strConnection连接Access数据库

string strConnection = "Provider=Microsoft.ACE.OLEDB.12.0;";
            strConnection += @"Data Source=D:\database\material.accdb";
            //建立数据库连接
            OleDbConnection conn = new OleDbConnection(strConnection);
            //打开连接  
            conn.Open();
            string Access = "select * from CUSTMATERIAL1";
            OleDbCommand cmd = new OleDbCommand(Access, conn);
            OleDbDataAdapter adapter = new OleDbDataAdapter(Access, conn);
            //建立数据集
            DataSet myds = new DataSet();
            adapter.Fill(myds,"CUSTMATERIAL1");
            dataGridView1.DataSource = myds.Tables[0];