how test Prefix IDs and Save item after testing

Question

Hello Developers

 

Please help me , i have prefix IDs Items when we insert all items not save if its not code testing for Barcode IDs . I mean that before the insert item to check Prefix and then save item .

 

now i know who to test Prefix IDs like below : 

 

//check if prefix is true

Decimal FirstFourDigits = Decimal.Parse(TextBox4.Text.Substring(0,3));

if (FirstFourDigits != 120)

{

Label8.Text = "This Barcode Is'Not Correct !";

}

else

{

label8.Text= " Is correct"; 

} 

 

 

and alse i need to apply for Searching