datagridview 暗藏行

datagridview 隐藏行
datagridview 隐藏行，选中一行不能隐藏，选中2行以上才可以，这是怎么回事啊

C# code

 private void lblAddDevice_Click(object sender, EventArgs e)        {                                    for (int i = 0; i < dgvDevice.Rows.Count;i++ )            {                DataGridViewCheckBoxCell chkCell = (DataGridViewCheckBoxCell)dgvDevice.Rows[i].Cells["Check"];                Boolean flag = Convert.ToBoolean(chkCell.Value);                if (flag)                {                    CurrencyManager cm = (CurrencyManager)BindingContext[this.dgvDevice.DataSource];                    cm.SuspendBinding();                   dgvDevice.Rows[i].Visible = false;                   cm.ResumeBinding();                   //disAbleCheck(i);                                  }            }}

C# code

bool flag = Convert.ToBoolean(chkCell.EditedFormattedValue);
[解决办法]
C# code
   for (int i = 0; i < dataGridView1.Rows.Count; i++)            {                DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell)dataGridView1.Rows[i].Cells["Check"];                if ((Boolean)chk.EditedFormattedValue == true)                {}}