read pdf in asp.net c#

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Read or load a PDF file and extract its text content in C# and VB. NET application with GemBox.Document library.

The only SQL command used to query database data is SELECT. This command acts at the set (or table) level, and always produces a set (or table) as its result. If a certain query returns exactly one row, or no rows at all, the result is still a set: a table with one row or the empty table, respectively. The SELECT command (as defined in the ANSI/ISO SQL standard) has six main components, which implement all SQL retrieval. Figure 2-1 shows a diagram with these six main components of the SELECT command.

read pdf file in asp.net c#

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how to read pdf file in asp.net using c#

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The preceding section was concerned with using streams to perform synchronous I/O operations, in which a call to a read or write method blocks until the operation completes. This section discusses the .NET support for asynchronous I/O, which allows read and write operations to be performed without blocking. Version 1.4 of the Java platform includes support for asynchronous, or nonblocking, I/O, but the .NET model differs so much that we see little benefit in providing a comparison. Asynchronous I/O is byte-oriented, not character-oriented. All classes derived from System.IO.Stream can be used in asynchronous I/O. Importantly, none of the reader and writer classes detailed in the preceding section can be used. To demonstrate asynchronous I/O, we'll concentrate on using the FileStream class. Since all streams can be used for asynchronous I/O, the model laid out in this section can be applied to any of the stream classes. At the heart of all asynchronous operations is the System.AsyncCallback delegate, which will be invoked when an asynchronous operation has completed. The signature for this delegate is a method that accepts an instance of System.IAsyncResult and returns void. The following example demonstrates reading an English transcript of the Magna Carta using asynchronous calls:

I ll start with some fundamentals of local temporary tables before showing examples, and I ll do the same whenever discussing a new temporary object type . When referring to temporary tables in this section, assume that the discussion pertains to local ones . You create and manipulate a temporary table just as you would a permanent one, for the most part . I ll point out the aspects of temporary tables that are different from permanent ones, or aspects that are often misunderstood .

You can use these namespaces in your queries without defining them again . You define your own data types in the prolog, which belongs at the beginning of your XQuery . You separate the prolog from the query body with a semicolon . In addition, in T-SQL, you can declare namespaces used in XQuery expressions in advance in the WITH clause of the T-SQL SELECT command . If your XML uses a single namespace, you can also declare it as the default namespace for all elements in the XQuery prolog . You can also include comments in your XQuery expressions . The syntax for a comment is text between parentheses and colons: (: this is a comment :) . Do not mix this with comment nodes in your XML document; this is the comment of your XQuery, and has no influence on the XML returned . The following code shows all three methods of namespace declaration and uses XQuery comments . It extracts orders for the first customer from an XML instance . I created this XML instance with a SELECT statement similar to the one I used in the FOR XML AUTO section earlier in the chapter .

As proof, run the following code that shows which temporary tables currently exist in tempdb by querying metadata info, creating a table variable, and querying metadata info again:

read pdf file in asp.net c#

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read pdf in asp.net c#

how to read pdf file in asp.net using c#

how to read pdf file in asp.net using c#

how to read pdf file in asp.net using c#

how to read pdf file in asp.net c#

asp.net c# read pdf file

asp.net c# read pdf file

how to read pdf file in asp.net c#