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// loading bytes from a file is very easy in C#. The built in System.IO.File.ReadAll* methods take care of making sure every byte is read properly. c# pdf viewer NuGet Gallery | Spire. PDFViewer 4.5.1
NET PDF Viewer component. With Spire. PDFViewer , developers can create any WinForms application to open, view and print PDF document in C# and Visual ... The same defensive programming techniques that I advocate for building truly portable database applications are, in essence the same as those employed by people writing OS-portable applications. The goal is to fully utilize the facilities available to you, but ensure you can change the implementation on a case-by-case basis. As an analogy, Oracle is a portable application. It runs on many operating systems. However, on Windows it runs in the Windows way: using threads and other Windows-specific facilities. On UNIX, Oracle runs as a multiprocess server, using individual processes to do what threads did on Windows that is the UNIX way. The core Oracle functionality is available on both platforms, but it is implemented in very different ways under the covers. Your database applications that must function on multiple databases will be the same. For example, a common function of many database applications is the generation of a unique key for each row. When you insert the row, the system should automatically generate a key for you. Oracle has implemented the database object called a SEQUENCE for this. Informix has a SERIAL datatype. Sybase and SQL Server have an IDENTITY type. Each database has a way to do this. However, the methods are different, both in how you do it and the possible outcomes. So, for the knowledgeable developer, there are two paths that can be pursued: Develop a totally database-independent method of generating a unique key. Accommodate the different implementations and use different techniques when implementing keys in each database. c# wpf document viewer pdf: Save RDLC Report as PDF at Run Time in C# - C# Corner view pdf in windows form c# How to Open PDF Files in Web Brower Using ASP . NET - C# Corner
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Find out most popular NuGet pdf Packages. ... NET applications to read, write and manipulate existing PDF documents without using Adobe Acrobat. It also allows you to create ... As such, you'll find it documented for C# and VB.NET, with ... The theoretical advantage of the first approach is that to move from database to database you need not change anything. I call it a theoretical advantage because the downside of this implementation is so huge that it makes this solution totally infeasible. What you would have to do to develop a totally database-independent process is to create a table such as ops$tkyte@ORA10G> create table id_table 2 ( id_name varchar2(30) primary key, 3 id_value number ); Table created. ops$tkyte@ORA10G> insert into id_table values ( 'MY_KEY', 0 ); 1 row created. ops$tkyte@ORA10G> commit; Commit complete. Then, in order to get a new key, you would have to execute the following code: ops$tkyte@ORA10G> update id_table 2 set id_value = id_value+1 3 where id_name = 'MY_KEY'; 1 row updated. ops$tkyte@ORA10G> select id_value 2 from id_table 3 where id_name = 'MY_KEY'; ID_VALUE ---------1 Looks simple enough, but the outcomes (notice plural) are as follows: Only one user at a time may process a transaction row. You need to update that row to increment a counter, and this will cause your program to serialize on that operation. At best, one person at a time will generate a new value for this key. In Oracle (and the behavior might be different in other databases), all but the first user to attempt to concurrently perform this operation would receive the error ORA-08177: can t serialize access for this transaction in the SERIALIZABLE isolation level. For example, using a serializable transaction (which is more common in the J2EE environment, where many tools automatically use this as the default mode of isolation, often unbeknownst to the developers), you would observe the following behavior. Notice that the SQL prompt (using the SET SQLPROMPT SQL*Plus command) contains information about which session is active in this example: open pdf file in c# windows application Embedding Adobe Reader into a WPF Application - Edraw
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in C# System.Diagnostics.Process.Start(path); in managed C++. System:: Diagnostics::Process::Start(path);. Summary C.2.8 Entity lifecycle annotations The annotations in this section are used for entity lifecycle management. The following example shows how you might use the DBMS_CRYPTO built-in package in Oracle 10g to compute these hashes/checksums. The technique would also be applicable for the other two listed packages; the logic would not be very much different, but the APIs you call would be. Here we query out the information for department 10 to be displayed in some application. Immediately after querying the information, we compute the hash using the DBMS_CRYPTO package. This is the version information that we retain in our application: ops$tkyte@ORA10G> begin 2 for x in ( select deptno, dname, loc 3 from dept 4 where deptno = 10 ) 5 loop 6 dbms_output.put_line( 'Dname: ' || x.dname ); 7 dbms_output.put_line( 'Loc: ' || x.loc ); 8 dbms_output.put_line( 'Hash: ' || 9 dbms_crypto.hash 10 ( utl_raw.cast_to_raw(x.deptno||'/'||x.dname||'/'||x.loc), 11 dbms_crypto.hash_sh1 ) ); 12 end loop; 13 end; 14 / Dname: ACCOUNTING Loc: NEW YORK Hash: C44F7052661CE945D385D5C3F911E70FA99407A6 PL/SQL procedure successfully completed. As you can see, the hash is just a big string of hex digits. The return value from DBMS_CRYPTO is a RAW variable, and when displayed it will be implicitly converted into HEX for us. This is the value we would want to use before updating. To update that row, we would retrieve and lock the row in the database as it exists right now, and then compute the hash value of that retrieved row and compare this new hash value with the hash value we computed when we read the data out of the database. The logic for doing so could look like the following (in real life, we would use bind variables for the literal hash values, of course): open pdf file in iframe in asp.net c# how to show pdf inside the aspx page? - Stack Overflow
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