How I can filter a dataTable with Linq to datatable?

You are better of using DataTable.Select method, but if you have to use LINQ then you can try:

DataTable selectedTable = tb.AsEnumerable()                            .Where(r => r.Field<string>("Modul") == value)                            .CopyToDataTable();

This would create a new DataTable based on filtered values.

If you use DataTable.Select

string expression = "Modul =" + value;DataRow[] selectedRows = tb.Select(expression);

You can use condition to check rows exist in addition before casting. System.Linq namespace is required for Any() to work

var rows = values.AsEnumerable().Where            (row => row.Field<string>("Status") == action);//get the rows where the status is equal to actionif(rows.Any()){    DataTable dt = rows.CopyToDataTable<DataRow>();//Copying the rows into the DataTable as DataRow}

To Retrieve the DataTable based on filtering the list of item.(i.e.,if any of the list item is present in datatable, that matched result will received.

 List<string>item=new List<string>(){"TG1","TG2"};      DataTable tbsplit = (from a in tbl.AsEnumerable()              where item.Any(x => a.Field<string>("CSubset").ToUpper().Contains(x.ToUpper()))              select a).CopyToDataTable();//By Executing this, the Filter DataTable is obtained