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DataGridViewImageColumn Class

Hosts a collection of DataGridViewImageCell objects.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

'Declaration
<ToolboxBitmapAttribute(GetType(DataGridViewImageColumn), "DataGridViewImageColumn.bmp")> _
Public Class DataGridViewImageColumn _
	Inherits DataGridViewColumn

The DataGridViewImageColumn type exposes the following members.

  NameDescription
Public methodDataGridViewImageColumnInitializes a new instance of the DataGridViewImageColumn class, configuring it for use with cell values of type Image.
Public methodDataGridViewImageColumn(Boolean)Initializes a new instance of the DataGridViewImageColumn class, optionally configuring it for use with Icon cell values.
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  NameDescription
Public propertyAutoSizeModeGets or sets the mode by which the column automatically adjusts its width. (Inherited from DataGridViewColumn.)
Public propertyCellTemplateGets or sets the template used to create new cells. (Overrides DataGridViewColumn.CellTemplate.)
Public propertyCellTypeGets the run-time type of the cell template. (Inherited from DataGridViewColumn.)
Public propertyContextMenuStripGets or sets the shortcut menu for the column. (Inherited from DataGridViewColumn.)
Public propertyDataGridViewGets the DataGridView control associated with this element. (Inherited from DataGridViewElement.)
Public propertyDataPropertyNameGets or sets the name of the data source property or database column to which the DataGridViewColumn is bound. (Inherited from DataGridViewColumn.)
Public propertyDefaultCellStyleGets or sets the column's default cell style. (Overrides DataGridViewColumn.DefaultCellStyle.)
Public propertyDefaultHeaderCellTypeGets or sets the run-time type of the default header cell. (Inherited from DataGridViewBand.)
Public propertyDescriptionGets or sets a string that describes the column's image.
Public propertyDisplayedGets a value indicating whether the band is currently displayed onscreen. (Inherited from DataGridViewBand.)
Public propertyDisplayIndexGets or sets the display order of the column relative to the currently displayed columns. (Inherited from DataGridViewColumn.)
Public propertyDividerWidthGets or sets the width, in pixels, of the column divider. (Inherited from DataGridViewColumn.)
Public propertyFillWeightGets or sets a value that represents the width of the column when it is in fill mode relative to the widths of other fill-mode columns in the control. (Inherited from DataGridViewColumn.)
Public propertyFrozenGets or sets a value indicating whether a column will move when a user scrolls the DataGridView control horizontally. (Inherited from DataGridViewColumn.)
Public propertyHasDefaultCellStyleGets a value indicating whether the DefaultCellStyle property has been set. (Inherited from DataGridViewBand.)
Public propertyHeaderCellGets or sets the DataGridViewColumnHeaderCell that represents the column header. (Inherited from DataGridViewColumn.)
Protected propertyHeaderCellCoreGets or sets the header cell of the DataGridViewBand. (Inherited from DataGridViewBand.)
Public propertyHeaderTextGets or sets the caption text on the column's header cell. (Inherited from DataGridViewColumn.)
Public propertyIconGets or sets the icon displayed in the cells of this column when the cell's Value property is not set and the cell's ValueIsIcon property is set to true.
Public propertyImageGets or sets the image displayed in the cells of this column when the cell's Value property is not set and the cell's ValueIsIcon property is set to false.
Public propertyImageLayoutGets or sets the image layout in the cells for this column.
Public propertyIndexGets the relative position of the band within the DataGridView control. (Inherited from DataGridViewBand.)
Public propertyInheritedAutoSizeModeGets the sizing mode in effect for the column. (Inherited from DataGridViewColumn.)
Public propertyInheritedStyleGets the cell style currently applied to the column. (Inherited from DataGridViewColumn.)
Public propertyIsDataBoundGets a value indicating whether the column is bound to a data source. (Inherited from DataGridViewColumn.)
Protected propertyIsRowGets a value indicating whether the band represents a row. (Inherited from DataGridViewBand.)
Public propertyMinimumWidthGets or sets the minimum width, in pixels, of the column. (Inherited from DataGridViewColumn.)
Public propertyNameGets or sets the name of the column. (Inherited from DataGridViewColumn.)
Public propertyReadOnlyGets or sets a value indicating whether the user can edit the column's cells. (Inherited from DataGridViewColumn.)
Public propertyResizableGets or sets a value indicating whether the column is resizable. (Inherited from DataGridViewColumn.)
Public propertySelectedGets or sets a value indicating whether the band is in a selected user interface (UI) state. (Inherited from DataGridViewBand.)
Public propertySiteInfrastructure. Gets or sets the site of the column. (Inherited from DataGridViewColumn.)
Public propertySortModeGets or sets the sort mode for the column. (Inherited from DataGridViewColumn.)
Public propertyStateGets the user interface (UI) state of the element. (Inherited from DataGridViewElement.)
Public propertyTagGets or sets the object that contains data to associate with the band. (Inherited from DataGridViewBand.)
Public propertyToolTipTextGets or sets the text used for ToolTips. (Inherited from DataGridViewColumn.)
Public propertyValuesAreIconsGets or sets a value indicating whether cells in this column display Icon values.
Public propertyValueTypeGets or sets the data type of the values in the column's cells. (Inherited from DataGridViewColumn.)
Public propertyVisibleGets or sets a value indicating whether the column is visible. (Inherited from DataGridViewColumn.)
Public propertyWidthGets or sets the current width of the column. (Inherited from DataGridViewColumn.)
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  NameDescription
Public methodCloneCreates an exact copy of this column. (Overrides DataGridViewColumn.Clone.)
Public methodDisposeReleases all resources used by the DataGridViewBand. (Inherited from DataGridViewBand.)
Protected methodDispose(Boolean)Releases the unmanaged resources used by the DataGridViewBand and optionally releases the managed resources. (Inherited from DataGridViewColumn.)
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeReleases the resources associated with the band. (Inherited from DataGridViewBand.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetPreferredWidthCalculates the ideal width of the column based on the specified criteria. (Inherited from DataGridViewColumn.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Protected methodOnDataGridViewChangedCalled when the band is associated with a different DataGridView. (Inherited from DataGridViewBand.)
Protected methodRaiseCellClickRaises the DataGridView.CellClick event. (Inherited from DataGridViewElement.)
Protected methodRaiseCellContentClickRaises the DataGridView.CellContentClick event. (Inherited from DataGridViewElement.)
Protected methodRaiseCellContentDoubleClickRaises the DataGridView.CellContentDoubleClick event. (Inherited from DataGridViewElement.)
Protected methodRaiseCellValueChangedRaises the DataGridView.CellValueChanged event. (Inherited from DataGridViewElement.)
Protected methodRaiseDataErrorRaises the DataGridView.DataError event. (Inherited from DataGridViewElement.)
Protected methodRaiseMouseWheelRaises the Control.MouseWheel event. (Inherited from DataGridViewElement.)
Public methodToStringGets a string that describes the column. (Overrides DataGridViewColumn.ToString.)
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  NameDescription
Public eventDisposedOccurs when the DataGridViewColumn is disposed. (Inherited from DataGridViewColumn.)
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The DataGridViewImageColumn class is a specialized type of the DataGridViewColumn class used to logically host cells that display images. A DataGridViewImageColumn has an associated DataGridViewImageCell in every DataGridViewRow that intersects it. Each cell is capable of containing an Image or an Icon, depending on the value of the DataGridViewImageCell.ValueIsIcon property. Displaying icons is useful to accommodate images with transparency.

By default, empty cells display a default error graphic. To prevent this graphic from appearing for cell values equal to Nothing or DBNull.Value, set the DataGridViewCellStyle.NullValue property of the cell style object returned by the DefaultCellStyle property to Nothing before adding rows to the control. This does not affect the row for new records, however. To prevent the error graphic from appearing in the row for new records when the control AllowUserToAddRows property value is true, you must also either explicitly set the cell value to Nothing in a handler for the control RowsAdded event or set the column CellTemplate property to an instance of a DataGridViewImageCell-derived type with an overridden DefaultNewRowValue property that returns Nothing.

The default sort mode for this column type is NotSortable.

Notes to Inheritors

When you derive from DataGridViewImageColumn and add new properties to the derived class, be sure to override the Clone method to copy the new properties during cloning operations. You should also call the base class's Clone method so that the properties of the base class are copied to the new cell.

The following code example demonstrates how to use images to create a TicTacToe game.


Imports System.IO
Imports System.Windows.Forms
Imports System.Drawing
Imports System

Public Class TicTacToe
    Inherits System.Windows.Forms.Form

    Friend WithEvents dataGridView1 As DataGridView
    Friend WithEvents Button1 As Button = New Button()
    Friend WithEvents turn As Label = New Label()
    Friend WithEvents Button2 As Button = New Button()
    Friend WithEvents Button3 As Button = New Button()
    Friend WithEvents Button4 As Button = New Button()
    Friend WithEvents Button5 As Button = New Button()
    Friend WithEvents Panel1 As FlowLayoutPanel = New FlowLayoutPanel()

#Region "bitmaps"
    Private oImage As Byte() = { _
        &H42, &H4D, &HC6, &H0, &H0, &H0, &H0, &H0, _
        &H0, &H0, &H76, &H0, &H0, &H0, &H28, &H0, _
        &H0, &H0, &HB, &H0, &H0, &H0, &HA, &H0, _
        &H0, &H0, &H1, &H0, &H4, &H0, &H0, &H0, _
        &H0, &H0, &H50, &H0, &H0, &H0, &H0, &H0, _
        &H0, &H0, &H0, &H0, &H0, &H0, &H10, &H0, _
        &H0, &H0, &H10, &H0, &H0, &H0, &H0, &H0, _
        &H0, &H0, &H0, &H0, &H80, &H0, &H0, &H80, _
        &H0, &H0, &H0, &H80, &H80, &H0, &H80, &H0, _
        &H0, &H0, &H80, &H0, &H80, &H0, &H80, &H80, _
        &H0, &H0, &HC0, &HC0, &HC0, &H0, &H80, &H80, _
        &H80, &H0, &H0, &H0, &HFF, &H0, &H0, &HFF, _
        &H0, &H0, &H0, &HFF, &HFF, &H0, &HFF, &H0, _
        &H0, &H0, &HFF, &H0, &HFF, &H0, &HFF, &HFF, _
        &H0, &H0, &HFF, &HFF, &HFF, &H0, &HFF, &HFF, _
        &H0, &HF, &HFF, &HF0, &H0, &H0, &HFF, &H0, _
        &HFF, &HF0, &HF, &HF0, &H0, &H0, &HF0, &HFF, _
        &HFF, &HFF, &HF0, &HF0, &H0, &H0, &HF0, &HFF, _
        &HFF, &HFF, &HF0, &HF0, &H0, &H0, &HF, &HFF, _
        &HFF, &HFF, &HFF, &H0, &H0, &H0, &HF, &HFF, _
        &HFF, &HFF, &HFF, &H0, &H0, &H0, &HF0, &HFF, _
        &HFF, &HFF, &HF0, &HF0, &H0, &H0, &HF0, &HFF, _
        &HFF, &HFF, &HF0, &HF0, &H0, &H0, &HFF, &H0, _
        &HFF, &HF0, &HF, &HF0, &H0, &H0, &HFF, &HFF, _
        &H0, &HF, &HFF, &HF0, &H0, &H0}

    Private xImage As Byte() = { _
        &H42, &H4D, &HC6, &H0, &H0, &H0, &H0, &H0, _
        &H0, &H0, &H76, &H0, &H0, &H0, &H28, &H0, _
        &H0, &H0, &HB, &H0, &H0, &H0, &HA, &H0, _
        &H0, &H0, &H1, &H0, &H4, &H0, &H0, &H0, _
        &H0, &H0, &H50, &H0, &H0, &H0, &H0, &H0, _
        &H0, &H0, &H0, &H0, &H0, &H0, &H10, &H0, _
        &H0, &H0, &H10, &H0, &H0, &H0, &H0, &H0, _
        &H0, &H0, &H0, &H0, &H80, &H0, &H0, &H80, _
        &H0, &H0, &H0, &H80, &H80, &H0, &H80, &H0, _
        &H0, &H0, &H80, &H0, &H80, &H0, &H80, &H80, _
        &H0, &H0, &HC0, &HC0, &HC0, &H0, &H80, &H80, _
        &H80, &H0, &H0, &H0, &HFF, &H0, &H0, &HFF, _
        &H0, &H0, &H0, &HFF, &HFF, &H0, &HFF, &H0, _
        &H0, &H0, &HFF, &H0, &HFF, &H0, &HFF, &HFF, _
        &H0, &H0, &HFF, &HFF, &HFF, &H0, &HF0, &HFF, _
        &HFF, &HFF, &HF0, &HF0, &H0, &H0, &HFF, &HF, _
        &HFF, &HFF, &HF, &HF0, &H0, &H0, &HFF, &HF0, _
        &HFF, &HF0, &HFF, &HF0, &H0, &H0, &HFF, &HFF, _
        &HF, &HF, &HFF, &HF0, &H0, &H0, &HFF, &HFF, _
        &HF, &HF, &HFF, &HF0, &H0, &H0, &HFF, &HFF, _
        &HF, &HF, &HFF, &HF0, &H0, &H0, &HFF, &HF0, _
        &HFF, &HF0, &HFF, &HF0, &H0, &H0, &HFF, &HF, _
        &HFF, &HFF, &HF, &HF0, &H0, &H0, &HF0, &HFF, _
        &HFF, &HFF, &HF0, &HF0, &H0, &H0, &HFF, &HFF, _
        &HFF, &HFF, &HFF, &HF0, &H0, &H0}

    Private blankImage As Byte() = { _
        &H42, &H4D, &HC6, &H0, &H0, &H0, &H0, &H0, _
        &H0, &H0, &H76, &H0, &H0, &H0, &H28, &H0, _
        &H0, &H0, &HB, &H0, &H0, &H0, &HA, &H0, _
        &H0, &H0, &H1, &H0, &H4, &H0, &H0, &H0, _
        &H0, &H0, &H50, &H0, &H0, &H0, &H0, &H0, _
        &H0, &H0, &H0, &H0, &H0, &H0, &H10, &H0, _
        &H0, &H0, &H10, &H0, &H0, &H0, &H0, &H0, _
        &H0, &H0, &H0, &H0, &H80, &H0, &H0, &H80, _
        &H0, &H0, &H0, &H80, &H80, &H0, &H80, &H0, _
        &H0, &H0, &H80, &H0, &H80, &H0, &H80, &H80, _
        &H0, &H0, &HC0, &HC0, &HC0, &H0, &H80, &H80, _
        &H80, &H0, &H0, &H0, &HFF, &H0, &H0, &HFF, _
        &H0, &H0, &H0, &HFF, &HFF, &H0, &HFF, &H0, _
        &H0, &H0, &HFF, &H0, &HFF, &H0, &HFF, &HFF, _
        &H0, &H0, &HFF, &HFF, &HFF, &H0, &HFF, &HFF, _
        &HFF, &HFF, &HFF, &HF0, &H0, &H0, &HFF, &HFF, _
        &HFF, &HFF, &HFF, &HF0, &H0, &H0, &HFF, &HFF, _
        &HFF, &HFF, &HFF, &HF0, &H0, &H0, &HFF, &HFF, _
        &HFF, &HFF, &HFF, &HF0, &H0, &H0, &HFF, &HFF, _
        &HFF, &HFF, &HFF, &HF0, &H0, &H0, &HFF, &HFF, _
        &HFF, &HFF, &HFF, &HF0, &H0, &H0, &HFF, &HFF, _
        &HFF, &HFF, &HFF, &HF0, &H0, &H0, &HFF, &HFF, _
        &HFF, &HFF, &HFF, &HF0, &H0, &H0, &HFF, &HFF, _
        &HFF, &HFF, &HFF, &HF0, &H0, &H0, &HFF, &HFF, _
        &HFF, &HFF, &HFF, &HF0, &H0, &H0}
#End Region

    Private blank As Bitmap = New Bitmap( _
        New MemoryStream(blankImage))
    Private x As Bitmap = New Bitmap(New MemoryStream(xImage))
    Private o As Bitmap = New Bitmap(New MemoryStream(oImage))
    Private xString As String = "X's turn"
    Private oString As String = "O's turn"
    Private gameOverString As String = "Game Over"
    Private bitmapPadding As Integer = 6

    Private Sub InitializeDataGridView(ByVal sender As Object, _
        ByVal e As EventArgs) Handles Me.Load
        SuspendLayout()
        Panel1.SuspendLayout()

        ConfigureForm()
        SizeGrid()
        CreateColumns()
        CreateRows()

        ResumeLayout(False)
        Panel1.ResumeLayout(False)
    End Sub

    Private Sub ConfigureForm()
        AutoSize = True
        turn.Size = New System.Drawing.Size(75, 34)
        turn.TextAlign = ContentAlignment.MiddleLeft
        turn.Text = xString

        Panel1.FlowDirection = FlowDirection.TopDown
        Panel1.Location = New System.Drawing.Point(0, 8)
        Panel1.Size = New System.Drawing.Size(120, 196)

        ClientSize = New System.Drawing.Size(355, 200)
        Controls.Add(Me.Panel1)
        Text = "TicTacToe"

        dataGridView1 = New System.Windows.Forms.DataGridView
        dataGridView1.Location = New Point(120, 0)
        dataGridView1.AllowUserToAddRows = False
        Controls.Add(dataGridView1)
        SetupButtons()
    End Sub

    Private Sub SetupButtons()
        SetupButton(Button1, "Restart")
        Panel1.Controls.Add(Me.turn)
        SetupButton(Button2, "Increase Cell Size")
        SetupButton(Button3, "Stretch Images")
        SetupButton(Button4, "Zoom Images")
        SetupButton(Button5, "Normal Images")
    End Sub

    Private Sub SetupButton(ByVal button As Button, _
        ByVal buttonLabel As String)

        Panel1.Controls.Add(button)
        button.Text = buttonLabel
        button.AutoSize = True

    End Sub

    Private Sub CreateColumns()

        Dim imageColumn As DataGridViewImageColumn
        Dim columnCount As Integer = 0
        Do
            Dim unMarked As Bitmap = blank
            imageColumn = New DataGridViewImageColumn()

            ' Add twice the padding for the left and 
            ' right sides of the cell.
            imageColumn.Width = x.Width + 2 * bitmapPadding + 1

            imageColumn.Image = unMarked
            imageColumn.ImageLayout = DataGridViewImageCellLayout.NotSet
            imageColumn.Description = "default image layout"
            dataGridView1.Columns.Add(imageColumn)
            columnCount = columnCount + 1
        Loop While columnCount < 3
    End Sub

    Private Sub CreateRows()
        dataGridView1.Rows.Add()
        dataGridView1.Rows.Add()
        dataGridView1.Rows.Add()
    End Sub

    Private Sub SizeGrid()
        dataGridView1.ColumnHeadersVisible = False
        dataGridView1.RowHeadersVisible = False
        dataGridView1.AllowUserToResizeColumns = False
        dataGridView1.AllowUserToResizeRows = False
        dataGridView1.BorderStyle = BorderStyle.None

        ' Add twice the padding for the top and bottom of the cell. 
        dataGridView1.RowTemplate.Height = x.Height + _
            2 * bitmapPadding + 1

        dataGridView1.AutoSize = True
    End Sub

    Private Sub reset(ByVal sender As Object, _
        ByVal e As EventArgs) _
        Handles Button1.Click

        dataGridView1.Dispose()
        InitializeDataGridView(Nothing, Nothing)
    End Sub

    Private Sub dataGridView1_CellClick(ByVal sender As Object, _
        ByVal e As DataGridViewCellEventArgs) _
        Handles dataGridView1.CellClick

        If turn.Text.Equals(gameOverString) Then Return

        Dim cell As DataGridViewImageCell = _
            CType(dataGridView1.Rows(e.RowIndex). _
                Cells(e.ColumnIndex), DataGridViewImageCell)
        If (cell.Value Is blank) Then
            If IsOsTurn() Then
                cell.Value = o
            Else
                cell.Value = x
            End If
            ToggleTurn()
            ToolTip(e)
        End If
        If IsAWin() Then
            turn.Text = gameOverString
        End If
    End Sub

    Private Sub dataGridView1_CellMouseEnter(ByVal sender As Object, _
        ByVal e As DataGridViewCellEventArgs) _
        Handles dataGridView1.CellMouseEnter

        Dim markingUnderMouse As Bitmap = _
            CType(dataGridView1.Rows(e.RowIndex). _
                Cells(e.ColumnIndex).Value, Bitmap)

        If markingUnderMouse Is blank Then
            dataGridView1.Cursor = Cursors.Default
        ElseIf markingUnderMouse Is o OrElse markingUnderMouse Is x Then
            dataGridView1.Cursor = Cursors.No
            ToolTip(e)
        End If
    End Sub

    Private Sub ToolTip( _
        ByVal e As DataGridViewCellEventArgs)

        Dim cell As DataGridViewImageCell = _
            CType(dataGridView1.Rows(e.RowIndex). _
            Cells(e.ColumnIndex), DataGridViewImageCell)
        Dim imageColumn As DataGridViewImageColumn = _
            CType(dataGridView1.Columns(cell.ColumnIndex), _
            DataGridViewImageColumn)

        cell.ToolTipText = imageColumn.Description
    End Sub

    Private Sub dataGridView1_CellMouseLeave(ByVal sender As Object, _
        ByVal e As DataGridViewCellEventArgs) _
        Handles dataGridView1.CellMouseLeave

        dataGridView1.Cursor = Cursors.Default
    End Sub

    Private Sub Stretch(ByVal sender As Object, _
        ByVal e As EventArgs) Handles Button3.Click

        For Each column As DataGridViewImageColumn _
            In dataGridView1.Columns
            column.ImageLayout = DataGridViewImageCellLayout.Stretch
            column.Description = "Stretched image layout"
        Next
    End Sub

    Private Sub ZoomToImage(ByVal sender As Object, _
        ByVal e As EventArgs) Handles Button4.Click

        For Each column As DataGridViewImageColumn _
            In dataGridView1.Columns
            column.ImageLayout = DataGridViewImageCellLayout.Zoom
            column.Description = "Zoomed image layout"
        Next
    End Sub

    Private Sub NormalImage(ByVal sender As Object, _
        ByVal e As EventArgs) Handles Button5.Click

        For Each column As DataGridViewImageColumn _
            In dataGridView1.Columns
            column.ImageLayout = DataGridViewImageCellLayout.Normal
            column.Description = "Normal image layout"
        Next
    End Sub

    Private Sub MakeCellsLarger(ByVal sender As Object, _
        ByVal e As EventArgs) Handles Button2.Click

        For Each column As DataGridViewImageColumn _
            In dataGridView1.Columns
            column.Width = column.Width * 2
        Next
        For Each row As DataGridViewRow In dataGridView1.Rows
            If row.IsNewRow Then Continue For
            row.Height = CInt(row.Height * 1.5)
        Next
    End Sub

    Private Function IsAWin() As Boolean
        If ARowIsSame() OrElse AColumnIsSame() OrElse ADiagonalIsSame() Then
            Return True
        Else 
            Return False
        End If
    End Function

    Private Function ARowIsSame() As Boolean
        Dim marking As Bitmap = Nothing
        If marking Is blank Then Return False
        For Each row As DataGridViewRow In dataGridView1.Rows
            If row.IsNewRow Then Continue For
            marking = CType(row.Cells(0).Value, Bitmap)
            If marking IsNot blank Then
                If marking Is row.Cells(1).Value AndAlso _
                    marking Is row.Cells(2).Value Then Return True
            End If
        Next
        Return False
    End Function

    Private Function AColumnIsSame() As Boolean

        Dim columnIndex As Integer = 0
        Dim marking As Bitmap
        Do
            marking = CType(dataGridView1.Rows(0).Cells(columnIndex).Value, _
                Bitmap)
            If marking IsNot blank Then
                If marking Is _
                    dataGridView1.Rows(1).Cells(columnIndex).Value _
                    AndAlso marking Is _
                    dataGridView1.Rows(2).Cells(columnIndex).Value _
                    Then Return True
            End If
            columnIndex = columnIndex + 1
        Loop While columnIndex < _
            dataGridView1.Columns.GetColumnCount( _
            DataGridViewElementStates.Visible)
        Return False
    End Function

    Private Function ADiagonalIsSame() As Boolean

        If LeftToRightDiagonalIsSame() Then Return True
        If RightToLeftDiagonalIsSame() Then Return True
        Return False
    End Function

    Private Function LeftToRightDiagonalIsSame() As Boolean
        Return IsDiagonalSame(0, 2)
    End Function

    Private Function RightToLeftDiagonalIsSame() As Boolean
        Return IsDiagonalSame(2, 0)
    End Function

    Private Function IsDiagonalSame(ByVal startingColumn As Integer, _
        ByVal lastColumn As Integer) As Boolean

        Dim marking As Bitmap = CType( _
            dataGridView1.Rows(0).Cells(startingColumn).Value, Bitmap)
        If marking Is blank Then Return False
        If marking Is dataGridView1.Rows(1).Cells(1).Value AndAlso _
            marking Is dataGridView1.Rows(2).Cells(lastColumn).Value _
            Then Return True
    End Function

    Private Sub ToggleTurn()
        If turn.Text.Equals(xString) Then turn.Text = oString _
        Else turn.Text = xString
    End Sub

    Private Function IsOsTurn() As Boolean
        If turn.Text.Equals(oString) Then Return True _
        Else  : Return False
    End Function

    <STAThread> Public Shared Sub Main()
        Application.Run(New TicTacToe())
    End Sub

End Class


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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