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Code39 Barcodes in VB . NET and C# - CodeProject
24 Sep 2015 ... The article will illustrate how to create a Code39 barcode in VB . NET and C#.

In the previous example, you saw how to take one of the complex queries you learned about in 8 and turn it into a make-table query In truth, if you plan to collect such data over several months or years, you should probably design a table to hold the results and use append queries to periodically insert new historical data Another good use of append queries is to copy old transaction data to an archive table either in the current database or another database For example, after several months or years, the contact events table in the LawTrack Contacts application might contain thousands of rows You might want to keep all events, but copying them to an archive table and deleting them from the main table can improve application performance (You ll learn about delete queries later in this chapter. generate code 39 barcode

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Code 39 VB . NET barcode generator control, provided by, is an advanced developer-library. It aims to help you easily and simply create & print Code 39 , which is also known as USS Code 39 , Code 3/9, Code 3 of 9 , USD-3, Alpha39, or Type 39 , in your VB . NET applications.

) Let s build an append query to select old contact events and copy them to an archive table Open the ContactsDataCopymdb database to follow along in this exercise You ll find an empty tblContactEventsHistory table defined in this database Start a new query on tblContactEvents Because the ContactEventTypeID field is a lookup to tlkpContactEventTypes, it would be a good idea to preserve the original description of the event rather than the code number If you kept the original ContactEventTypeID, any changes you made in the future to the related ContactEventDescription would also change the meaning in the archived records So, add the tblkpContactEventTypes table so that you can store the current description rather than the ID in the history table You should see a join line linking the ContactEventTypeID fields in the two tables Add the fields ContactID and ContactDateTime from tblContactEvents to the query design grid.

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Include in the grid the ContactEventTypeDescription field from tlkpContactEventTypes Finally, add to the query design grid the ContactNotes field from tblContactEvents Because you are saving events in a history table, you don t need the ContactFollowUp and ContactFollowUpDate fields from tblContactEvents You want to be able to filter the records on the date and time of the event Each time you run this query, you probably don t want to archive any recent events, so you need to create a prompt to select events that are a specified number of months old A couple of handy date/ time functions are available for you to do this: DateSerial and DateAdd DateSerial returns a date value from a year, month, and day input You can use it to calculate the first date of the current month like this:.

Private Sub GetData() Dim r As Long If IsNumeric(RowNumber.Text) Then r = CLng(RowNumber.Text)

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Code39 Barcodes in VB.NET and C# - CodeProject
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Remember from Table 7-5, page 244, that the Date function returns today s date, the Year function returns the four-digit year value from a date value, and the Month function returns the month number from a date value. Supplying the value 1 for the day number gets you the date of the first day of the current month. 353

Else ClearData MsgBox "Illegal row number" Exit Sub End If If r > 1 And r <= LastRow Then CustomerId.Text = FormatNumber(Cells(r, 1), 0) CustomerName.Text = Cells(r, 2) City.Text = Cells(r, 3) State.Text = Cells(r, 4) Zip.Text = Cells(r, 5) DateAdded.Text = FormatDateTime(Cells(r, 6), vbShortDate) DisableSave ElseIf r = 1 Then ClearData Else ClearData MsgBox "Invalid row number" End If End Sub




Knowing that RowNumber contains a numeric value, the CLng function is used to convert the value in RowNumber into the variable r. The rest of the code merely uses r to extract the information from the proper row and copy it to the correct field. Otherwise, a message box will be displayed to the user indicating that the row number value is invalid. The ClearData routine simply assigns an empty string to each field on the form to clear out any values that might have already been displayed on the form. (Remember that the ComboBox control can t be set to an empty string and should be set to a valid state value.)



Private Sub ClearData() CustomerId.Text = "" CustomerName.Text = "" City.Text = "" State.Text = "AK" Zip.Text = "" DateAdded.Text = "" End Sub

Microsoft Office Access 2003 Inside Out Tip You can usually think of more than one way to calculate a date value that you want. To generate code 39 barcode

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Code 39, also named 3 of 9 Code, USD-3, Alpha39, Code 3/9, Type 39 & USS Code39, is a self-checking linear barcode symbology specified in ISO/IEC symbology specification to encode alphanumeric data. It is simple to generate Code 39 barcode images in ASP.NET using VB class with this advanced barcode generator library.

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