Introduction to VBprogramming
Dr. John P. Abraham
UTPA
Chapters 2 & 3
Continued from last week’s demo
•Difference between label and text boxes
•Properties window
–Changing name and text
–Border Style
–AutoSize
–BackColor
–Font Size
–Visible
–TabIndex
Solution Explorer
•Show all files
Visual Basic Controls
•Choose Windows forms application
•What you see is the IDE (IntegratedDevelopment Environment)
•Use Sizing handle to make the form
•Adjust the size of the properties window
•Tac the toolbox
–Use common controls
•Start placing objects on the form
•Place a button, label it Exit and add codeme.close()
Applications
•Console
–Output appears in console window
–From Visual studio choose VB and choose anew project, and choose Console Application,Give it a name.
–Follow Chapter 3.
•Window
Demo of Hello program
Dim name As String
Console.Write("Please Enter yourName > ")
name = Console.ReadLine()
Console.Write("Hello " & name & "!")
Console.ReadLine()
Adding a pop-up message box
Add a form to the application
Add this line
MessageBox.Show("Hello " & name & "!","Show Message")
Discuss Assignment that wasturned in
•Explain input
–Public Class FrmBreak1
– Dim num As Integer
– Private Sub Button1_Click(ByVal sender AsSystem.Object, ByVal e As System.EventArgs)Handles btnReadNum.Click
– num = InputBox("Enter a Number", "ReadNumber")
– lblNumber.Text = num
– End Sub
–End Class
Program submission
•Program print out
•Program Run
•Place them in a manila folder
Writing to sequential file – For Future Submissions
Imports System.IO
Public Class SeqFileWrite
Dim fileName As String
Dim fileWriter As StreamWriter
Dim output As FileStream
Private Sub btnFileSave_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles btnFileSave.Click
fileName = txtFileName.Text
output = New FileStream(fileName, FileMode.Create,FileAccess.Write)
fileWriter = New StreamWriter(output)
fileWriter.WriteLine("Hello World")
fileWriter.WriteLine("My Name is: John Abraham, Now thisworks.")
fileWriter.Close()
End Sub
End Class