purchase from IJK | 22,500.00 |
| a4 | 5/12/2013 | Sale to Mr. LMN | 1,500.00 | || b4 | 16/12/2013 | Purchase from LMN | 1,500.00 |
| a5 | 6/12/2013 | Sale to Mr. OPQ | 9,235.00 | || b5 | 26/12/2013 | Purchase from OPQ | 9,235.00 |
| a6 | 7/12/2013 | Sale to Mr. RST | 66,000.00 | || b6 | 27/12/2013 | Purchase from RST | 66,000.00 |
---------------------------------------------------||---------------------------------------------------
I have 3 options.
1. Join two tabels using mysql join/union/union all or other possible commands,
2. Create two XML files of two different tables and merge them,
3. Crystal Report DataSource has two different XML tables.
I tried all, but failed.
my code for option 1 is...
Try
OpenConnection
Dim sb As New StringBuilder
sb.Append("SELECT * FROM income WHERE income.IncDate BETWEEN '" & DateFrom & "' AND '" & DateTo & "' UNION SELECT * FROM expenditure WHERE expenditure.ExpDate BETWEEN '" & DateFrom & "' AND '" & DateTo & "'")
Dim dbcommand As New MySqlCommand
Dim dbadapter As New MySqlDataAdapter
Dim stdata As New DataSet()
dbcommand.Connection = conn
dbcommand.CommandText = sb.ToString
dbadapter.SelectCommand = dbcommand
dbadapter.Fill(stdata)
stdata.WriteXml(Application.StartupPath & "\ReportXml\IncomeExpenditure.xml", XmlWriteMode.WriteSchema)
Catch ex As Exception
MsgBox(ex.Message)
End Try
and for option 2 is...
Try
Dim sb As New StringBuilder
sb.Append("SELECT * FROM income WHERE IncDate BETWEEN '" & DateFrom & "' AND '" & DateTo & "'")
Dim dbcommand As New MySqlCommand
Dim dbadapter As New MySqlDataAdapter
Dim stdata As New DataSet()
dbcommand.Connection = conn
dbcommand.CommandText = sb.ToString
dbadapter.SelectCommand = dbcommand
dbadapter.Fill(stdata)
stdata.WriteXml(Application.StartupPath & "\ReportXml\Income.xml", XmlWriteMode.WriteSchema)
Catch ex As Exception
MsgBox(ex.Message)
End Try
Try
Dim sb1 As New StringBuilder
sb1.Append("SELECT * FROM expenditure WHERE ExpDate BETWEEN '" & DateFrom & "' AND '" & DateTo & "'")
Dim dcommand As New MySqlCommand
Dim dadapter As New MySqlDataAdapter
Dim sdata As New DataSet()
dcommand.Connection = conn
dcommand.CommandText = sb1.ToString
dadapter.SelectCommand = dcommand
dadapter.Fill(sdata)
sdata.WriteXml(Application.StartupPath & "\ReportXml\Expenditure.xml", XmlWriteMode.WriteSchema)
Catch ex As Exception
MsgBox(ex.Message)
End Try
Dim Table1 As New XmlTextReader(Application.StartupPath & "\ReportXml\Income.xml")
Dim Table2 As New XmlTextReader(Application.StartupPath & "\ReportXml\Expenditure.xml")
Dim XmlDataSet1 As New DataSet
Try
XmlDataSet1.ReadXml(Table1)
Dim XmlDataSet2 As New DataSet
XmlDataSet2.ReadXml(Table2)
XmlDataSet1.Merge(XmlDataSet2)
XmlDataSet1.WriteXml(Application.StartupPath & "\ReportXml\IncomeExpenditure.xml", XmlWriteMode.WriteSchema)
Catch ex As Exception
MsgBox(ex.Message, MsgBoxStyle.Critical, "Error!!!")
End Try
But not getting my expected result. I tried to find the solutions in the internet but everywhere I found, at least one matching column should be there to join/merge. But I want to simply join these two tables side by side. One more thing to do. I want to show the result filtering between two dates.
What should I do ?
Biplob.
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Option 4 Create 2 sub reports with the same date parameters and forget about merging/union etc.
Never underestimate the power of human stupidity
RAH
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Thank you Holmes, your single sentence gave my answer. I tried it and somewhat successful. If there is any problem, I will definitely inform you.
Thanks again.
Regards,
Biplob
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How about something like Option #2, but in a Temp table.
Something like
SELECT xdate,description,income_amt Into #Temp1
Union
SELECT xdate,description,exp_amt Into #Temp1
(Apply the correct field names for your solution)
This way, you have a merged table which you can sort by date and generate your report.
My 2 cents.
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Option 2 without the merge. Use subreports in Crystal Reports, one for income and one for expenses. This also allows you to put the tables side by side. The only disadvantage might be if you want to show a net profit/loss, though this could be handled easily by pre-calculating and passing in as a formula field.
"Go forth into the source" - Neal Morse
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I Need to load data from SQL server. i wrote this. Can anyone help me please.
I have:
txt.ID
txt.Name
txt.Adress (as textboxes)
cbDept (as a combobox)
The textboxes stays empty. and in the combobox i get the ID, and in the combobox i need to get the name.
Private Sub cmdRequery_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdRequery.Click
DBRequery()
Me.BindingContext(_DataSet.Tables(0)).CancelCurrentEdit()
Me.BindingContext(_DataSet.Tables(0)).Position = 0
RefreshData(True)
End Sub
Private Sub DBRequery()
cmdSave.Enabled = False
_DataSet.Clear()
Try
_DataAdapter.Fill(_DataSet)
Catch Eror As Exception
cmdAdd.Enabled = False
cmdUpdate.Enabled = False
cmdDelete.Enabled = False
MsgBox(Eror.Message, MsgBoxStyle.Exclamation, "Error Opening Database")
Close()
Exit Sub
End Try
txtCount.Text = Format(_DataSet.Tables(0).Rows.Count, "#,##0")
If _DataSet.Tables(0).Rows.Count > 0 Then
txtCurrent.Text = "1"
EnableNavigation()
End If
cmdAdd.Enabled = True
End Sub
Thank you 
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I wrote this on form load. But none of them is working.
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim strconnection As String = "Data Source=ELIANE-VAIO\SQLEXPRESS;Initial Catalog=DatabaseConnection;Integrated Security=True;"
Dim _cn As SqlConnection = New SqlConnection(strconnection)
_cn.Open()
cmd.Connection = _cn
_DataAdapter.SelectCommand = New SqlCommand("SELECT * FROM tblCustomer", _cn)
Try
_DataAdapter.Fill(_DataSet)
Catch eror As Exception
MsgBox(eror.Message)
End Try
cbDept.DataSource = _DataSet.Tables(0)
cbDept.DisplayMember = "Namee"
cbDept.ValueMember = "DeptID"
Me.txtName.Text = ""
txtName.DataBindings.Add("text", _DataSet.Tables("tblCustomer"), "Name")
txtEmail.DataBindings.Add("text", _DataSet.Tables(0), "Email")
txtAddress.DataBindings.Add("text", _DataSet.Tables(0), "Address")
cbDept.DataBindings.Add("text", _DataSet.Tables(0), "Namee")
End Sub
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Member 10388494 wrote: I wrote this on form load. But none of them is working.
Which "them"? And what do you mean by "not working"? Does it throw an error, does it show a blank form?
Put a breakpoint after that try, and hover the mouse over the word "_DataSet" to inspect it's values; see if there are records in the dataset. If not, verify whether you're selecting from the correct database.
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
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Private Sub BindingContext_Load(sender As Object, e As EventArgs) Handles Me.Load
Dim strconnection As String = "Data Source=ELIANE-VAIO\SQLEXPRESS;Initial Catalog=DatabaseConnection;Integrated Security=True;"
_cn = New SqlConnection(strconnection)
Dim da As New SqlDataAdapter("select * from tbldept", _cn)
Dim ds As New DataSet
da.Fill(ds, "tbldept")
cbDept.DataSource = Nothing
cbDept.Items.Clear()
cbDept.DataSource = ds.Tables("tbldept")
cbDept.DisplayMember = "namee"
cbDept.ValueMember = "deptid"
If cbDept.Items.Count <> 0 Then
cbDept.SelectedIndex = 0
cbDept.SelectedValue = 0
cbDept.Text = ""
End If
ds.Dispose()
da.Dispose()
_DataAdapter = New SqlDataAdapter("select * from customervw", _cn)
_DataAdapter.Fill(_DataSet)
txtName.DataBindings.Add("text", _DataSet.Tables(0), "Name")
txtEmail.DataBindings.Add("text", _DataSet.Tables(0), "Email")
txtAddress.DataBindings.Add("text", _DataSet.Tables(0), "Address")
cbDept.DataBindings.Add("text", _DataSet.Tables(0), "Namee")
txtserial.DataBindings.Add("text", _DataSet.Tables(0), "serial")
txtCount.Text = _DataSet.Tables(0).Rows.Count
End Sub
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Hello guys. I need your help Please. I have this code.
Private Sub cmdDelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdDelete.Click
BindingContext(_DataSet.Tables(0)).RemoveAt(BindingContext(_DataSet.Tables(0)).Position)
txtCount.Text = CStr(CInt(txtCount.Text) - 1)
RefreshData(True)
cmdSave.Enabled = True
End Sub
I want to delete a record from my database.
The record is being removed from the form. but not from the database.
Any suggestion?
Thank you
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That is because you are doing only half the job, you update the datasource collection but nowhere do you delete the record from the database. Whatever you are using as a tutorial/book/learning aid should have this information. It is impossible to guess your DAL methodology.
Never underestimate the power of human stupidity
RAH
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