DataGridView Filtering OnClick Event (C# WinForm)

dataSet.Tables[0].AsEnumerable().Where(c => c.Field<int>("ageColumn") > 3 &&
     c.Field<int>("ageColumn") < 5).Count();

Predicate<DataColumn> clause = c => c.Field<int>("ageColumn") > 3
    && c.Field<int>("ageColumn") < 5;
label1.Tag = clause;

var clause = (sender as Label).Tag as Predicate<DataColumn>;
myDataSource = dataSet.Tables[0].AsEnumerable().Where(clause);

dataSet.Tables[0].AsEnumerable().Where(c => c.Field<int>("ageColumn") > 3 &&
 c.Field<int>("ageColumn") < 5)