'Get specific value from datatable into datagrid - WPF

I have a datagrid that looks like:

    Date| 1 | 1 | 2 | 2 |
ID |Name|AM|PM |AM |PM |
101|Joy |* | * | * | *  |

Where there are asterixes '*', I need to put 'P'. My datatable looks like:

ID |Name|Date|AM|
101|Joy | 1  |P |

How can I assign a 'P' value with the matching ID, Date and AM from the datatable to the datagrid?



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