using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Autodesk.AutoCAD.Interop;
using Autodesk.AutoCAD.Interop.Common;
using System.Data.OleDb;
private void button3_Click(object sender, EventArgs e)
{
string a="New图层";
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Autodesk.AutoCAD.Interop;
using Autodesk.AutoCAD.Interop.Common;
using System.Data.OleDb;
private void button3_Click(object sender, EventArgs e)
{
string a="New图层";