/// <summary>/// 附加數據庫/// </summary>/// <returns></returns>private bool Attachdb(){ try {   string sql = string.Empty;  if (File.Exists(sMDBFile))  {   sql = "EXEC sp_attach_db @dbname = '" + txtDBName.Text +      "', @filename1 = '" + sMDBFile+     "',@filename2='" + sLog + "'";   SqlConnection conn = new SqlConnection(string.Format("Data Source={0};Initial Catalog=master;User ID={1};PWD={2}","(local)","sa","pwd"));   using (conn)   {    lock (conn)    {     conn.Open();     SqlCommand cmd = new SqlCommand(sql, conn);     cmd.ExecuteNonQuery();    }   }  }  return true; } catch {  return false; }}//sMDBFile 為mdf文件路徑//sLog 為ldf文件路徑