DatagridView复选框已检查？

// 创建DatagridView控件并设置属性
DataGridView dgv = new DataGridView();
dgv.AllowUserToAddRows = false;
dgv.AllowUserToDeleteRows = false;
dgv.AllowUserToOrderColumns = false;
dgv.AllowUserToResizeColumns = false;

// 创建DataGridViewCheckBoxColumn列并设置属性
DataGridViewCheckBoxColumn checkColumn = new DataGridViewCheckBoxColumn();
checkColumn.HeaderText = "选择";
checkColumn.Name = "checkColumn";
checkColumn.Width = 100;
dgv.Columns.Add(checkColumn);

// 将数据添加到DatagridView控件中
List<DataGridViewRow> rows = new List<DataGridViewRow>();
rows.Add(dgv.Rows[0]);
for (int i = 1; i < dgv.Rows.Count; i++)
{
    rows.Add(dgv.Rows[i]);
    rows[i].Cells[0].Value = true;
}
dgv.DataSource = rows;