c# - Expression in DataTable -

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i have simple code:

    currentdatatable.columns.add("active", type.gettype("system.boolean"));     currentdatatable.columns.add("symbol", type.gettype("system.string"));     currentdatatable.primarykey = new datacolumn[] {currentdatatable.columns[1]};      string filterexpression = "symbol = aaa";     datarow[] existingrows = currentdatatable.select(filterexpression);

when executing, error: cannot find column [aaa].

what doing wrong??

if want "aaa" interpreted string, use: 

string filterexpression = "symbol = 'aaa'";

from datacolumn.expression documentation:

when create expression filter, enclose strings single quotation marks:


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