.NET/Java PDF, Tiff, Barcode SDK Library

we re speaking of, as it requires binding to the entire result set on every postback, and then just whittles down the visible rows to the selected page. (However, default paging can work alright with a cached DataSet, as we show in a bit). With custom paging, you can have the database return a single page of data at a time, and display only that page to the user. This saves on the network traffic between the database server and the web server, minimizes the size of the DataSet, and reduces the DataGrid s consumption of resources for its DataGridItem collection, the rendered HTML, and the ViewState. (In 11 we ll take a look at the new Data Source Controls and the Web Controls that bind to them [like the GridView], and examine their behavior and interaction with ViewState across postbacks.) And finally, if there s high contention for a single resource, get it out of the database at once and programmatically put it into the Cache. This significantly reduces the footprint, because all users will now share a single copy of the DataSet. The DataSet can still be filtered in-memory if different users require seeing different subsets of the data. Put the superset into the memory, and then filter it down on a per-user or per- page basis. You should also test this strategy by putting it under load, given in-memory filtering of the DataSet doesn t perform as well as querying the database, even when you factor in the network round-trip. This is especially true for large result sets (DataTables with more than 50,000 rows). (See 11 for details on the new Cache dependency types, which allow the Cache to automatically purge entries as changes are made to the database data.)

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getRow() ); We then go to the first row and print out a boolean indicating if it is the first row: rsetfirst(); // go to the first row Systemoutprintln( "Is it the first row : " + rsetisFirst()); Next, we go to the row number 4 and print out our current position: rsetabsolute( 4 ); // go to the row number 4 Systemoutprintln( "current position: " + rsetgetRow() ); We then move three rows forward, print the current position, move two rows backward, and print the current position: rsetrelative( +3 ); // go to the next 3 rows from current row Systemoutprintln( "current position: " + rsetgetRow() ); rsetrelative( -2 ); // go to the previous 2 rows from current row Systemoutprintln( "current position: " + rset.

We first cover what happens when structured data gets marshalled by the CLR in the case of nontrivial argument types. Here we show the SumC function responsible for adding two complex numbers defined by the Complex C data structure: typedef struct _Complex { double re; double im; } Complex; Complex CINTEROPDLL_API SumC(Complex c1, Complex c2) { Complex ret; ret.re = c1.re + c2.re; ret.im = c1.im + c2.im; return ret; } To invoke this function from F#, you must define a data structure in F# corresponding to the Complex C structure. If the memory layout of an instance of the F# structure is the same as that of the corresponding C structure, then values can be shared between the two languages. But how can you control the memory layout of a managed data structure Fortunately, the PInvoke specification helps with custom attributes that allow specifying memory layout of data structures. The StructLayout custom attribute consents to indicate the strategy adopted by the runtime to lay out fields of the data structure. By default, the runtime adopts its own strategy in the attempt to optimize the size of the structure, keeping fields aligned to the machine world in order to ensure fast access to the fields of the structure. The C standard ensures that fields are laid out in memory sequentially in the order they appear in the structure definition; other languages may use different strategies. Using an appropriate argument, you can indicate that a C-like sequential layout strategy should be adopted. Moreover, it is also possible to provide an explicit layout for the structure indicating the offset in memory for each field of the structure. For this example, here we use the sequential layout for the Complex value type:

getRow() ); Next, we move to the row before the first row and move to the first row by executing the next() method We print the current position: rsetbeforeFirst( ); // go to the position before the first row rsetnext(); // now go to first row Systemoutprintln( "current position: " + rsetgetRow() ); Finally, we move to the row after the last row and move to the last row by executing the previous() method We print the current position: rsetafterLast( ); // go to the position after the last row rsetprevious(); // now go to last row Systemoutprintln( "current position: " + rsetgetRow() );.

The Page object renders and sends the generated HTML down the IIS output stream. However, the rendering behavior is publicly exposed, and that stream can be captured and sent to other output formats. This may be useful if you re pregenerating a website: You can render all permutations and combinations of the output of the site and write them to disk or send them to the database. You can have specialized pages that dynamically generate output once, and then store it in a static ASCX file for use as a User Control on another page.