Generally you are to place only one statement per line and use only one line of
code per statement. Sometimes the entire statement will not fit on one line. To
continue a statement to the next line we must use the continuation operator -
the underscore ( _ ). A space must precede the continuation operator.
When using the continuation symbol use it with purpose. Break your statement into logical pieces and indent subsequent lines.
lblTotalDue.Text = "Amount of sale
= " & decPurchaseAmt _
& ", Tax due = " & "Total amount Due = " & decAmtDue & "."