DataGridView.ColumnCount Property

 
System_CAPS_noteNote

The .NET API Reference documentation has a new home. Visit the .NET API Browser on docs.microsoft.com to see the new experience.

Gets or sets the number of columns displayed in the DataGridView.

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

[BrowsableAttribute(false)]
public int ColumnCount { get; set; }

Property Value

Type: System.Int32

The number of columns displayed in the DataGridView.

Exception Condition
ArgumentOutOfRangeException

The specified value when setting this property is less than 0.

InvalidOperationException

When setting this property, the DataSource property has been set.

Setting the ColumnCount property to 0 will remove all columns from the DataGridView.

If ColumnCount is reset to a value less than the current value, columns will be removed from the end of the Columns collection. If ColumnCount is set to a value greater than the current value, columns will be added to the end of the Columns collection.

This property can be used with the RowCount property to create a simple DataGridView for displaying and editing text.

For more information about handling events, see NIB: Consuming Events.

The following code example demonstrates how to set theColumnHeadersDefaultCellStyle, AutoSizeRowsMode, ColumnHeadersBorderStyle, CellBorderStyle, GridColor, BackgroundColor, RowHeadersVisible, SelectionMode, ColumnCount, and MultiSelect properties. In addition, the code example demonstrates how to set the DataGridViewColumn.Name and DataGridViewColumn.DefaultCellStyle properties. To run this example, paste the code into a form that contains a DataGridView named dataGridView1, and then call the SetUpDataGridView method from the form's constructor or Load event handler. Ensure all events are associated with their event handlers.

private void SetUpDataGridView()
{
    this.Controls.Add(dataGridView1);
    dataGridView1.ColumnCount = 5;
    DataGridViewCellStyle style = 
        dataGridView1.ColumnHeadersDefaultCellStyle;
    style.BackColor = Color.Navy;
    style.ForeColor = Color.White;
    style.Font = new Font(dataGridView1.Font, FontStyle.Bold);

    dataGridView1.EditMode = DataGridViewEditMode.EditOnEnter;
    dataGridView1.Name = "dataGridView1";
    dataGridView1.Location = new Point(8, 8);
    dataGridView1.Size = new Size(500, 300);
    dataGridView1.AutoSizeRowsMode = 
        DataGridViewAutoSizeRowsMode.DisplayedCellsExceptHeaders;
    dataGridView1.ColumnHeadersBorderStyle = 
        DataGridViewHeaderBorderStyle.Raised;
    dataGridView1.CellBorderStyle = DataGridViewCellBorderStyle.Single;
    dataGridView1.GridColor = SystemColors.ActiveBorder;
    dataGridView1.RowHeadersVisible = false;

    dataGridView1.Columns[0].Name = "Release Date";
    dataGridView1.Columns[1].Name = "Track";
    dataGridView1.Columns[1].DefaultCellStyle.Alignment = 
        DataGridViewContentAlignment.MiddleCenter;
    dataGridView1.Columns[2].Name = "Title";
    dataGridView1.Columns[3].Name = "Artist";
    dataGridView1.Columns[4].Name = "Album";

    // Make the font italic for row four.
    dataGridView1.Columns[4].DefaultCellStyle.Font = new Font(DataGridView.DefaultFont, FontStyle.Italic);

    dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
    dataGridView1.MultiSelect = false;

    dataGridView1.BackgroundColor = Color.Honeydew;

    dataGridView1.Dock = DockStyle.Fill;

    dataGridView1.CellFormatting += new DataGridViewCellFormattingEventHandler(dataGridView1_CellFormatting);
    dataGridView1.CellParsing += new DataGridViewCellParsingEventHandler(dataGridView1_CellParsing);
    addNewRowButton.Click += new EventHandler(addNewRowButton_Click);
    deleteRowButton.Click += new EventHandler(deleteRowButton_Click);
    ledgerStyleButton.Click += new EventHandler(ledgerStyleButton_Click);
    dataGridView1.CellValidating += new DataGridViewCellValidatingEventHandler(dataGridView1_CellValidating);

}

.NET Framework
Available since 2.0
Return to top
Show: