var tb = project.Tables["leadTable"];
tb.AddRow(new[]{"123", "321"}); // add demo
tb.AddRow(new[]{"123","654", "987"}); // add demo
var list = tb.GetItems("0-end",true).Select(x=>string.Join(";", x.ToArray())).ToList();
string stream = string.Join(Environment.NewLine, list);
return stream;