1. Debugging Visual Basic Programs
Sarah Bin shalan

2. Quick Reference Do This To
On the View menu, point to Toolbars, and then click Debug.
Display the Debug toolbar
In the Code Editor, click in the Margin Indicator bar next to the statement where you want to stop program execution. When the compiler reaches the breakpoint, it will enter debugging mode. or
Place a Stop statement in the program code where you want to enter debugging mode.
Set a breakpoint
Click the Step Into button on the Standard toolbar.
Execute one line of code in the Code Editor
In debugging mode, select the value in the Code Editor, and then
hold the pointer over it.
Examine a variable,
a property, or an expression
in the Code Editor
In debugging mode, click the Debug menu, point to Windows, and
then click Autos.
Use the Autos window to
examine a variable on the
current or previous line
In debugging mode, select the value in the Code Editor, right-click
the value, and then click Add Watch.
Add a variable, a property,
or an expression to a Watch
window

3. Quick Reference Do This To
In debugging mode, click the Debug menu, point to Windows,
point to Watch, and then click the window.
Display a Watch window
Click the Debug menu, point to Windows, and then click
Immediate.
Open the Immediate
window
Click the breakpoint in the Margin Indicator bar of the Code Editor. or
Click the Delete All Breakpoints command on the Debug menu.
Remove one or more
breakpoints
Click the Stop Debugging button on the Standard toolbar.
Stop debugging

4. Reference
M.Halvorson, Visual basic 2010 step by step.