Deleting specific rows from DataTable

I want to delete some rows from DataTable, but it gives an error like this,

Collection was modified; enumeration operation might not execute

I use for deleting this code,

foreach(DataRow dr in dtPerson.Rows){
    if(dr["name"].ToString()=="Joe")
        dr.Delete();
}

So, what is the problem and how to fix it? Which method do you advise?