what is the use of defining a variable on a method inside a square brackets in VB.net? -


i looking @ method in vb.net , quite knew vb.net. trying understand why integer "[to]" , "[step] "is defined in square brackets ? can 1 please explain me. why can these defined to/step. have attached code below. in advance.

   ''' <summary>     ''' write runtime output loop information     ''' expected use when loop counter incremented     ''' </summary>     public sub writetoruntimeoutput(counter integer, [to] integer, [step] integer)          dim message new stringbuilder         message.appendformat("loop counter incremented. loop {0}/{1}", counter, [to])         if loopstep <> 1             message.appendformat(" step {0}", [step])         end if         message.append(".")         return message.tostring()     end sub

square brackets used create variable has same name keyword.

for example

dim [integer] integer


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