private void LoadCereriSange()
{
List <Cerere> cereriSange = service.GetAllCereriByIdDonator(Username);
BindingSource bindingSource = new BindingSource(cereriSange, null);
dataGridViewCereri.DataSource = cereriSange;
dataGridViewCereri.Columns["Id"].Visible = false;
dataGridViewCereri.Columns["CantitateGlobuleRosii"].Visible = false;
dataGridViewCereri.Columns["CantitatePlasma"].Visible = false;
dataGridViewCereri.Columns["CantitateTrombocite"].Visible = false;
dataGridViewCereri.Columns["Medic"].Visible = false;
dataGridViewCereri.Columns["Grupa"].Visible = false;
dataGridViewCereri.Columns["RH"].Visible = false;
}
