Events for checkbox column in datagridview in c#.net

private void Form1_Load(object sender, EventArgs e)
       {
           DataTable dt = new DataTable();
           dt.Columns.Add("boolvalue", typeof(bool));
           dt.Rows.Add(true);
           dt.Rows.Add(false);
           dt.Rows.Add(true);
           dataGridView1.DataSource = dt;
       }

       private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
       {
           if( e.ColumnIndex == 0) // 0 is the first column, specify the valid index of ur gridview
           {
           bool value = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].EditedFormattedValue;
       }