[VB.NET]winform中如何在datagrid中使用复选框表示哪几行被选中

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winform中如何在datagrid中使用复选框表示哪几行被选中
如题。想在datagrid中增加一列为checkbox列。怎么做？希望能给出部分代码
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可以参考http://dev.21tx.com/2003/05/23/10191.html
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那个说的是web吧。我要的是winform
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参考这个http://blog.youkuaiyun.com/daniao2003/archive/2007/01/27/1495695.aspx
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Dim mCount As Integer
For mCount = 0 To Me.DataGrid1.RowCount - 1 Step 1
If Me.DataGrid1.Rows(mCount).Cells(0).Value = True Then
Dim str As String = Me.DataGrid1.Rows(mCount).Cells(n).Value ''得到选中行的ID，其中n表示ID或其它你想要获取的值在DataGrid中的显示列数
End If
Next
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