VB ADO Example

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Imports System.Data
Imports Microsoft.VisualBasic

Imports CenterSpace.NMath.Core
Imports System.IO

Namespace CenterSpace.NMath.Core.Examples.VisualBasic

  ' A .NET example in Visual Basic showing ADO.NET and NMath Stats objects.
  Public Class Form1
    Inherits System.Windows.Forms.Form

    Private Frame As DataFrame

#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

      ' Data consists of high jump, discus throw, long jump marks set
      ' during Olympic years from 1896 - 1984.
      Frame = DataFrame.Load("ADOExample.dat", True, False, ControlChars.Tab, True)

      ' Adjust year to 4 digits.  Eg. -4 => 1896.
      Dim YearColumn As Integer = Frame.IndexOfColumn("Olympic_Year")
      Dim I As Integer

      For I = 0 To Frame.Rows - 1
        Dim Original As Double = CType(Frame(I, YearColumn), Double)
        Frame(I, YearColumn) = Original + 1900
      Next

      ' Permute columns so year comes first.
      Frame.PermuteColumns(1, 0)

      ' Convert my DataFrame to a DataTable.
      Dim Table As DataTable = Frame.ToDataTable()

      ' Remove the index column.
      Table.Columns.Remove(Frame.RowKeyHeader)

      ' Bind to DataGrid.
      DataGrid1.DataSource = Table

      Recompute()

    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 DataGrid1 As System.Windows.Forms.DataGrid
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents Label4 As System.Windows.Forms.Label
    Friend WithEvents Label5 As System.Windows.Forms.Label
    Friend WithEvents Record As System.Windows.Forms.TextBox
    Friend WithEvents Average As System.Windows.Forms.TextBox
    Friend WithEvents Shortest As System.Windows.Forms.TextBox
    Friend WithEvents Variance As System.Windows.Forms.TextBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
      Me.DataGrid1 = New System.Windows.Forms.DataGrid()
      Me.Label1 = New System.Windows.Forms.Label()
      Me.Label2 = New System.Windows.Forms.Label()
      Me.Button1 = New System.Windows.Forms.Button()
      Me.Label3 = New System.Windows.Forms.Label()
      Me.Label4 = New System.Windows.Forms.Label()
      Me.Label5 = New System.Windows.Forms.Label()
      Me.Record = New System.Windows.Forms.TextBox()
      Me.Average = New System.Windows.Forms.TextBox()
      Me.Shortest = New System.Windows.Forms.TextBox()
      Me.Variance = New System.Windows.Forms.TextBox()
      CType(Me.DataGrid1, System.ComponentModel.ISupportInitialize).BeginInit()
      Me.SuspendLayout()
      '
      'DataGrid1
      '
      Me.DataGrid1.BackgroundColor = System.Drawing.Color.White
      Me.DataGrid1.CaptionVisible = False
      Me.DataGrid1.DataMember = ""
      Me.DataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText
      Me.DataGrid1.Location = New System.Drawing.Point(16, 80)
      Me.DataGrid1.Name = "DataGrid1"
      Me.DataGrid1.Size = New System.Drawing.Size(208, 312)
      Me.DataGrid1.TabIndex = 0
      '
      'Label1
      '
      Me.Label1.Font = New System.Drawing.Font("Microsoft Sans Serif", 15.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
      Me.Label1.Location = New System.Drawing.Point(128, 24)
      Me.Label1.Name = "Label1"
      Me.Label1.Size = New System.Drawing.Size(192, 40)
      Me.Label1.TabIndex = 1
      Me.Label1.Text = "ADO Example"
      '
      'Label2
      '
      Me.Label2.Location = New System.Drawing.Point(248, 88)
      Me.Label2.Name = "Label2"
      Me.Label2.Size = New System.Drawing.Size(72, 23)
      Me.Label2.TabIndex = 2
      Me.Label2.Text = "Record"
      '
      'Button1
      '
      Me.Button1.Location = New System.Drawing.Point(264, 296)
      Me.Button1.Name = "Button1"
      Me.Button1.Size = New System.Drawing.Size(152, 24)
      Me.Button1.TabIndex = 3
      Me.Button1.Text = "Recompute"
      '
      'Label3
      '
      Me.Label3.Location = New System.Drawing.Point(248, 136)
      Me.Label3.Name = "Label3"
      Me.Label3.TabIndex = 4
      Me.Label3.Text = "Average"
      '
      'Label4
      '
      Me.Label4.Location = New System.Drawing.Point(248, 184)
      Me.Label4.Name = "Label4"
      Me.Label4.TabIndex = 5
      Me.Label4.Text = "Shortest"
      '
      'Label5
      '
      Me.Label5.Location = New System.Drawing.Point(248, 232)
      Me.Label5.Name = "Label5"
      Me.Label5.TabIndex = 6
      Me.Label5.Text = "Variance"
      '
      'Record
      '
      Me.Record.Location = New System.Drawing.Point(336, 88)
      Me.Record.Name = "Record"
      Me.Record.TabIndex = 7
      Me.Record.Text = ""
      '
      'Average
      '
      Me.Average.Location = New System.Drawing.Point(336, 136)
      Me.Average.Name = "Average"
      Me.Average.TabIndex = 8
      Me.Average.Text = ""
      '
      'Shortest
      '
      Me.Shortest.Location = New System.Drawing.Point(336, 184)
      Me.Shortest.Name = "Shortest"
      Me.Shortest.TabIndex = 9
      Me.Shortest.Text = ""
      '
      'Variance
      '
      Me.Variance.Location = New System.Drawing.Point(336, 232)
      Me.Variance.Name = "Variance"
      Me.Variance.TabIndex = 10
      Me.Variance.Text = ""
      '
      'Form1
      '
      Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
      Me.ClientSize = New System.Drawing.Size(466, 424)
      Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Variance, Me.Shortest, Me.Average, Me.Record, Me.Label5, Me.Label4, Me.Label3, Me.Button1, Me.Label2, Me.Label1, Me.DataGrid1})
      Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
      Me.Name = "Form1"
      Me.Text = "ADO Example"
      CType(Me.DataGrid1, System.ComponentModel.ISupportInitialize).EndInit()
      Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
      Recompute()
    End Sub

    Private Sub Recompute()
      Frame = New DataFrame(CType(DataGrid1.DataSource, DataTable))
      Average.Text = StatsFunctions.Mean(Frame("Long_Jump")).ToString()
      Record.Text = StatsFunctions.MaxValue(Frame("Long_Jump")).ToString()
      Shortest.Text = StatsFunctions.MinValue(Frame("Long_Jump")).ToString()
      Variance.Text = StatsFunctions.Variance(Frame("Long_Jump")).ToString()
    End Sub

  End Class

End Namespace


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