How to have Checkbox as ColumnHeader of dataGridView

Question

I\'m developing a window application in C# VS2005. I have a dataGridView in which the first column has Checkboxes. Now i want the Column header also to be a CheckBox which i

Answer 1

The above solution is kind of good, but there is also an easier way! Simply add these two methods and then you would have what you want!

First add a show_chkBox method to your code and call it in the onload function of your form or after creating your DataGridView:

 private void show_chkBox()
 {
     Rectangle rect = dataGridView1.GetCellDisplayRectangle(0, -1, true);
     // set checkbox header to center of header cell. +1 pixel to position 
     rect.Y = 3;
     rect.X = rect.Location.X + (rect.Width/4);
     CheckBox checkboxHeader = new CheckBox();
     checkboxHeader.Name = "checkboxHeader";
     //datagridview[0, 0].ToolTipText = "sdfsdf";
     checkboxHeader.Size = new Size(18, 18);
     checkboxHeader.Location = rect.Location;
     checkboxHeader.CheckedChanged += new EventHandler(checkboxHeader_CheckedChanged);
     dataGridView1.Controls.Add(checkboxHeader);
 }

and then you would have the checkbox in the header.

For the selecting problem, just add this code:

private void checkboxHeader_CheckedChanged(object sender, EventArgs e)
{             
    CheckBox headerBox = ((CheckBox)dataGridView1.Controls.Find("checkboxHeader", true)[0]);
    int index = 0;
    for (int i = 0; i < dataGridView1.RowCount; i++)
    {
        dataGridView1.Rows[i].Cells[0].Value = headerBox.Checked;
    }
}