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Figure 5.2. The form-level collection object. in .NET Develop PDF 417 in .NET Figure 5.2. The form-level collection object.




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Figure 5.2. The form-level collection object. using barcode creation for visual studio .net control to generate, create barcode pdf417 image in visual studio .net applications. Microsoft Windows Official Website Data Insertion with Visual Basic.NET cmdInsert A B C Click Private Sub cmdInse rt_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdInsert.

Click Dim strCheck As KeyValuePair(Of String, String) Call CreateFacultyCollection() For Each strCheck In FacultyCollection If strCheck.Value = String.Empty Then MessageBox.

Show(strCheck.Key &" is empty, continue ") RemoveFacultyCollection() Exit Sub End If Next strCheck If chkPhoto.Checked = True And (txtPhotoName.

Text = "" Or txtPhotoLocation.Text = "") Then MessageBox.Show("Photo Name/Photo Location is empty") End If End Sub.

Figure 5.3. The coding for the Insert button event procedure. text box. Then the user clicks the Insert button to perform this data insertion. The time to add all text boxes into the collection object is after the user has nished entering all information into the text boxes, not before.

Also, each time you nish data validation by checking all text boxes, all the text boxes should be removed from that collection since the collection only allows those text boxes to be added once. Another point to be noted is that in order to simplify this data validation, in this application we need all text boxes to be lled with speci c information, or NULL needs to be entered if no information will be entered. In other words, we don t allow any text boxes to be empty.

The data insertion will not be performed until all text boxes are nonempty in this application. Based on these descriptions, we need to create two user-de ned subroutines to perform the adding and removing of text boxes from the collection object. Open the GUI window of the Insert Faculty form by clicking the View Designer button in the Solution Explorer window, and then double-click the Insert button to open its event procedure.

Enter the code that is shown in Figure 5.3 into this event procedure. Let s take a look at this coding to see how it works.

A. First, we need to create an instance of the KeyValuePair structure, and this structure instance contains two arguments, the Key and the Value, which are related to a collection component. In step B, both a key and the content of the associated text box are added to the collection FacultyCollection when the subroutine CreateFacultyCollection() is called.

We need both the key and the value of a text box to validate the data for each text box; to check whether a text box is empty, the value of that text box is used, and to identify the emptied text box, the key of the text box is used. B. Next, we need to call the subroutine CreateFacultyCollection() to add all text boxes into the collection FacultyCollection.

Refer to Figure 5.4 for the coding of this subroutine. C.

The For Each . . .

Next loop is utilized to scan all text boxes to check and identify any text box whose content is empty in the FacultyCollection. If. 5.2 Insert Data into the Access Database Using a Sample Project InsertWizard InsertFacultyForm Private Sub CreateFacultyCollection(). CreateFacultyCollection FacultyCollection.Add("Fac ulty ID", txtID.Text) FacultyCollection.

Add("Faculty Name", txtName.Text) FacultyCollection.Add("Faculty Title", txtTitle.

Text) FacultyCollection.Add("Faculty Office", txtOffice.Text) FacultyCollection.

Add("Faculty Phone", txtPhone.Text) FacultyCollection.Add("Faculty College", txtCollege.

Text) FacultyCollection.Add("Faculty Email", txtEmail.Text) End Sub.

Figure 5.4. The coding for the subroutine CreateFacultyCollection. any text box is empty, tha t text box will be identi ed by its key, and a message box is used to ask the user to ll some information in it. Then the subroutine RemoveFacultyCollection() is called to remove all text boxes that have been added to the collection in the subroutine CreateFacultyCollection() since the collection only allows those text boxes to be added once. The program will exit if this situation happens.

The coding for the subroutine RemoveFacultyCollection() is shown in Figure 5.5. D.

If the Checked property of the chkPhoto is True, which means that the user selected the Faculty Photo check box and wants to include a faculty photo for this data insertion, we need to check whether the text box containing the photo name or the text box containing the photo location is empty. A message box will be shown to remind the user to enter the photo name and the photo location if either of them is empty. Now let s take care of the coding for the subroutine CreateFacultyCollection(), which is shown in Figure 5.

4. The coding is very simple and straightforward. Each text box is added to the collection by using the Add() method with two parameters: the rst one is the socalled Key parameter represented in a string format, and the second is the content of each text box, which is considered the Value parameter.

In this way, each text box can be identi ed by its key. Of course each text box can also be identi ed by the index, but remember that the index starts from 0, not 1, since it is a .NET Framework collection instead of a Visual Basic collection.

. InsertFacultyForm PrivateS pdf417 2d barcode for .NET ub RemoveFacultyCollection() FacultyCollection.Remove("Faculty ID") FacultyCollection.

Remove("Faculty Name") FacultyCollection.Remove("Faculty Title") FacultyCollection.Remove("Faculty Office") FacultyCollection.

Remove("Faculty Phone") FacultyCollection.Remove("Faculty College") FacultyCollection.Remove("Faculty Email") End Sub.

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