DataTable Filter From Code Side C#
Email      Age      Team
x@x.com    25       BarcelonaFC
y@y.com    32       BesiktasJK
z@z.com    18       Napoli
y@y.com    19       Boca Juniors
x@x.com    36       Internazionale

Email      Age      Team
x@x.com    25       BarcelonaFC
y@y.com    32       BesiktasJK
z@z.com    18       Napoli

var dt = new DataTable();
dt = yourCurrentDataTable.DefaultView.ToTable(true, "Email", "Age", "Team");

class Data
{
  public int Age;
  public string Team;
}

Dictionary<string, MyData> dic = new Dictionary<string, MyData>();
foreach(DataRow row in YourDataTable)
{
  if(!dic.ContainsKey(row[.. email ..]))
  {
    dic.Add(..., ...);
  }
}