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Vignesh Krishnan wrote: How to do reports in Visual Basic.
Like you would in any other language, I guess...
Seriously, it would depend on the tool you use, or you could write your own.
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There are a bunch of reporting packages out there, like SQL Reporting Services and Crystal Reports to name a couple. Exactly what you do is up to the package that you use.
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hai frnds
i m developing a web portal.
in that for a page i set the property "AutoPostBack=True" for few controls.
does there is any disadvantage for using this property for many times in a single page.
i mean, if page is postback to itself for several times in a single page
then is there any problem.
thanks in advance
vijay
devulapally_vijay@yahoo.co.in
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This question has nothing to do with VB.NET and everything to do with ASP.NET. You should be asking this question in the ASP.NET Forum[^].
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hai frnds
i m using Ms-access database as backend for my project.
i used the following code for retriving...
Dim con As New OleDbConnection("Provider=Microsoft.JET.OleDb.4.0;User Id=administrator;password=designstecpro;Data Source=D:/DataBaseBkp1-4/Master.mdb")
Dim da As New OleDbDataAdapter("select * from login", con)
Dim ds As New DataSet
da.Fill(ds, "login")
DataGridView1.DataSource = ds
but it is giving error like...
"Request for the permission of type 'System.Data.OleDb.OleDbPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed."
i set a password for my database.
when i remove the password for it then it is working fine....
can any one tell me wt would be the problem...
thanks in advance
vijay
devulapally_vijay@yahoo.co.in
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vijaylumar wrote: i m using Ms-access database as backend for my project.
i used the following code for retriving...
Dim con As New OleDbConnection("Provider=Microsoft.JET.OleDb.4.0;User Id=administrator;password=designstecpro;Data Source=D:/DataBaseBkp1-4/Master.mdb")
Dim da As New OleDbDataAdapter("select * from login", con)
Dim ds As New DataSet
da.Fill(ds, "login")
DataGridView1.DataSource = ds
but it is giving error like...
"Request for the permission of type 'System.Data.OleDb.OleDbPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed."
i set a password for my database.
when i remove the password for it then it is working fine....
can any one tell me wt would be the problem...
You need to add the user name / password to the connection string.
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hi,
try following connection string
connectionstring="Provider=Microsoft.jet.oledb.4.0;data source= D:/DataBaseBkp1-4/Master.mdb ;Jet OLEDB:Database Password=designstecpro"
i also doubt about path you specified
data source= D:/DataBaseBkp1-4/Master.mdb
is it desktop application ? if yes then
use backslash("\") in place of forward slash("/")
hope this helps
Rupesh Kumar Swami
Software Engineer,
Integrated Solution,
Bikaner (India)
My Company
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Hi
I'm trying to make an app that opens a file with excel in vb.net.
I'm trying to separate the text in a sheet with TextToColumns, but i'm stuck on how to do that. I have tested this but get an error that "TextToColumns method in the Range class has failed". Here's what I tried:
Private Sub btnOPEN_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnOPEN.Click<br />
<br />
OpenFD.ShowDialog()<br />
Dim strfilename As String<br />
strfilename = OpenFD.FileName<br />
<br />
Dim xlApp As Excel.Application<br />
Dim xlWorkBook As Excel.Workbook<br />
Dim xlWorkSheet As Excel.Worksheet<br />
Dim Range As Excel.Range<br />
<br />
xlApp = CreateObject("Excel.Application")<br />
xlApp.Visible = True<br />
<br />
xlWorkBook = xlApp.Workbooks.Open(strfilename)<br />
xlWorkSheet = xlWorkBook.ActiveSheet<br />
Range = xlWorkSheet.Range("a1", "a70")<br />
Range.Font.Bold = True<br />
Range.TextToColumns("a3", Microsoft.Office.Interop.Excel. _<br />
XlTextParsingType.xlDelimited, _<br />
Microsoft.Office.Interop.Excel.XlTextQualifier. _<br />
xlTextQualifierDoubleQuote, _<br />
True, True, False, True, True, False, False, _<br />
False, False, False, False) <br />
End Sub
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Member 4435051 wrote: Range.TextToColumns("a3", Microsoft.Office.Interop.Excel. _
XlTextParsingType.xlDelimited, _
Microsoft.Office.Interop.Excel.XlTextQualifier. _
xlTextQualifierDoubleQuote, _
True, True, False, True, True, False, False, _
False, False, False, False)
Looking at the docs on TextToColumns, you didn't specify the first arugment correctly. The method is looking for a Range object and you gave it a string ("A3") instead. I don't do Office interop, so this may be wrong, but I think you're looking for this or something very similar:
Range.TextToColumns(xlWorkSheet.Range("A3"), ...
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Thank's a lot.
This help is what I really needed.
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It did work great.
Thank's
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Hello Friends,
I am using datagrid to display records from access db. I got the first field as ID which is a primary key. As users should not edit it i made that column as read only in the datagrid but i need that column to be editable when users tries to add a new record(row). I am using windows forms (vb.net). Could anyone solve this issue?
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Member 3936356 wrote: I got the first field as ID which is a primary key. As users should not edit it i made that column as read only in the datagrid but i need that column to be editable when users tries to add a new record(row).
You really should not be allowing users to edit the primary key field. Assigning a primary key should be left up to the database, either by generating a key from entered data in a standardized format or by an autonumber.
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Hello Friends,
I am newbie when it comes to vb.net and i need to import excel sheet into access db using vb.net application. Here is the code i use for now to upload excel sheet and it works perfectly but i when i upload the file again it should include only the new records by checking the existence of ID field which i use as primary key. For now it pops up the message"Table Exists already".Could anyone help me pls?
Dim AccessConnection As New System.Data.OleDb.OleDbConnection
Dim _conn As String
Dim SchemaTable As DataTable
AccessConnection.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" & "Data Source=somefile.mdb"
AccessConnection.Open()
SchemaTable = AccessConnection.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Columns, New Object() {Nothing, Nothing, "mytable"})
If SchemaTable.Rows.Count <> 0 Then
MsgBox("Table Exists already" )
Else
Dim _filename As String = "myexcelsheet.xls"
_conn = "Provider=Microsoft.Jet.OLEDB.4.0;" & "Data Source=" & _filename & ";" & "Extended Properties=Excel 8.0;"
Dim _connection As OleDbConnection = New OleDbConnection(_conn)
Dim _command As OleDbCommand = New OleDbCommand
_command.Connection = _connection
Try
_command.CommandText = "SELECT * INTO [MS Access;Database=somefile.mdb].[accesstbname] FROM [Sheet1$]"
_connection.Open()
_command.ExecuteNonQuery()
MessageBox.Show("The Data Imported Successfully!")
Catch e1 As Exception
MessageBox.Show("Error!.Your Excel Spread Sheet has some problems.")
End Try
End If
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Member 3936356 wrote: _command.CommandText = "SELECT * INTO [MS Access;Database=somefile.mdb].[accesstbname] FROM [Sheet1$]"
In order to do what you want, you have to retrieve the data from the Excel sheet into a DataTable, iterate over the rows in the DataTable, verify that the row's ID is NOT already in the database, then execute an INSERT query to add the new row to the table if it' doesn't already exist.
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Thanks for you suggestions. But still as i am a newbie i donot have any idea about checking excel sheet rows against database unique id field and insert ones that does not exist. I expect some help in coding.
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Can someone please look at this and make some suggestions on how to improve the performance of this snippet this is killing one of our apps.
Private Function fbParseParameters(ByVal sArgs() As String) As Boolean
Dim tTemp As String
'
fbParseParameters = True
Dim iII As Integer = 0
If sArgs.Length > 0 Then
' each parameter is broken into a seperate array item.
While iII < sArgs.Length
tTemp = sArgs(iII).ToUpper
' look at the parms, and figure out which is which...
If tTemp.IndexOf("DATABASEHOST=") > 0 Then
myConnectionInfo.tDatabaseHost = tTemp.Substring(tTemp.IndexOf("=") + 1, _
(tTemp.Length - (tTemp.IndexOf("=") + 1)))
End If
If tTemp.IndexOf("USERNAME=") > 0 Then
myConnectionInfo.tUserName = tTemp.Substring(tTemp.IndexOf("=") + 1, _
(tTemp.Length - (tTemp.IndexOf("=") + 1)))
End If
If tTemp.IndexOf("USERNUMBER=") > 0 Then
myConnectionInfo.lUserNumber = tTemp.Substring(tTemp.IndexOf("=") + 1, _
(tTemp.Length - (tTemp.IndexOf("=") + 1)))
End If
If tTemp.IndexOf("PASSWORD=") > 0 Then
myConnectionInfo.tPassword = tTemp.Substring(tTemp.IndexOf("=") + 1, _
(tTemp.Length - (tTemp.IndexOf("=") + 1)))
End If
If tTemp.IndexOf("LOCALE=") > 0 Then
myConnectionInfo.tCurrentLocaleCode = tTemp.Substring(tTemp.IndexOf("=") + 1, _
(tTemp.Length - (tTemp.IndexOf("=") + 1)))
End If
If tTemp.IndexOf("LOCALEDESCR=") > 0 Then
myConnectionInfo.tCurrentLocale = tTemp.Substring(tTemp.IndexOf("=") + 1, _
(tTemp.Length - (tTemp.IndexOf("=") + 1)))
End If
If tTemp.IndexOf("MODULE=") > 0 Then
strApplicationInfo.tCurrentModule = tTemp.Substring(tTemp.IndexOf("=") + 1, _
(tTemp.Length - (tTemp.IndexOf("=") + 1)))
End If
If tTemp.IndexOf("REPORT=") > 0 Then
strApplicationInfo.tReport = tTemp.Substring(tTemp.IndexOf("=") + 1, _
(tTemp.Length - (tTemp.IndexOf("=") + 1)))
End If
If tTemp.IndexOf("CLIENT=") > 0 Then
strSystemInfo.lCurrentClient = tTemp.Substring(tTemp.IndexOf("=") + 1, _
(tTemp.Length - (tTemp.IndexOf("=") + 1)))
End If
If tTemp.IndexOf("COMPONENTNUM=") > 0 Then
strSystemInfo.lComponentNum = tTemp.Substring(tTemp.IndexOf("=") + 1, _
(tTemp.Length - (tTemp.IndexOf("=") + 1)))
End If
If tTemp.IndexOf("ISTHERAPY=") > 0 Then
Dim tTemp2 As String
tTemp2 = tTemp.Substring(tTemp.IndexOf("=") + 1, _
(tTemp.Length - (tTemp.IndexOf("=") + 1)))
If tTemp2 = "-1" Or tTemp2 = "0" Or tTemp2 = "1" Or tTemp2.ToUpper = "TRUE" Or tTemp2.ToUpper = "FALSE" Then
strSystemInfo.bIsTherapy = CBool(tTemp2)
End If
End If
If tTemp.IndexOf("PLANTYPE=") > 0 Then
strSystemInfo.tPlanType = tTemp.Substring(tTemp.IndexOf("=") + 1, _
(tTemp.Length - (tTemp.IndexOf("=") + 1)))
End If
If tTemp.IndexOf("GRIDMODE=") > 0 Then
strSystemInfo.tGridMode = tTemp.Substring(tTemp.IndexOf("=") + 1, _
(tTemp.Length - (tTemp.IndexOf("=") + 1)))
End If
If tTemp.IndexOf("HEADERNUMBER=") > 0 Then
strSystemInfo.lHeaderNum = tTemp.Substring(tTemp.IndexOf("=") + 1, _
(tTemp.Length - (tTemp.IndexOf("=") + 1)))
End If
If tTemp.IndexOf("DISCIPLINE=") > 0 Then
strSystemInfo.lDisciplineNum = tTemp.Substring(tTemp.IndexOf("=") + 1, _
(tTemp.Length - (tTemp.IndexOf("=") + 1)))
End If
If tTemp.IndexOf("THERAPISTNUM=") > 0 Then
strSystemInfo.lTherapistNum = tTemp.Substring(tTemp.IndexOf("=") + 1, _
(tTemp.Length - (tTemp.IndexOf("=") + 1)))
End If
iII += 1
End While
Else
fbParseParameters = False
Exit Function
End If
' We must at least have username, password, and database host in order to do anything...
If myConnectionInfo.tUserName = String.Empty Or _
myConnectionInfo.tPassword = String.Empty Or _
myConnectionInfo.tDatabaseHost = String.Empty Then
fbParseParameters = False
End If
End Function
Here is an example of the parm string
/DATABASEHOST=TEST/DATABASENAME=TEST /USERNAME=TEST /PASSWORD=TEST /LOCALE=GW /LOCALEDESCR=Glenwood /MODULE=CL /REPORT=TRMonthlyAttendance
Here is where it is loaded into the array
' must format these into an array ...
tParms = txtParm.Text.Split("/")
Dim iII As Integer
For iII = 1 To tParms.Length - 1
tParms(iII) = Trim("/" & tParms(iII))
Next
Humble Programmer
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You're using tTemp.Substring(tTemp.IndexOf("=") + 1 multiple times in each block. If you defined your search strings as constants, you could skip this. For example:
private const DATABASEHOST_ARG As String = "DATABASEHOST="
...
If tTemp.IndexOf(DATABASEHOST_ARG) > 0 Then
myConnectionInfo.tDatabaseHost = tTemp.Substring(DATABASEHOST_ARG.Length(), _
(tTemp.Length - DATABASEHOST_ARG.Length())
End If
I didn't compile, so formatting may be off - and make sure you check to see that I've got the Substring starting index correct. I'm pretty sure that the '+ 1' is no longer necessary.
Simply rinse and repeat for your other blocks and your helpful compiler should replace a lot of "IndexOf" operations with simple math!
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Thank you I will add that with some other things that I have done to it and that should help.
Humble Programmer
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Split the string with delimiter "/" into string array, then from there split with delimiter "=" then put the pair into HashTable.
Then assign your class from the HashTable (check for empty), ie
strSystemInfo.lTherapistNum = hashTable["THERAPISTNUM"].Value;
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In VB6 I used to use the following to automatically select an item in a listbox when a user types in a textbox:
[Module]
Public Declare Function SendMessage Lib "user32" _
Alias "SendMessageA" (ByVal hwnd As Long, _
ByVal wMsg As Long, ByVal wParam As Long, _
ByVal lParam As String) As Long
Public Const LB_SELECTSTRING = &H18C
...}
[Form]
Private Sub txtForLstAllUsers_Change()
If txtForLstAllUsers.Text <> "" Then
SendMessage lstAllUsers.hwnd, LB_SELECTSTRING, -1, txtForLstAllUsers.Text
End If
End Sub
I tried copying and pasting into a VB .Net application and I am getting the following error:
"hwnd is not a member of Systems.Windows.Forms.Listbox."
Also, I noticed there is no Change event for textboxes in .Net.
Can anyone tell me how to re-create this functionality in a .Net project?
Any help will be greatly appreciated!!
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I think the property is now Handle (lstAllUsers.Handle). And try the textbox's TextChanged event.
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Thanks for your response, JZ. I will give it a try.
I did, however, in the meantime find something that works rather well, in lieu of the listbox -
I used a combobox and selected "simple" as the combo type. That put the textbox right over a drop down that's visible; the control looking like a listbox with a textbox on top. I don't have the project in front of me, but I think I may have set another property for the combo that automatically auto selects when someone types in the textbox part of the combo.
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Hi There
This is my first post, I need help
I've a Datagridview filling from tbx and combobox, I want to put a Checkbox in each row (I don't how) so I want to delete a row checked from the datagridview
Please help, I very rookie
I'm doing this...
Public DRow As DataRow<br />
Public Carrito As New DataTable("Detalle")<br />
<br />
Sub Configuratabla()<br />
Dim DC0 As New DataColumn("Item", System.Type.GetType("System.Int64"))<br />
Dim DC1 As New DataColumn("Cantidad", System.Type.GetType("System.Int64"))<br />
Dim DC2 As New DataColumn("Detalle", System.Type.GetType("System.String"))<br />
Dim DC3 As New DataColumn("Valor", System.Type.GetType("System.Int64"))<br />
Dim DC4 As New DataColumn("Descuento", System.Type.GetType("System.Int64"))<br />
Dim DC5 As New DataColumn("Total", System.Type.GetType("System.Int64"))<br />
<br />
'DC4.Expression = "cantidad * Valor "<br />
With Carrito.Columns<br />
.Add(DC0)<br />
.Add(DC1)<br />
.Add(DC2)<br />
.Add(DC3)<br />
.Add(DC4)<br />
.Add(DC5)<br />
<br />
End With<br />
<br />
GrillaDetalle.DataSource = Carrito<br />
<br />
End Sub<br />
<br />
<br />
<br />
DRow = Carrito.NewRow()<br />
DRow(0) = Carrito.Rows.Count + 1 'Item<br />
DRow(1) = CInt(TbxCan.Text) 'Cantidad<br />
DRow(2) = CbxPro.SelectedItem 'Detalle<br />
DRow(3) = Valor1<br />
DRow(4) = CbxDes.SelectedItem 'Descuento<br />
DRow(5) = (CInt(TbxCan.Text)<br />
Carrito.Rows.Add(DRow)
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hi,
i hope that this can help you :
1-to add checkboxcolumn:
Dim mycolumn As New DataGridViewCheckBoxColumn
mydatagridview.Columns.Insert(0, mycolumn)
2-to delete row:
if mydatagridview.SelectedRows(i).Cells(0).Value=true then
mydatagridview.rows.removeat(indexofmayrow)
end if
Il principe 
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