确保选择适当的选择选项：

 myDataGridView.SelectionMode = DataGridViewSelectionMode.RowHeaderSelect 

请参阅：

https://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.selectionmode%28v=vs.110% 29.aspx [ ^ ]，

https://msdn.microsoft.com/en-us/library/3c89df86%28v=vs.110%29.aspx [ ^ ]。

-SA

E>

I have created a workable program that uses several identical user controls containing text boxes and a datagridview control. Every things works as planned except clicking on the datagridview control row header does not select the row. What could cause a row to not be selectable?

Make sure you choose appropriate selection option:

myDataGridView.SelectionMode = DataGridViewSelectionMode.RowHeaderSelect

Please see:
https://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.selectionmode%28v=vs.110%29.aspx[^],
https://msdn.microsoft.com/en-us/library/3c89df86%28v=vs.110%29.aspx[^].

—SA