' Groceries3 Example

' Create database objects from code and display data in
' textboxes directly from the dataset (no data bindings).

Imports System.Data.OleDb
Public Class Form1
    Inherits System.Windows.Forms.Form

    Private c As OleDbConnection
    Private sc As OleDbCommand
    Private da As OleDbDataAdapter
    Private ds As DataSet
    Private nRows As Integer
    Private currentRow As Integer

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents Label4 As System.Windows.Forms.Label
    Friend WithEvents txtItemName As System.Windows.Forms.TextBox
    Friend WithEvents txtCode As System.Windows.Forms.TextBox
    Friend WithEvents txtPrice As System.Windows.Forms.TextBox
    Friend WithEvents txtQuantity As System.Windows.Forms.TextBox
    Friend WithEvents btnFirst As System.Windows.Forms.Button
    Friend WithEvents btnPrevious As System.Windows.Forms.Button
    Friend WithEvents btnNext As System.Windows.Forms.Button
    Friend WithEvents btnLast As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.txtItemName = New System.Windows.Forms.TextBox
        Me.txtCode = New System.Windows.Forms.TextBox
        Me.Label1 = New System.Windows.Forms.Label
        Me.Label2 = New System.Windows.Forms.Label
        Me.txtPrice = New System.Windows.Forms.TextBox
        Me.Label3 = New System.Windows.Forms.Label
        Me.txtQuantity = New System.Windows.Forms.TextBox
        Me.Label4 = New System.Windows.Forms.Label
        Me.btnFirst = New System.Windows.Forms.Button
        Me.btnPrevious = New System.Windows.Forms.Button
        Me.btnNext = New System.Windows.Forms.Button
        Me.btnLast = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'txtItemName
        '
        Me.txtItemName.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.txtItemName.Location = New System.Drawing.Point(112, 56)
        Me.txtItemName.Name = "txtItemName"
        Me.txtItemName.ReadOnly = True
        Me.txtItemName.Size = New System.Drawing.Size(240, 26)
        Me.txtItemName.TabIndex = 0
        Me.txtItemName.Text = ""
        '
        'txtCode
        '
        Me.txtCode.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.txtCode.Location = New System.Drawing.Point(112, 96)
        Me.txtCode.Name = "txtCode"
        Me.txtCode.ReadOnly = True
        Me.txtCode.Size = New System.Drawing.Size(240, 26)
        Me.txtCode.TabIndex = 2
        Me.txtCode.Text = ""
        '
        'Label1
        '
        Me.Label1.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label1.Location = New System.Drawing.Point(24, 56)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(88, 24)
        Me.Label1.TabIndex = 1
        Me.Label1.Text = "ItemName"
        '
        'Label2
        '
        Me.Label2.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label2.Location = New System.Drawing.Point(64, 96)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(48, 24)
        Me.Label2.TabIndex = 3
        Me.Label2.Text = "Code"
        '
        'txtPrice
        '
        Me.txtPrice.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.txtPrice.Location = New System.Drawing.Point(112, 136)
        Me.txtPrice.Name = "txtPrice"
        Me.txtPrice.ReadOnly = True
        Me.txtPrice.Size = New System.Drawing.Size(240, 26)
        Me.txtPrice.TabIndex = 4
        Me.txtPrice.Text = ""
        '
        'Label3
        '
        Me.Label3.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label3.Location = New System.Drawing.Point(64, 136)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(48, 24)
        Me.Label3.TabIndex = 5
        Me.Label3.Text = "Price"
        '
        'txtQuantity
        '
        Me.txtQuantity.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.txtQuantity.Location = New System.Drawing.Point(112, 176)
        Me.txtQuantity.Name = "txtQuantity"
        Me.txtQuantity.ReadOnly = True
        Me.txtQuantity.Size = New System.Drawing.Size(240, 26)
        Me.txtQuantity.TabIndex = 6
        Me.txtQuantity.Text = ""
        '
        'Label4
        '
        Me.Label4.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label4.Location = New System.Drawing.Point(40, 176)
        Me.Label4.Name = "Label4"
        Me.Label4.Size = New System.Drawing.Size(72, 24)
        Me.Label4.TabIndex = 7
        Me.Label4.Text = "Quantity"
        '
        'btnFirst
        '
        Me.btnFirst.Location = New System.Drawing.Point(48, 16)
        Me.btnFirst.Name = "btnFirst"
        Me.btnFirst.Size = New System.Drawing.Size(64, 24)
        Me.btnFirst.TabIndex = 8
        Me.btnFirst.Text = "First"
        '
        'btnPrevious
        '
        Me.btnPrevious.Location = New System.Drawing.Point(128, 16)
        Me.btnPrevious.Name = "btnPrevious"
        Me.btnPrevious.Size = New System.Drawing.Size(64, 24)
        Me.btnPrevious.TabIndex = 9
        Me.btnPrevious.Text = "Previous"
        '
        'btnNext
        '
        Me.btnNext.Location = New System.Drawing.Point(208, 16)
        Me.btnNext.Name = "btnNext"
        Me.btnNext.Size = New System.Drawing.Size(64, 24)
        Me.btnNext.TabIndex = 10
        Me.btnNext.Text = "Next"
        '
        'btnLast
        '
        Me.btnLast.Location = New System.Drawing.Point(288, 16)
        Me.btnLast.Name = "btnLast"
        Me.btnLast.Size = New System.Drawing.Size(64, 24)
        Me.btnLast.TabIndex = 11
        Me.btnLast.Text = "Last"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(376, 225)
        Me.Controls.Add(Me.btnLast)
        Me.Controls.Add(Me.btnNext)
        Me.Controls.Add(Me.btnPrevious)
        Me.Controls.Add(Me.btnFirst)
        Me.Controls.Add(Me.Label4)
        Me.Controls.Add(Me.txtQuantity)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.txtPrice)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.txtCode)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.txtItemName)
        Me.Name = "Form1"
        Me.Text = "GroceriesBinding Example"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Form1_Load(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles MyBase.Load

        ' Create and configure connection object.
        c = New OleDbConnection
        c.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" & _
            "Data Source=c:\Database\Groceries.mdb"

        ' Create and configure command object.
        sc = c.CreateCommand()
        sc.CommandType = CommandType.Text
        sc.CommandText = "SELECT * FROM GroceryList"

        ' Create and configure data adapter object.
        da = New OleDbDataAdapter
        da.SelectCommand = sc

        ' Create and configure dataset object.
        ds = New DataSet
        nRows = da.Fill(ds, "GroceryList")

        ' Initialize current row in table and display data.
        currentRow = 0
        DisplayTextBoxValues()

        ' Unselect word in ItemName textbox.
        txtItemName.SelectionLength = 0
    End Sub

    Private Sub DisplayTextBoxValues()

        ' Display data of current row in textboxes.  
        ' Recall that column 0 is the primary key.
        txtItemName.Text = ds.Tables(0).Rows(currentRow).Item(1)
        txtCode.Text = ds.Tables(0).Rows(currentRow).Item(2)
        txtPrice.Text = ds.Tables(0).Rows(currentRow).Item(3)
        txtQuantity.Text = ds.Tables(0).Rows(currentRow).Item(4)
    End Sub


    Private Sub btnFirst_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles btnFirst.Click

        ' Move to first row and display data.
        currentRow = 0
        DisplayTextBoxValues()
    End Sub

    Private Sub btnPrevious_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles btnPrevious.Click

        ' Move to previous row and display data.
        If currentRow > 0 Then
            currentRow -= 1
        End If
        DisplayTextBoxValues()
    End Sub

    Private Sub btnNext_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles btnNext.Click

        ' Move to next row and display data.
        If currentRow < nRows - 1 Then
            currentRow += 1
        End If
        DisplayTextBoxValues()
    End Sub

    Private Sub btnLast_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles btnLast.Click

        ' Move to last row and display data.
        currentRow = nRows - 1
        DisplayTextBoxValues()
    End Sub
End Class