DataGridBoolColumn

Hi, I would like edit Datagrid with a bool column. I am not using any sort of exisitig data. I have set a datasource to DataGrid which is empty. I would like to edit my bool column. But the bool column is always on Null state. I hvae set the AllowNull = false,even then also it is showing the Null state. Also i would like to know, how to catch the changes made? If anyone has any suggestions, please let me know. Thanks in advance, Vanaja.

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