IsDBNull

        If IsDBNull(DataGridView1.CurrentRow.Cells(0).Value) Then
            txtKd_Aktiva.Text = ""
            txtKd_Dept.Text = ""

        Else
            txtKd_Aktiva.Text = DataGridView1.CurrentRow.Cells(0).Value
            txtKd_Dept.Text = DataGridView1.CurrentRow.Cells(1).Value
        End If

ToolStrip Collect Command

-- save
    Private Sub SaveToolStripButton_Click(sender As Object, e As EventArgs) Handles SaveToolStripButton.Click
        Dim frm As Object = Me.ActiveMdiChild
        If frm Is Nothing Then Return
        Call frm.save()
    End Sub

--delete

    Private Sub DeleteToolStripButton_Click(sender As Object, e As EventArgs) Handles DeleteToolStripButton.Click
        If MsgBox("Are you sure want to Delete?", MsgBoxStyle.YesNo, "Delete") = MsgBoxResult.Yes Then
            Dim frm As Object = Me.ActiveMdiChild
            If frm Is Nothing Then Return
            Call frm.delete()
        Else
            MsgBox("You aren't deleted")
        End If
    End Sub

--filter
    Private Sub FilterToolStripButton_Click(sender As Object, e As EventArgs) Handles FilterToolStripButton.Click
        Dim frm As Object = Me.ActiveMdiChild
        If frm Is Nothing Then Return
        Call frm.Filter()
    End Sub

Convert Dbf to MySQL

Step by step for convert Dbf to MySql

1. Convert Dbf to Xls with Foxpro command. Example for copy file ledger.dbf to ledger.xls, you can used this script "Copy to ledger type xls".
2. Convert Xls to Mdb Online with zamzar.com.
3. Convert Mdb to Sql with MySQL Migration Toolkit.
4. Create table ledger in database  MySql.
5. Import table from step 3.

Microsoft Report Viewer with MySQL - VB.net

You can see this tutorial at youtube :

Part 1 :
http://www.youtube.com/watch?v=tuwZNSwTjEI

Part 2 :
http://www.youtube.com/watch?v=-Ic64qxWf0k

RDLC Reporting Example

If you want create RDLC Reporting example, you can see in youtube :

http://www.youtube.com/watch?v=NVImPdRbVAs

Rdlc

Rdlc, yes. This name for pure report from Visual Studio.

Report Designer (Visual Studio)

The Visual Studio Report Designer provides a user-friendly interface for creating robust reports that include data from multiple types of data sources.

In Visual Studio, reports are saved as client report definition (.rdlc) files. These files are based on the same schema as report definition (.rdl) files published on SQL Server Reporting Services report servers, but they are stored and processed differently than .rdl files. At run time, the .rdlc files are processed locally, and the .rdl files are processed remotely.

Source : http://msdn.microsoft.com/en-us/library/bb558708.aspx

SAP Crystal Reports, developer version for Microsoft Visual Studio - 2012 Now Available for Download

New In This Release

        New branding for the product; 
      Now called “SAP Crystal Reports, developer version for Microsoft Visual Studio”

    

      Support integration with Visual Studio 2012 and 4.5 .NET Framework runtime.

        Added support for following platforms:

a.        OS:  Windows 7 SP1, Windows 8, Windows 2012

b.       Database: SQL Server 2012, HANA SP5

c.        Web Browser:  Firefox 16, IE10 (limited support; more information forthcoming soon)

d.       Other technology: IIS 8, Flash 11

Download Locations

SAP Crystal Reports, developer version for Microsoft Visual Studio SP5

SAP Crystal Reports, developer version for Microsoft Visual Studio SP5 - MSI (32bit)

SAP Crystal Reports, developer version for Microsoft Visual Studio SP5 - MSI (64bit)

SAP Crystal Reports, developer version for Microsoft Visual Studio SP5 MSM (32 bit only)

SAP Crystal Reports, developer version for Microsoft Visual Studio SP5 ClickOnce Redist (.zip download)

SAP Crystal Reports, developer version for Microsoft Visual Studio SP5 - built-in Visual Studio ClickOnce “Homesite” location (32 bit)

SAP Crystal Reports, developer version for Microsoft Visual Studio SP5 - built-in Visual Studio ClickOnce “Homesite” location (64 bit)

PLEASE NOTE:

Any queries, issues, problems, etc., should be posted as a Discussion in the SAP Crystal Reports, version for Visual Studio Space. Queries posted as Comments will not be answered.

Source : http://scn.sap.com/docs/DOC-35074

Insert, Update

Insert :
Insert myTable(myField1, myField2,myField3) values ('Value1','Value2','Value3')

Update :
Update myTable set myField = newValue where myKey = myKeyField

SaveToolStripButton

Save with SaveToolStripButton

    Private Sub SaveToolStripButton_Click(sender As Object, e As EventArgs) Handles SaveToolStripButton.Click
        Dim frm As Object = Me.ActiveMdiChild
        If frm Is Nothing Then Return
        Call frm.save()
    End Sub

In form mdiChild

Public Class frmChangePassword
    Public Sub Save()
        Dim Query As String
        Dim sDB = New sqlDB
        Query = "insert  jnsbrg(kelomp_brg,nm_jns_brg) VALUES ('"
        Query = Query + txtKelomp_Brg.Text + "','" + txtNm_Jns_Brg.Text + "')"
        sDB.executeSQL(Query)
        MDIParent1.SaveToolStripButton.Enabled = False
        MDIParent1.NewToolStripButton.Enabled = True
    End Sub
End Class

Standardized Naming Conventions for Visual Basic .NET

When you’re programming, names are important. If you’re programming with Visual Basic .NET, the following table can be a major help in getting the names right. It gives the common prefix to use when naming objects so you can quickly tell your check boxes from your combo boxes and your radio buttons from your record sets.

Prefix	Corresponding Object	Example	Prefix	Corresponding Object	Example
Acd	ActiveDoc	AcdMainPage	Hpl	HyperLink	HplURL
Chk	CheckBox	ChkBoldface	Lbl	Label	LblContents
Cbo	ComboBox	CboDropper	Lst	ListBox	LstNames
Cm	ADO command (database)	CmMyCommand	Pag	Page	PagTurn
Cmd	CommandButton	CmdExit	Pgf	PageFrame	PgfRule
Cmg	CommandGroup	CmgSelectOne	Prj	ProjectHook	PrjSuzerine
Cn	Connection (database)	CnMyConnex	Rb	RadioButton	RbBlueBackground
Con	Container	CntFramed	Rs	Recordset (database)	RsTotalSales
Ctr	Control	CtlSeeThis	Sep	Separator	SepZone
Fld	Field (database)	FldTitles	Spn	Spinner	SpnWatch
Frm	Form	FrmColors	Txt	TextBox	TxtAddress
Frs	FormSet	FrsTypeIn	Tmr	Timer	TmrAnimation
Grd	Grid	GrdGoods	Tbr	ToolBar	TbrDropThis
Grc	Column (in grid)	GrcQuantity	Tbl	Table (database)	TblTitles
Grh	Header (in grid)	GrhYearsResults

Source : http://www.dummies.com/how-to/content/standardized-naming-conventions-for-visual-basic-n.html

Other link for naming conventions :
http://www.ssw.com.au/ssw/Standards/DeveloperdotNET/DotNetStandard_ObjectNaming.aspx

Mod Operator

Divides two numbers and returns only the remainder.

Dim testResult As Double
testResult = 10 Mod 5
testResult = 10 Mod 3
testResult = 12 Mod 4.3
testResult = 12.6 Mod 5
testResult = 47.9 Mod 9.35

The expressions in the previous example return values of 0, 1, 3.4, 2.6, and 1.15.

If you familiar with foxpro, this operator same with %.

Math.Round Method

Rounds a value to the nearest integer or to the specified number of fractional digits.

This member is overloaded. For complete information about this member, including syntax, usage, and examples, click a name in the overload list.

Overload List

Name	Description
Round(Decimal)	Rounds a decimal value to the nearest integral value.
Round(Double)	Rounds a double-precision floating-point value to the nearest integral value.
Round(Decimal, Int32)	Rounds a decimal value to a specified number of fractional digits.
Round(Decimal, MidpointRounding)	Rounds a decimal value to the nearest integer. A parameter specifies how to round the value if it is midway between two numbers.
Round(Double, Int32)	Rounds a double-precision floating-point value to a specified number of fractional digits.
Round(Double, MidpointRounding)	Rounds a double-precision floating-point value to the nearest integer. A parameter specifies how to round the value if it is midway between two numbers.
Round(Decimal, Int32, MidpointRounding)	Rounds a decimal value to a specified number of fractional digits. A parameter specifies how to round the value if it is midway between two numbers.
Round(Double, Int32, MidpointRounding)	Rounds a double-precision floating-point value to a specified number of fractional digits. A parameter specifies how to round the value if it is midway between two numbers.

Source : http://msdn.microsoft.com/en-us/library/system.math.round.aspx

Innodb_force_recovery

If you get this message, you can added innodb_force_recovery = 6 to my.conf.
#The mySQL sever 
[mysqld]
...
...
innodb_log_file_size = 5M
innodb_log_buffer_size = 8M
innodb_flush_log_at_trx_commit = 1
innodb_lock_wait_timeout = 50
innodb_force_recovery = 6

If you use xamp, this file at directory xamp\mysql\bin.

2013-10-14 05:37:43 2508 [Note] Plugin 'FEDERATED' is disabled.
2013-10-14 05:37:43 9d0 InnoDB: Warning: Using innodb_additional_mem_pool_size is DEPRECATED. This option may be removed in future releases, together with the option innodb_use_sys_malloc and with the InnoDB's internal memory allocator.
2013-10-14 05:37:43 2508 [Note] InnoDB: The InnoDB memory heap is disabled
2013-10-14 05:37:43 2508 [Note] InnoDB: Mutexes and rw_locks use Windows interlocked functions
2013-10-14 05:37:43 2508 [Note] InnoDB: Compressed tables use zlib 1.2.3
2013-10-14 05:37:43 2508 [Note] InnoDB: Not using CPU crc32 instructions
2013-10-14 05:37:43 2508 [Note] InnoDB: Initializing buffer pool, size = 16.0M
2013-10-14 05:37:43 2508 [Note] InnoDB: Completed initialization of buffer pool
2013-10-14 05:37:43 2508 [Note] InnoDB: Highest supported file format is Barracuda.
2013-10-14 05:37:43 2508 [Note] InnoDB: The log sequence numbers 0 and 0 in ibdata files do not match the log sequence number 1605539 in the ib_logfiles!
2013-10-14 05:37:43 2508 [Note] InnoDB: Database was not shutdown normally!
2013-10-14 05:37:43 2508 [Note] InnoDB: Starting crash recovery.
2013-10-14 05:37:43 2508 [Note] InnoDB: Reading tablespace information from the .ibd files...
2013-10-14 05:37:43 2508 [ERROR] InnoDB: Attempted to open a previously opened tablespace. Previous tablespace mysql/slave_relay_log_info uses space ID: 3 at filepath: .\mysql\slave_relay_log_info.ibd. Cannot open tablespace namedatabase\nametable which uses space ID: 3 at filepath: .\namedatabase\nametable.ibd
InnoDB: Error: could not open single-table tablespace file .\namedatabase\nametable.ibd
InnoDB: We do not continue the crash recovery, because the table may become
InnoDB: corrupt if we cannot apply the log records in the InnoDB log to it.
InnoDB: To fix the problem and start mysqld:
InnoDB: 1) If there is a permission problem in the file and mysqld cannot
InnoDB: open the file, you should modify the permissions.
InnoDB: 2) If the table is not needed, or you can restore it from a backup,
InnoDB: then you can remove the .ibd file, and InnoDB will do a normal
InnoDB: crash recovery and ignore that table.
InnoDB: 3) If the file system or the disk is broken, and you cannot remove
InnoDB: the .ibd file, you can set innodb_force_recovery > 0 in my.cnf
InnoDB: and force InnoDB to continue crash recovery here.

innodb_force_recovery is 0 by default (normal startup without forced recovery) The permissible nonzero values for innodb_force_recovery follow. A larger number includes all precautions of smaller numbers. If you are able to dump your tables with an option value of at most 4, then you are relatively safe that only some data on corrupt individual pages is lost. A value of 6 is more drastic because database pages are left in an obsolete state, which in turn may introduce more corruption into B-trees and other database structures.

• 1 (SRV_FORCE_IGNORE_CORRUPT)
  Let the server run even if it detects a corrupt page. Try to make SELECT * FROM tbl_name jump over corrupt index records and pages, which helps in dumping tables.
• 2 (SRV_FORCE_NO_BACKGROUND)
  Prevent the main thread from running. If a crash would occur during the purge operation, this recovery value prevents it.
• 3 (SRV_FORCE_NO_TRX_UNDO)
  Do not run transaction rollbacks after recovery.
• 4 (SRV_FORCE_NO_IBUF_MERGE)
  Prevent insert buffer merge operations. If they would cause a crash, do not do them. Do not calculate table statistics.
• 5 (SRV_FORCE_NO_UNDO_LOG_SCAN)
  Do not look at undo logs when starting the database: InnoDB treats even incomplete transactions as committed.
• 6 (SRV_FORCE_NO_LOG_REDO)
  Do not do the log roll-forward in connection with recovery.
  Information further can look at http://dev.mysql.com/doc/refman/5.0/en/forcing-innodb-recovery.html

Tablespace exist

If you look message ...

You delete ...\mysql\data\namedatabase\nametable.

Login

If you will create Login, you can use this script :

Imports MySql.Data.MySqlClient
Private Sub cmbOK_Click(sender As Object, e As EventArgs) Handles cmbOK.Click
        Dim conn As MySqlConnection

        'Connect to the database using these credentials
        conn = New MySqlConnection
        conn.ConnectionString = "Data Source=127.0.0.1;Database= namedatabase;User ID=name user;Password= password;"

        'Try and connect (conn.open)
        Try
            conn.Open()

        Catch myerror As MySqlException 'If it fails do this... (i.e. no internet or intranet connection, etc.)
            MsgBox("Error connecting to database. Check your internet / intranet connection.", MsgBoxStyle.Critical)
        End Try


        'MySQL query (where to call for information)
        Dim myAdapter As New MySqlDataAdapter

        'Tell where to find the file with the emails/passes stored
        Dim sqlquery = "SELECT * FROM userid WHERE UserID = '" & txtUserID.Text & "' AND Password = '" & txtPassword.Text & "'"
        Dim myCommand As New MySqlCommand
        myCommand.Connection = conn
        myCommand.CommandText = sqlquery

        'Start query
        myAdapter.SelectCommand = myCommand
        Dim myData As MySqlDataReader
        myData = myCommand.ExecuteReader

        'See if the user exists
        If myData.HasRows = 0 Then
            MsgBox("Invalid user id or password.", MsgBoxStyle.Critical)

            'Insert your settings change here. (i.e. My.Settings.LoggedIn = False)

        Else
            MsgBox("Logged in as " & txtUserID.Text & ".", MsgBoxStyle.Information)
            'MDIParent1.gcUserID = txtUserID.Text
            MDIParent1.ToolStripStatusLabel.Text = "Logged in as : " & txtUserID.Text
            'Another settings change: My.Settings.LoggedIn = True

            Me.Close() 'close the login form    End Sub
        End If

End Sub

Hello World

This step by step for simple example make "Hello Word".

1. Click New Project to start project.

 
2. Choose "Console Application" for starts this project.

 3. And then write this script ;

4. Click Start for running this script.

Visual Studio Languages

Find the resources for learning and for using the Visual Studio languages, to build the applications you need.ramming models.

Visual C++
Get the resources to learn and use the powerful and flexible Visual C++ language, with the tools to enable the development of native Windows apps, native desktop apps, and managed apps that run on the .NET Framework.

Visual C#
Get an introduction to C#, an elegant and type-safe object-oriented language that enables developers to build a variety of secure and robust applications that run on the .NET Framework. Find the resources for learning Visual C#, and for building application.

Visual Basic
Discover a wealth of resources for learning and using Visual Basic, a language engineered for productively building type-safe and object-oriented applications, for both the beginner and the experienced developer.

JavaScript
Learn about how to use Microsoft's implementation of JavaScript, which is compliant with the ECMAScript Language Specification 5th Edition, for creating Windows Store and Windows Phone apps, and on the web.

Visual F#
Build your Visual F# development skills and learn about the F# language, a multi-paradigm programming language targeting the .NET platform. The F# language supports functional, object-oriented, and imperative programming models.

Simple call form from MDIParent

If you want call form from MDIParent, this script is manner for this case :

Form menu in MDIParent, click this menu, then it's show procedure click as like below.

Private Sub StockToolStripMenuItem_Click(sender As Object, e As EventArgs) Handles StockToolStripMenuItem.Click
        frmStock.MdiParent = Me
        frmStock.Show()
End Sub