@Akhila_Ashok
have a look on the demo doing it with LINQ, Select-Add.Row Approach
Demo_WhenPresent_ThenUpdate_OtherCol.xaml (7.9 KB)
LINQ is about retrieval (getting something) and updating a column is not returning something.
With invoke code and the setField Method an Update can be done in case of it is absolutely needed
Update_InvokeCode_Demo_SetField.xaml (6.6 KB)