The correct way for handling this would be to get reference to the parent GridDataItem
(using the NamingContainer
property of your TextBox
control) and check its Selected property. If it is set to true, this
will mean that the item is selected.
Generally, as the name clearly stated, this is a GridClientSelectColumn and you should not use that column for retrieving the selected state of an item.
You can take a look at the following help article for accessing controls in RadGrid:
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