1、属性设置checkboxcolumn

name:cb_check     falsevalue:false    truevalue:true
datagridview中的readonly设置为false.

2、  //单项选择设置
private void dgv_zy_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            int count = Convert.ToInt16(dgv_zy.Rows.Count.ToString());
                    for (int i = 0; i < count; i++)

{
DataGridViewCheckBoxCell checkCell = (DataGridViewCheckBoxCell)dgv_zy.Rows[i].Cells["cb_check"];
                Boolean flag = Convert.ToBoolean(checkCell.Value);
                if (flag == true)     //查找被选择的数据行
                {
                    checkCell.Value = false;
                }
                    continue;
             }
        }

3、获取选择的数据
            int count = Convert.ToInt32(dgv_zy.Rows.Count.ToString());
            for (int i = 0; i < count; i++)
            {
               //如果DataGridView是可编辑的，将数据提交，否则处于编辑状态的行无法取到
                      dgv_zy.EndEdit();
                DataGridViewCheckBoxCell checkCell = (DataGridViewCheckBoxCell)dgv_zy.Rows[i].Cells["cb_check"];
                Boolean flag = Convert.ToBoolean(checkCell.Value);
               if (flag == true)     //查找被选择的数据行
                {
                    //从 DATAGRIDVIEW 中获取数据项
               string z_zcode = dgv_zy.Rows[i].Cells[0].Value.ToString().Trim();
              //........................................                }
         }