I made a sample application.

Author: oguzhanKomcu

Custom_Functions/BusTicketApp.Designer.cs

@@ -292,7 +292,7 @@ private void btnGetReport_Click(object sender, EventArgs e)
  REPORT.Items.Add(user1);
 
  }
- REPORT.Items.Add($"TOTAL GAINS : {totalprice[0]}");
+ REPORT.Items.Add($"TOTAL GAINS : {totalprice[0]} TL ");
 
 
  }