All check boxes are checked then Datagridview headerCheckbox will be checked and among them one is unchecked then header will be unchecked

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C#

.NET

Hi Everyone....
I have a datagridview where one checkbox column is there and i have added a header checkbox.
My code for adding a header checkbox and checkbox column is
DataGridViewCheckBoxColumn c1;
CheckBox ckBox;
private void CheckboxSelect_Load(object sender, EventArgs e)
{
c1 = new DataGridViewCheckBoxColumn();

c1.Name = "selection";

c1.HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleCenter;

this.dgvSelectAll.Columns.Add(c1);

this.dgvSelectAll.Rows.Add();

this.dgvSelectAll.Rows.Add();

this.dgvSelectAll.Rows.Add();

this.dgvSelectAll.Rows.Add();

ckBox = new CheckBox();

Rectangle rect =this.dgvSelectAll.GetCellDisplayRectangle(0, -1, true);

ckBox.Size = new Size(18, 18);

ckBox.Location = rect.Location;

this.dgvSelectAll.Controls.Add(ckBox);
}

Is it possible If All check boxes are checked then header Checkbox will be checked and among them (Selected Check boxes)one is unchecked then header will be unchecked ??

Thank You