Page_Init Page_Load

cmdINew_Click cmdISave_Click cmdIDelete_Click

cmdISubmit_Click cmdIClear_Click

gridLineItem_RowEditing gridLineItem_RowDeleting

UpdateGridLineItem ShowInvoice FillProduct

txtPassLookupValues_TextChanged

InitializeSystemVariables

Event of Main menu

Event of Edit product menu

Event of Grid line button

Function to process data

Function to Initial database connection (Utilities.vb)

Function receive data returnfrom frmListOfValue

Query Product from database and fill into textbox

Query Invoice to fill into textbox and Query InvoiceLineItem to set in

variable Collection (row_coll)

Read variable Collection (row_coll) and set to variable DataTable, Datarow before set to GridView (GridLineItem). It has 3 case• row_coll is nothing (new page)• row_coll.count <= 0 (data in collection is

empty)• row_coll.count > 0 (have data in collection

Note: fist 2 case will set blank data into Datatable

In Page_Load, Button add event onclick to call function OpenListofValue in javascript and pass name of table in parameter.

Function OpenListofValue (javascript) popup form frmListofValue.aspx.

Function MyInitializeListOfValue in frmListofValue.aspx.vb check case and set query string, data field, and header.

After select data in List of Value, Function GetFromListOfValue (javascript) will pass selected value to caller (Default.aspx).

Function GetFromListOfValue (javascript in Default.aspx) pass value to textbox txtPassLookupValues.

Finally, Function txtPassLookupValues_TextChanged will process data.