WinForm遍历DataGridaView

private void btn_Sure_Click(object sender, EventArgs e)
{
try
{
for (int i = 0; i < myDataGridView1.Rows.Count; i++)
{
if (myDataGridView1.Rows[i].Cells["IsSelect"].Value != null)
{
if ((bool)myDataGridView1.Rows[i].Cells["IsSelect"].Value)
{
listdataRow.Add(myDataGridView1.Rows[i]);
}
}
}
this.DialogResult = System.Windows.Forms.DialogResult.OK;
}
catch (Exception ex)
{
MessageBoxShow(ex.Message);
}
}