DataGridViewImageColumn Class
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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)

System.Object
  System.Windows.Forms.DataGridViewElement
    System.Windows.Forms.DataGridViewBand
      System.Windows.Forms.DataGridViewColumn
        System.Windows.Forms.DataGridViewImageColumn

[ToolboxBitmapAttribute(typeof(DataGridViewImageColumn), "DataGridViewImageColumn.bmp")]
public class DataGridViewImageColumn : DataGridViewColumn

NameDescription
System_CAPS_pubmethodDataGridViewImageColumn()

Initializes a new instance of the DataGridViewImageColumn class, configuring it for use with cell values of type Image.

System_CAPS_pubmethodDataGridViewImageColumn(Boolean)

Initializes a new instance of the DataGridViewImageColumn class, optionally configuring it for use with Icon cell values.

NameDescription
System_CAPS_pubpropertyAutoSizeMode

Gets or sets the mode by which the column automatically adjusts its width.(Inherited from DataGridViewColumn.)

System_CAPS_pubpropertyCellTemplate

Gets or sets the template used to create new cells.(Overrides DataGridViewColumn.CellTemplate.)

System_CAPS_pubpropertyCellType

Gets the run-time type of the cell template.(Inherited from DataGridViewColumn.)

System_CAPS_pubpropertyContextMenuStrip

Gets or sets the shortcut menu for the column.(Inherited from DataGridViewColumn.)

System_CAPS_pubpropertyDataGridView

Gets the DataGridView control associated with this element.(Inherited from DataGridViewElement.)

System_CAPS_pubpropertyDataPropertyName

Gets or sets the name of the data source property or database column to which the DataGridViewColumn is bound.(Inherited from DataGridViewColumn.)

System_CAPS_pubpropertyDefaultCellStyle

Gets or sets the column's default cell style.(Overrides DataGridViewColumn.DefaultCellStyle.)

System_CAPS_pubpropertyDefaultHeaderCellType

Gets or sets the run-time type of the default header cell.(Inherited from DataGridViewBand.)

System_CAPS_pubpropertyDescription

Gets or sets a string that describes the column's image.

System_CAPS_pubpropertyDisplayed

Gets a value indicating whether the band is currently displayed onscreen. (Inherited from DataGridViewBand.)

System_CAPS_pubpropertyDisplayIndex

Gets or sets the display order of the column relative to the currently displayed columns.(Inherited from DataGridViewColumn.)

System_CAPS_pubpropertyDividerWidth

Gets or sets the width, in pixels, of the column divider.(Inherited from DataGridViewColumn.)

System_CAPS_pubpropertyFillWeight

Gets 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.)

System_CAPS_pubpropertyFrozen

Gets or sets a value indicating whether a column will move when a user scrolls the DataGridView control horizontally.(Inherited from DataGridViewColumn.)

System_CAPS_pubpropertyHasDefaultCellStyle

Gets a value indicating whether the DefaultCellStyle property has been set. (Inherited from DataGridViewBand.)

System_CAPS_pubpropertyHeaderCell

Gets or sets the DataGridViewColumnHeaderCell that represents the column header.(Inherited from DataGridViewColumn.)

System_CAPS_protpropertyHeaderCellCore

Gets or sets the header cell of the DataGridViewBand.(Inherited from DataGridViewBand.)

System_CAPS_pubpropertyHeaderText

Gets or sets the caption text on the column's header cell.(Inherited from DataGridViewColumn.)

System_CAPS_pubpropertyIcon

Gets 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.

System_CAPS_pubpropertyImage

Gets 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.

System_CAPS_pubpropertyImageLayout

Gets or sets the image layout in the cells for this column.

System_CAPS_pubpropertyIndex

Gets the relative position of the band within the DataGridView control.(Inherited from DataGridViewBand.)

System_CAPS_pubpropertyInheritedAutoSizeMode

Gets the sizing mode in effect for the column.(Inherited from DataGridViewColumn.)

System_CAPS_pubpropertyInheritedStyle

Gets the cell style currently applied to the column.(Inherited from DataGridViewColumn.)

System_CAPS_pubpropertyIsDataBound

Gets a value indicating whether the column is bound to a data source.(Inherited from DataGridViewColumn.)

System_CAPS_protpropertyIsRow

Gets a value indicating whether the band represents a row.(Inherited from DataGridViewBand.)

System_CAPS_pubpropertyMinimumWidth

Gets or sets the minimum width, in pixels, of the column.(Inherited from DataGridViewColumn.)

System_CAPS_pubpropertyName

Gets or sets the name of the column.(Inherited from DataGridViewColumn.)

System_CAPS_pubpropertyReadOnly

Gets or sets a value indicating whether the user can edit the column's cells.(Inherited from DataGridViewColumn.)

System_CAPS_pubpropertyResizable

Gets or sets a value indicating whether the column is resizable.(Inherited from DataGridViewColumn.)

System_CAPS_pubpropertySelected

Gets or sets a value indicating whether the band is in a selected user interface (UI) state.(Inherited from DataGridViewBand.)

System_CAPS_pubpropertySite

This API supports the product infrastructure and is not intended to be used directly from your code. Gets or sets the site of the column.(Inherited from DataGridViewColumn.)

System_CAPS_pubpropertySortMode

Gets or sets the sort mode for the column.(Inherited from DataGridViewColumn.)

System_CAPS_pubpropertyState

Gets the user interface (UI) state of the element.(Inherited from DataGridViewElement.)

System_CAPS_pubpropertyTag

Gets or sets the object that contains data to associate with the band.(Inherited from DataGridViewBand.)

System_CAPS_pubpropertyToolTipText

Gets or sets the text used for ToolTips.(Inherited from DataGridViewColumn.)

System_CAPS_pubpropertyValuesAreIcons

Gets or sets a value indicating whether cells in this column display Icon values.

System_CAPS_pubpropertyValueType

Gets or sets the data type of the values in the column's cells.(Inherited from DataGridViewColumn.)

System_CAPS_pubpropertyVisible

Gets or sets a value indicating whether the column is visible.(Inherited from DataGridViewColumn.)

System_CAPS_pubpropertyWidth

Gets or sets the current width of the column.(Inherited from DataGridViewColumn.)

NameDescription
System_CAPS_pubmethodClone()

Creates an exact copy of this column.(Overrides DataGridViewColumn.Clone().)

System_CAPS_pubmethodDispose()

Releases all resources used by the DataGridViewBand. (Inherited from DataGridViewBand.)

System_CAPS_protmethodDispose(Boolean)

Releases the unmanaged resources used by the DataGridViewBand and optionally releases the managed resources.(Inherited from DataGridViewColumn.)

System_CAPS_pubmethodEquals(Object)

Determines whether the specified object is equal to the current object.(Inherited from Object.)

System_CAPS_protmethodFinalize()

Releases the resources associated with the band.(Inherited from DataGridViewBand.)

System_CAPS_pubmethodGetHashCode()

Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodGetPreferredWidth(DataGridViewAutoSizeColumnMode, Boolean)

Calculates the ideal width of the column based on the specified criteria.(Inherited from DataGridViewColumn.)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_protmethodMemberwiseClone()

Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_protmethodOnDataGridViewChanged()

Called when the band is associated with a different DataGridView.(Inherited from DataGridViewBand.)

System_CAPS_protmethodRaiseCellClick(DataGridViewCellEventArgs)

Raises the DataGridView.CellClick event. (Inherited from DataGridViewElement.)

System_CAPS_protmethodRaiseCellContentClick(DataGridViewCellEventArgs)

Raises the DataGridView.CellContentClick event. (Inherited from DataGridViewElement.)

System_CAPS_protmethodRaiseCellContentDoubleClick(DataGridViewCellEventArgs)

Raises the DataGridView.CellContentDoubleClick event. (Inherited from DataGridViewElement.)

System_CAPS_protmethodRaiseCellValueChanged(DataGridViewCellEventArgs)

Raises the DataGridView.CellValueChanged event. (Inherited from DataGridViewElement.)

System_CAPS_protmethodRaiseDataError(DataGridViewDataErrorEventArgs)

Raises the DataGridView.DataError event. (Inherited from DataGridViewElement.)

System_CAPS_protmethodRaiseMouseWheel(MouseEventArgs)

Raises the Control.MouseWheel event. (Inherited from DataGridViewElement.)

System_CAPS_pubmethodToString()

Gets a string that describes the column.(Overrides DataGridViewColumn.ToString().)

NameDescription
System_CAPS_pubeventDisposed

Occurs when the DataGridViewColumn is disposed.(Inherited from DataGridViewColumn.)

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 null or DBNull.Value, set the DataGridViewCellStyle.NullValue property of the cell style object returned by the DefaultCellStyle property to null 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 null 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 null.

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.

using System.IO;
using System.Windows.Forms;
using System.Drawing;
using System;

public class TicTacToe : System.Windows.Forms.Form
{
    public TicTacToe()
    {
        blank = new Bitmap(new MemoryStream(blankImage));
        x = new Bitmap(new MemoryStream(xImage));
        o = new Bitmap(new MemoryStream(oImage));

        this.AutoSize = true;
        SetupButtons();
        InitializeDataGridView(null, null);
    }

    private DataGridView dataGridView1;
    private Button Button1 = new Button();
    private Label turn = new Label();
    private Button Button2 = new Button();
    private Button Button3 = new Button();
    private Button Button4 = new Button();
    private Button Button5 = new Button();
    private FlowLayoutPanel Panel1 = new FlowLayoutPanel();

    #region "bitmaps"
    private byte[] oImage = new byte[] {
        0x42, 0x4D, 0xC6, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x76, 
        0x0, 0x0, 0x0, 0x28, 0x0, 0x0, 0x0, 0xB, 0x0, 0x0, 0x0, 0xA,
        0x0, 0x0, 0x0, 0x1, 0x0, 0x4, 0x0, 0x0, 0x0, 0x0, 0x0, 0x50,
        0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x10,
        0x0, 0x0, 0x0, 0x10, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
        0x0, 0x80, 0x0, 0x0, 0x80, 0x0, 0x0, 0x0, 0x80, 0x80, 0x0, 
        0x80, 0x0, 0x0, 0x0, 0x80, 0x0, 0x80, 0x0, 0x80, 0x80, 0x0, 
        0x0, 0xC0, 0xC0, 0xC0, 0x0, 0x80, 0x80, 0x80, 0x0, 0x0, 0x0,
        0xFF, 0x0, 0x0, 0xFF, 0x0, 0x0, 0x0, 0xFF, 0xFF, 0x0, 0xFF, 
        0x0, 0x0, 0x0, 0xFF, 0x0, 0xFF, 0x0, 0xFF, 0xFF, 0x0, 0x0, 
        0xFF, 0xFF, 0xFF, 0x0, 0xFF, 0xFF, 0x0, 0xF, 0xFF, 0xF0, 
        0x0, 0x0, 0xFF, 0x0, 0xFF, 0xF0, 0xF, 0xF0, 0x0, 0x0, 0xF0, 
        0xFF, 0xFF, 0xFF, 0xF0, 0xF0, 0x0, 0x0, 0xF0, 0xFF, 0xFF, 
        0xFF, 0xF0, 0xF0, 0x0, 0x0, 0xF, 0xFF, 0xFF, 0xFF, 0xFF, 
        0x0, 0x0, 0x0, 0xF, 0xFF, 0xFF, 0xFF, 0xFF, 0x0, 0x0, 0x0, 
        0xF0, 0xFF, 0xFF, 0xFF, 0xF0, 0xF0, 0x0, 0x0, 0xF0, 0xFF, 
        0xFF, 0xFF, 0xF0, 0xF0, 0x0, 0x0, 0xFF, 0x0, 0xFF, 0xF0, 
        0xF, 0xF0, 0x0, 0x0, 0xFF, 0xFF, 0x0, 0xF, 0xFF, 0xF0, 0x0, 
        0x0};

    private byte[] xImage = new byte[]{
        0x42, 0x4D, 0xC6, 0x0, 0x0, 0x0, 0x0, 
        0x0, 0x0, 0x0, 0x76, 0x0, 0x0, 0x0, 0x28, 0x0, 0x0, 0x0, 
        0xB, 0x0, 0x0, 0x0, 0xA, 0x0, 0x0, 0x0, 0x1, 0x0, 0x4, 0x0, 
        0x0, 0x0, 0x0, 0x0, 0x50, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
        0x0, 0x0, 0x0, 0x0, 0x10, 0x0, 0x0, 0x0, 0x10, 0x0, 0x0, 
        0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x80, 0x0, 0x0, 0x80, 
        0x0, 0x0, 0x0, 0x80, 0x80, 0x0, 0x80, 0x0, 0x0, 0x0, 0x80, 
        0x0, 0x80, 0x0, 0x80, 0x80, 0x0, 0x0, 0xC0, 0xC0, 0xC0, 0x0,
        0x80, 0x80, 0x80, 0x0, 0x0, 0x0, 0xFF, 0x0, 0x0, 0xFF, 0x0, 
        0x0, 0x0, 0xFF, 0xFF, 0x0, 0xFF, 0x0, 0x0, 0x0, 0xFF, 0x0, 
        0xFF, 0x0, 0xFF, 0xFF, 0x0, 0x0, 0xFF, 0xFF, 0xFF, 0x0, 
        0xF0, 0xFF, 0xFF, 0xFF, 0xF0, 0xF0, 0x0, 0x0, 0xFF, 0xF, 
        0xFF, 0xFF, 0xF, 0xF0, 0x0, 0x0, 0xFF, 0xF0, 0xFF, 0xF0, 
        0xFF, 0xF0, 0x0, 0x0, 0xFF, 0xFF, 0xF, 0xF, 0xFF, 0xF0, 0x0,
        0x0, 0xFF, 0xFF, 0xF, 0xF, 0xFF, 0xF0, 0x0, 0x0, 0xFF, 0xFF,
        0xF, 0xF, 0xFF, 0xF0, 0x0, 0x0, 0xFF, 0xF0, 0xFF, 0xF0, 
        0xFF, 0xF0, 0x0, 0x0, 0xFF, 0xF, 0xFF, 0xFF, 0xF, 0xF0, 0x0,
        0x0, 0xF0, 0xFF, 0xFF, 0xFF, 0xF0, 0xF0, 0x0, 0x0, 0xFF, 
        0xFF, 0xFF, 0xFF, 0xFF, 0xF0, 0x0, 0x0};

    private byte[] blankImage = new byte[] {
        0x42, 0x4D, 0xC6, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x76, 
        0x0, 0x0, 0x0, 0x28, 0x0, 0x0, 0x0, 0xB, 0x0, 0x0, 0x0, 0xA,
        0x0, 0x0, 0x0, 0x1, 0x0, 0x4, 0x0, 0x0, 0x0, 0x0, 0x0, 0x50,
        0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x10,
        0x0, 0x0, 0x0, 0x10, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
        0x0, 0x80, 0x0, 0x0, 0x80, 0x0, 0x0, 0x0, 0x80, 0x80, 0x0, 
        0x80, 0x0, 0x0, 0x0, 0x80, 0x0, 0x80, 0x0, 0x80, 0x80, 0x0, 
        0x0, 0xC0, 0xC0, 0xC0, 0x0, 0x80, 0x80, 0x80, 0x0, 0x0, 0x0,
        0xFF, 0x0, 0x0, 0xFF, 0x0, 0x0, 0x0, 0xFF, 0xFF, 0x0, 0xFF, 
        0x0, 0x0, 0x0, 0xFF, 0x0, 0xFF, 0x0, 0xFF, 0xFF, 0x0, 0x0, 
        0xFF, 0xFF, 0xFF, 0x0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF0, 
        0x0, 0x0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF0, 0x0, 0x0, 
        0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF0, 0x0, 0x0, 0xFF, 0xFF, 
        0xFF, 0xFF, 0xFF, 0xF0, 0x0, 0x0, 0xFF, 0xFF, 0xFF, 0xFF, 
        0xFF, 0xF0, 0x0, 0x0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF0, 
        0x0, 0x0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF0, 0x0, 0x0, 
        0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF0, 0x0, 0x0, 0xFF, 0xFF, 
        0xFF, 0xFF, 0xFF, 0xF0, 0x0, 0x0, 0xFF, 0xFF, 0xFF, 0xFF, 
        0xFF, 0xF0, 0x0, 0x0};
    #endregion

    private Bitmap blank;
    private Bitmap x;
    private Bitmap o;
    private string xString = "X's turn";
    private string oString = "O's turn";
    private string gameOverString = "Game Over";
    private int bitmapPadding = 6;

    private void InitializeDataGridView(object sender,
        EventArgs e)
    {
        this.Panel1.SuspendLayout();
        this.SuspendLayout();

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

        this.Panel1.ResumeLayout(false);
        this.ResumeLayout(false);
    }

    private void ConfigureForm()
    {
        AutoSize = true;
        turn.Size = new System.Drawing.Size(75, 34);
        turn.TextAlign = ContentAlignment.MiddleLeft;
        turn.Text = xString;

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

        ClientSize = new System.Drawing.Size(355, 200);
        Controls.Add(this.Panel1);
        Text = "TicTacToe";

        dataGridView1 = new System.Windows.Forms.DataGridView();
        dataGridView1.Location = new Point(120, 0);
        dataGridView1.AllowUserToAddRows = false;
        dataGridView1.CellClick += new
            DataGridViewCellEventHandler(dataGridView1_CellClick);
        dataGridView1.CellMouseEnter += new
            DataGridViewCellEventHandler(dataGridView1_CellMouseEnter);
        dataGridView1.CellMouseLeave += new
            DataGridViewCellEventHandler(dataGridView1_CellMouseLeave);

        Controls.Add(dataGridView1);
    }

    private void SetupButtons()
    {
        Button1.AutoSize = true;
        SetupButton(Button1, "Restart", new EventHandler(Reset));
        Panel1.Controls.Add(turn);
        SetupButton(Button2, "Increase Cell Size", new EventHandler(MakeCellsLarger));
        SetupButton(Button3, "Stretch Images", new EventHandler(Stretch));
        SetupButton(Button4, "Zoom Images", new EventHandler(ZoomToImage));
        SetupButton(Button5, "Normal Images", new EventHandler(NormalImage));
    }

    private void SetupButton(Button button, string buttonLabel, EventHandler handler)
    {
        Panel1.Controls.Add(button);
        button.Text = buttonLabel;
        button.AutoSize = true;
        button.Click += handler;
    }

    private void CreateColumns()
    {
        DataGridViewImageColumn imageColumn;
        int columnCount = 0;
        do
        {
            Bitmap unMarked = 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;
            dataGridView1.Columns.Add(imageColumn);
            columnCount = columnCount + 1;
        }
        while (columnCount < 3);
    }

    private void CreateRows()
    {
        dataGridView1.Rows.Add();
        dataGridView1.Rows.Add();
        dataGridView1.Rows.Add();
    }

    private void SizeGrid()
    {
        dataGridView1.ColumnHeadersVisible = false;
        dataGridView1.RowHeadersVisible = false;
        dataGridView1.AllowUserToResizeColumns = false;;
        dataGridView1.AllowUserToResizeRows = false;
        dataGridView1.BorderStyle = BorderStyle.None;

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

        dataGridView1.AutoSize = true;
    }

    private void Reset(object sender, System.EventArgs e)
    {
        dataGridView1.Dispose();
        InitializeDataGridView(null, null);
    }

    private void dataGridView1_CellClick(object sender,
        DataGridViewCellEventArgs e)
    {

        if (turn.Text.Equals(gameOverString)) { return; }

        DataGridViewImageCell cell = (DataGridViewImageCell)
            dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex];

        if (cell.Value == blank)
        {
            if (IsOsTurn())
            {
                cell.Value = o;
            }
            else
            {
                cell.Value = x;
            }
            ToggleTurn();
        }
        if (IsAWin())
        {
            turn.Text = gameOverString;
        }
    }

    private void dataGridView1_CellMouseEnter(object sender,
        DataGridViewCellEventArgs e)
    {
        Bitmap markingUnderMouse = (Bitmap)dataGridView1.
               Rows[e.RowIndex].
               Cells[e.ColumnIndex].Value;

        if (markingUnderMouse == blank)
        {
            dataGridView1.Cursor = Cursors.Default;
        }
        else if (markingUnderMouse == o || markingUnderMouse == x)
        {
            dataGridView1.Cursor = Cursors.No;
            ToolTip(e, true);
        }
    }

    private void ToolTip(DataGridViewCellEventArgs e, bool showTip)
    {
        DataGridViewImageCell cell = (DataGridViewImageCell)
            dataGridView1
            .Rows[e.RowIndex].Cells[e.ColumnIndex];
        DataGridViewImageColumn imageColumn =
            (DataGridViewImageColumn)
            dataGridView1.Columns[cell.ColumnIndex];

        if (showTip) cell.ToolTipText = imageColumn.Description;
        else { cell.ToolTipText = String.Empty; }
    }

    private void dataGridView1_CellMouseLeave(object sender,
        DataGridViewCellEventArgs e)
    {
        ToolTip(e, false);
        dataGridView1.Cursor = Cursors.Default;
    }

    private void Stretch(object sender, EventArgs e)
    {
        foreach (DataGridViewImageColumn column in
            dataGridView1.Columns)
        {
            column.ImageLayout = DataGridViewImageCellLayout.Stretch;
            column.Description = "Stretched";
        }
    }

    private void ZoomToImage(object sender, EventArgs e)
    {

        foreach (DataGridViewImageColumn column in
            dataGridView1.Columns)
        {
            column.ImageLayout = DataGridViewImageCellLayout.Zoom;
            column.Description = "Zoomed";
        }
    }

    private void NormalImage(object sender, EventArgs e)
    {

        foreach (DataGridViewImageColumn column in
            dataGridView1.Columns)
        {
            column.ImageLayout = DataGridViewImageCellLayout.Normal;
            column.Description = "Normal";
        }
    }

    private void MakeCellsLarger(object sender, EventArgs e)
    {
        foreach (DataGridViewImageColumn column in
            dataGridView1.Columns)
        {
            column.Width = column.Width * 2;
        }
        foreach (DataGridViewRow row in dataGridView1.Rows)
        {
            if (row.IsNewRow) break;
            row.Height = (int)(row.Height * 1.5);
        }
    }

    private bool IsAWin()
    {
        if (ARowIsSame() || AColumnIsSame() || ADiagonalIsSame())
            return true;
        else return false;
    }

    private bool ARowIsSame()
    {
        Bitmap marking = null;

        foreach (DataGridViewRow row in dataGridView1.Rows)
        {
            if (row.IsNewRow) break;
            marking = (Bitmap)row.Cells[0].Value;
            if (marking != blank)
            {
                if (marking == row.Cells[1].Value &&
                    marking == row.Cells[2].Value) return true;
            }
        }
        return false;
    }

    private bool AColumnIsSame()
    {
        int columnIndex = 0;
        Bitmap marking;
        do
        {
            marking = (Bitmap)
                dataGridView1.Rows[0].Cells[columnIndex].Value;
            if (marking != blank)
            {
                if (marking == (Bitmap)dataGridView1.Rows[1]
                    .Cells[columnIndex].Value
                    && marking == (Bitmap)dataGridView1.Rows[2].
                    Cells[columnIndex].Value) return true;
            }
            columnIndex = columnIndex + 1;
        }
        while (columnIndex < dataGridView1.Columns.GetColumnCount(
            DataGridViewElementStates.Visible));
        return false;
    }

    private bool ADiagonalIsSame()
    {
        if (LeftToRightDiagonalIsSame()) { return true; }
        if (RightToLeftDiagonalIsSame()) { return true; }
        return false;
    }

    private bool LeftToRightDiagonalIsSame()
    {
        return IsDiagonalSame(0, 2);
    }

    private bool RightToLeftDiagonalIsSame()
    {
        return IsDiagonalSame(2, 0);
    }

    private bool IsDiagonalSame(int startingColumn, int lastColumn)
    {
        Bitmap marking = (Bitmap)dataGridView1.Rows[0]
            .Cells[startingColumn].Value;

        if (marking == blank) return false;
        if (marking == dataGridView1.Rows[1].Cells[1]
            .Value && marking == dataGridView1.Rows[2]
            .Cells[lastColumn].Value) return true;

        return false;
    }

    private void ToggleTurn()
    {
        if (turn.Text.Equals(xString)) { turn.Text = oString; }
        else { turn.Text = xString; }
    }

    private bool IsOsTurn()
    {
        if (turn.Text.Equals(oString)) return true;
        return false;
    }

    [STAThread]
    public static void Main()
    {
        Application.Run(new TicTacToe());
    }

}

.NET Framework
Available since 2.0

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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