DataGridView　DefaultCellStyleでの書式指定について。

<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Class Form1
    Inherits System.Windows.Forms.Form

    'フォームがコンポーネントの一覧をクリーンアップするために dispose をオーバーライドします。
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Windows フォーム デザイナで必要です。
    Private components As System.ComponentModel.IContainer

    'メモ: 以下のプロシージャは Windows フォーム デザイナで必要です。
    'Windows フォーム デザイナを使用して変更できます。  
    'コード エディタを使って変更しないでください。
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Dim DataGridViewCellStyle1 As System.Windows.Forms.DataGridViewCellStyle = New System.Windows.Forms.DataGridViewCellStyle
        Me.DataGridView1 = New System.Windows.Forms.DataGridView
        Me.Column1 = New System.Windows.Forms.DataGridViewTextBoxColumn
        Me.Column2 = New System.Windows.Forms.DataGridViewTextBoxColumn
        CType(Me.DataGridView1, System.ComponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        '
        'DataGridView1
        '
        Me.DataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize
        Me.DataGridView1.Columns.AddRange(New System.Windows.Forms.DataGridViewColumn() {Me.Column1, Me.Column2})
        Me.DataGridView1.Location = New System.Drawing.Point(12, 72)
        Me.DataGridView1.Name = "DataGridView1"
        Me.DataGridView1.RowTemplate.Height = 21
        Me.DataGridView1.Size = New System.Drawing.Size(268, 68)
        Me.DataGridView1.TabIndex = 0
        '
        'Column1
        '
        Me.Column1.HeaderText = "Column1"
        Me.Column1.Name = "Column1"
        '
        'Column2
        '
        DataGridViewCellStyle1.Format = "N1"
        DataGridViewCellStyle1.NullValue = Nothing
        Me.Column2.DefaultCellStyle = DataGridViewCellStyle1
        Me.Column2.HeaderText = "Column2"
        Me.Column2.Name = "Column2"
        '
        'Form1
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 12.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Controls.Add(Me.DataGridView1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        CType(Me.DataGridView1, System.ComponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)

    End Sub
    Friend WithEvents DataGridView1 As System.Windows.Forms.DataGridView
    Friend WithEvents Column1 As System.Windows.Forms.DataGridViewTextBoxColumn
    Friend WithEvents Column2 As System.Windows.Forms.DataGridViewTextBoxColumn

End Class