Safely Removing DataRow In ForEach

Question

I don\'t understand why this code does not work.

foreach (DataRow dataRow in dataTable.Rows)
{
    if (true)
    {
        dataRow.Delete();
    }
}
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Answer 1

There is an other version of it (I think an easier) what I just used:

int i=0;
while (i < myDataTable.Rows.Count)
{
    if (condition)  //should it be deleted?
        myDataTable.Rows.RemoveAt(i);
    else
        i++;
}

This faster.