# System.Windows.Forms.Design.Behavior

``` diff
 namespace System.Windows.Forms.Design.Behavior {
     public sealed class SnapLine {
-        public SnapLine(SnapLineType type, int offset, string filter);
+        public SnapLine(SnapLineType type, int offset, string? filter);
-        public SnapLine(SnapLineType type, int offset, string filter, SnapLinePriority priority);
+        public SnapLine(SnapLineType type, int offset, string? filter, SnapLinePriority priority);
-        public string Filter { get; }
+        public string? Filter { get; }
     }
 }
```

