I want to read data from a DWG excel file using C sharp

example code:

[CommandMethod("Test")]
public static void TestMethod()
{
    Document doc = Application.DocumentManager.MdiActiveDocument;
    Editor ed = doc.Editor;
    Database db = doc.Database;

    using (Transaction Tx = db.TransactionManager.StartTransaction())
    {
        BlockTableRecord bt = Tx.GetObject(db.CurrentSpaceId, OpenMode.ForRead) as BlockTableRecord;

        foreach (ObjectId id in bt)
        {
            if (id.ObjectClass.Name != "AcDbOle2Frame")
                continue;

            Ole2Frame oleFrame = Tx.GetObject(id, OpenMode.ForRead) as Ole2Frame;

            if (! oleFrame.IsLinked)
            {
                Microsoft.Office.Interop.Excel.Workbook wb = oleFrame.OleObject as Microsoft.Office.Interop.Excel.Workbook;

                Microsoft.Office.Interop.Excel.Worksheet ws = wb.ActiveSheet;

                Microsoft.Office.Interop.Excel.Range range = ws.UsedRange;
                for (int row = 1; row <= 15; row++)
                {
                    for (int col = 1; col <= range.Columns.Count; col++)
                    {
                        ed.WriteMessage(String.Format("{0}{1}{2}-{3}", Environment.NewLine, row, col, Convert.ToString((range.Cells[row, col] as Microsoft.Office.Interop.Excel.Range).Value2)));
                    }
                }
            }
        }
    }

1-autocad program will be closed
2-be selected within the file path c sharp example: csharp.jpg
3-I want to read data from a DWG excel file using C#. examples: dwgfile.jpg and drawing1.dwg
4-I want to list here DataGridView data
5-c sharp winform .net 4.0
Can you help me?