added when-not-to-use-blank-lines

content/docs/BestPractices/blank-lines-when-not-to-use/index.md

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+---
+title: "When not to use Blank Lines"
+tags: ["AL","Readability"]
+categories: ["Best Practice"]
+---
+
+Do not use blank lines:
+
+- at the beginning or end of any functions (after `begin` and before `end`)
+- inside multiline expressions
+
+## #1 Example
+
+### Bad code
+
+```al
+procedure MATRIX_OnDrillDown(MATRIX_ColumnOrdinal: Integer);
+begin
+
+    SetupDrillDownCol(MATRIX_ColumnOrdinal);
+    DrillDown(false, ValueType);
+
+end;
+```
+
+### Good code
+
+```al
+procedure MATRIX_OnDrillDown(MATRIX_ColumnOrdinal: Integer);
+begin
+    SetupDrillDownCol(MATRIX_ColumnOrdinal);
+    DrillDown(false, ValueType);
+end;
+```
+
+## #2 Example
+
+### Bad code
+
+```al
+if NameIsValid and
+
+    Name2IsValid
+then
+```
+
+### Good code
+
+```al
+if NameIsValid and
+    Name2IsValid
+then
+```