c# - Find sum of a column after using binding source filter -

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i using bindingsource.filter small list of rows. either can find sum sum(mycolumn)
or filter using
bindingsource.filter="purchaseid = '" + purchaseid + "'".

how find sum of specific column after filtering?

i found solution using dataset

inventorydatabasedataset.tables["mytable"].compute("sum(mycolumn)", "purchaseid = '" + pid + "'").tostring();

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