Develop an Invoice Page ASP.NET & VB.NET

I have already develop add new invoice page but I need some modification on this page to meed my requirements as following: • Programming should be in VB.NET. • You can use any technology or tool like Ajax, Angular, JavaScript, JSON. • Modification should be in the current VS 2017 project file . Business Requirements: 1. Interface should be in both Arabic & English ( already it is bi-language ) 2. User click ( add new invoice ) from Invoices page. 3. Data should be saved in INVOICES table. 4. Ability to use shortcut in the new Invoice page for example F5 to save the invoice. 5. While entering new invoice, user can search for customer by number or name. 6. While entering new invoice, user can search for sales man by number or name. 7. When user select a customer, salesman ( EmpID ) and currency ( Currancy ) should be change based on the value in CUSTOMERS table. 8. User can add new item by show popup form with few field from ITEMS table for example ( Item Code – Item Name ) and when user click save it saved in ITEMS table and the new item became in the details gridview 9. User can enter adding row to the details gridview directly not by using add button (current method). 10. In Details INVOICES_DETAIL table: a. Data for details should be in editable gridview. b. While entering invoice details, user can search for item by number or name. c. Once user select item, Quantity should be 1, unit should be selected as per the (UnitID), unit and it should show the default price ( Price ) in ITEMS table. d. Show field for Total price for each item in the details gridview. e. If user change quantity or price, total price should be changed. f. User not allowed putting zero or negative number in Quantity or Price fields. g. Show Delete button on each row in details gridview. h. When user click save in the invoice page: I. If invoice type is Cash, it should show popup form ( Modal ) to ask user to select payment method tblMOP table and the amount for each method by adding row in gridview INVOICES_PAYMENT table so total amount in this gridview should be equaled the invoice total. Then user will click save and system should system should save the invoice data in both tables INVOICES , INVOICES_DETAIL & INVOICES_PAYMENT and show popup message ( Saved Successfully) and then redirect to main page. ( Check the attached image ) II. If invoice type is Credit, system should save the invoice data in both tables (INVOICES) & (INVOICES_DETAIL ) and show popup message ( Saved Successfully ) and then redirect to main page. 11. Total invoice should be calculated automatically based on the total value in details gridview. 12. It should include one page for new invoice and one page for edit invoice.