Changing the Selected Value Of the ComboBox when Selected value of Datagrid Changed

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C#

WPF

C#4.0

i have a ComboBox and data grid i binding the ComboBox and It is ok and data grid to the issue is i am try to change the Selected value of the Combobox when the selected item in data grid changed and this is the

private void DGV_Medecines_SelectedCellsChanged(object sender, SelectedCellsChangedEventArgs e)
{
   Cls_MedecationController Med=new Cls_MedecationController();
   DataTable dt = new DataTable();
   try
   {
      dt = ((DataRowView)this.DGV_Medecines.SelectedItem).DataView.ToTable();                
      this.cmx_Arab.Text = Med.Get_ArabName(dt.Rows[this.DGV_Medecines.SelectedIndex]["Name_latin"].ToString());
   }
   catch
   {
   }
}

this is the cod of CMX Binding

DataTable dt = new DataTable();
            this.FacadeMed = new Cls_MedecationController();
            dt = this.FacadeMed.SellectAllMed();
            //this.cmx_Arab.ItemsSource = dt.DefaultView;
            this.Cmx_Latin.ItemsSource = dt.DefaultView;