Variable names must be unique within a query batch or stored procedure ERROR

örnek çözüm :

for (int i = 0; i < analiste.VisibleRowCount; i++)
{
if (analiste.Selection.IsRowSelected(i))
{
cmd2.CommandText = Sorgu2;
cmd2.Parameters.Clear();
cmd2.Parameters.AddWithValue(“@giris_tarih”,DateTime.Now);
cmd2.ExecuteNonQuery();
cmd3.ExecuteNonQuery();
}
okuyucu.Close();
}
}
WebMsgBox.Show(“Bilgiler Kayedildi”);
ListeyiDoldur();
cnn1.Close();
cnn2.Close();
cnn3.Close();