Question

I have my query as below

  DataRow dr = objDtModifier.Rows[num];
  var existingRows = resultDataTable.AsEnumerable().Where(row => row == dr);

But existingRows.Count always returns me zero .

Can anyone tell what’s wrong here .

Answer 1

You are comparing a row object from the objDtModifier source colloction with a different set of row objects in a resultDataTable collection which will alway return an empty result set as they are a different set of object references (this is regardless of whether they contain the same data or not).
Is there a property you can test against? eg:

var existingRows = resultDataTable.AsEnumerable().Where(row => row.Id == dr.Id);