Visual Basic allows a procedure to be repeated as many times as long as the processor could support. This is generally called  looping .
 

9.1  Do Loop

The format are

a)   Do While condition

            Block of one or more VB statements

      Loop

b)   Do
            Block of one or more VB statements
      Loop While condition

c)    Do Until condition
              Block of one or more VB statements
       Loop

d)    Do
             Block of one or more VB statements

       Loop Until condition

Example 9.1

       Do while counter <=1000

             num.Text=counter

             counter =counter+1

       Loop

* The above example will keep on adding until counter >1000.

The above example can be rewritten as

        Do

               num.Text=counter
               counter=counter+1

       Loop until counter>1000
 

9.2  For....Next Loop

The format is:
 

For counter=startNumber to endNumber (Step increment)

    One or more VB statements

Next
 

Example:

(a)       For  counter=1 to 10

             display.Text=counter
 
           Next

(b)      For counter=1 to 1000 step 10

           counter=counter+1
 
           Next

(c)       For counter=1000 to 5 step -5

          counter=counter-10

           Next