- namespace TryChangeTableBorders 
- { 
-   using Autodesk.AutoCAD.Colors; 
-   using Autodesk.AutoCAD.DatabaseServices; 
-   using Autodesk.AutoCAD.EditorInput; 
-   using Autodesk.AutoCAD.Runtime; 
-   using AcApp = Autodesk.AutoCAD.ApplicationServices.Core.Application; 
-   
-   public static class TestCommand 
-   { 
-     [CommandMethod("ChangeTableBorders")] 
-     public static void Start() 
-     { 
-       var doc = AcApp.DocumentManager.MdiActiveDocument; 
-       var ed = doc.Editor; 
-   
-       var result = ed.GetEntity(new PromptEntityOptions("\nPick table")); 
-   
-       using (var tr = doc.TransactionManager.StartTransaction()) 
-       { 
-         if (tr.GetObject(result.ObjectId, OpenMode.ForWrite) is Table table) 
-         { 
-           foreach (var range in table.Cells) 
-           { 
-             var cell = table.Cells[range.Row, range.Column]; 
-             ChangeCellRangeBorders(cell.IsMerged == true ? cell.GetMergeRange() : cell); 
-           } 
-           table.GenerateLayout(); 
-           table.RecomputeTableBlock(true); 
-         } 
-         tr.Commit(); 
-       } 
-     } 
-   
-     private static void ChangeCellRangeBorders(CellRange cell) 
-     { 
-       LineWeight? lwtop = cell.Borders.Top.LineWeight; 
-       LineWeight? lwbottom = cell.Borders.Bottom.LineWeight; 
-       LineWeight? lwleft = cell.Borders.Left.LineWeight; 
-       LineWeight? lwright = cell.Borders.Right.LineWeight; 
-   
-       if (lwtop == LineWeight.LineWeight040) 
-       { 
-         cell.Borders.Top.LineWeight = LineWeight.LineWeight200; 
-         cell.Borders.Top.Color = Color.FromColorIndex(ColorMethod.ByColor, 1); 
-       } 
-   
-       if (lwleft == LineWeight.LineWeight040) 
-       { 
-         cell.Borders.Left.LineWeight = LineWeight.LineWeight200; 
-         cell.Borders.Left.Color = Color.FromColorIndex(ColorMethod.ByColor, 2); 
-       } 
-   
-       if (lwright == LineWeight.LineWeight040) 
-       { 
-         cell.Borders.Right.LineWeight = LineWeight.LineWeight200; 
-         cell.Borders.Right.Color = Color.FromColorIndex(ColorMethod.ByColor, 3); 
-       } 
-   
-       if (lwbottom == LineWeight.LineWeight040) 
-       { 
-         cell.Borders.Bottom.LineWeight = LineWeight.LineWeight200; 
-         cell.Borders.Bottom.Color = Color.FromColorIndex(ColorMethod.ByColor, 4); 
-       } 
-     } 
-   } 
- }