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Common Code
for Tools
Load an Image Into a Picture Box
Picturebox1.image = system.drawing.image.fromfile _ ("c:\folder\file.jpg")
Note the underscore.
The underscore is a continuation character. It says this is not
the end of the statement, and that it will continue on the next line.
Prompt for Input
InputName=InputBox("Enter your name
please")
Check For a Checked Checkbox
Values
for checkbox states:
1 =
checked
0 = not
checked
How you
can evaluate the state:
If
checkbox1.checkstate = 1 Then
Add Items to a List Box
ListBox1.Items.Add("Cash")
ListBox1.Items.Add("Check")
ListBox1.Items.Add("Credit")
Add Items to a Combo Box
ComboBox1.Items.Add("Cash")
ComboBox1.Items.Add("Check")
ComboBox1.Items.Add("Credit")
Add radio buttons
Use the GroupBox control to encapsulate a set of
radio buttons.
Evaluate a list box selection and act on it
Select Case
ListBox1.SelectedIndex
Case 0
Payment = "Cash"
Case 1
Payment = "Check"
Case 2
Payment = "Credit"
End Select
Evaluate a combobox selection and act on it
Select Case
ComboBox1.SelectedIndex
Case 0
Payment = "Cash"
Case 1
Payment = "Check"
Case 2
Payment = "Credit"
End Select
If Then Else
If CheckBox1.CheckState = 1 Then
PictureBox2.Visible = True
Else
'If there is no mark, hide the image
PictureBox2.Visible = False
End If
Note the comment.
It is preceded by a single quote mark. Use these to make notes in
your code so you can understand it later.
Events
Statements to run when a things happen
Private Sub Form1_Load(ByVal sender As System.Object)
These statements define the event, in this case
Form1 Load. Statements about what to do when the event occurs will follow.
Typically list boxes are filled when the form
loads.
Methods
Statements that can do something to a particular
kind of object.
The Add method
Used to Add items to a list or combo box
ComboBox1.Items.Add("U.S. Dollars")
Process start
Use this to starts a browser or another
application from the VB program.
Starts the browers with a url loaded
System.Diagnostics.Process.Start _
("http://www.microsoft.com/learning/books/")
Starts Word with a document loaded
System.Diagnostics.Process.Start _ ("winword.exe”,c:\myletter.doc")
Loose Notes
Continuation character is the underscore - use
this to continue a statement on the next line.
Single quote starts a comment
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