首先切换到设计界面，点击dataGridView的右上角（鼠标轻轻移动上去）的一个小箭头，点击之后选择Edit Columns（编辑列……），然后再弹出的框框中点击左下角的Add……按钮，弹出添加列的框框，然后在下拉列表中选择添加DataGridViewCheckboxColumn。
判断是否选中：
(bool)DataGridView1.Rows[索引].Cells[索引].FormattedValue是否为true。
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