SpringModEdit.Mod.DeleteUnit C# (CSharp) Method

        public void DeleteUnit(string unitId)
        {
            Units[unitId] = null;
        }

 private void deleteUnitToolStripMenuItem_Click(object sender, EventArgs e)
 {
     if (tabControl1.SelectedTab != null)
     {
         string id = tabControl1.SelectedTab.Text;
         try {
             mod.DeleteUnit(id);
         } catch (Exception ex) {
             MessageBox.Show("Error while deleting " + id + "\r\n" + ex.Message, "Deleting errror", MessageBoxButtons.OK, MessageBoxIcon.Warning);
         }
         tabControl1.TabPages.Remove(tabControl1.SelectedTab);
     }
 }