ASP.NET PDF Viewer using C#, VB/NET

You instantiate an OracleConnectionCacheImpl instance and set its connection properties in one of three ways: Use the OracleConnectionCacheImpl constructor, which takes an existing connection pool data source as input: OracleConnectionCacheImpl occi = new OracleConnectionCacheImpl(cpds); Use the setConnectionPoolDataSource() method on an existing OracleConnection CacheImpl instance, which takes a connection pool data source instance as input: OracleConnectionCacheImpl occi = new OracleConnectionCacheImpl(); occi.setConnectionPoolDataSource(cpds);

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Note that >> is typically applied to only two arguments those on either side of the binary operator, here named f and g. The final argument x is typically supplied at a later point. F# is good at optimizing basic constructions of pipelines and composition sequences from functions for example, the function countLinks shown earlier will become a single function calling the three functions in the pipeline in sequence. This means sequences of compositions can be used with relatively low overhead.

Figure 4-4. The test page after a postback Now let s turn ViewState on and rerun the tests. The page looks the same on the first request. Notice now that some bytes are being consumed by the control in ViewState (see Figure 4-5). Now when you enter a value and do a postback, the back color of the TextBox is maintained, in addition to the field value. The field value is still maintained using information in the HTTP Post, whereas you ve used ViewState to maintain the CSS value. Web Control properties that render as an inline CSS Style attribute in the resulting HTML are but one example of control state information that must be tracked in ViewState. The collection of list items for a list control is another good example, as you saw earlier. Since the only piece of information about a list that automatically gets sent to the server when a post occurs is the value of the control; anything else that needs to be tracked across postbacks must be put into ViewState.

Use the default OracleConnectionCacheImpl constructor and set the properties using the setter methods inherited from the OracleDataSource class: OracleConnectionCacheImpl occi = new OracleConnectionCacheImpl(); occi.setServerName("myserver"); occi.setNetworkProtocol("tcp");

Composing functions is just one way to compute interesting new functions. Another useful way is by using partial application. Here s an example: let let let let let shift (dx,dy) (px,py) = (px + dx, py + dy) shiftRight = shift (1,0) shiftUp = shift (0,1) shiftLeft = shift (-1,0) shiftDown = shift (0,-1)

The examples in this section assume that occi is an initialized OracleConnectionCacheImpl variable. You can set the minimum number of pooled connections by invoking the setMinLimit() method as follows: occi.setMinLimit( 3 ); The cache will keep three pooled connections open and ready for use at all times. You can set the maximum number of pooled connections by invoking the setMaxLimit() method as follows: occi.setMaxLimit( 10 );

Figure 4-5 Our test page with ViewState enabled for the textbox It doesn t follow, however, that in order to use Web Controls properties you must leave ViewState enabled Properties that are set from markup (that is, attributes set on the Web Control in the actual ASPX page) don t need ViewState to maintain these values across postbacks As you saw in 3, the markup actually becomes a piece of code that gets executed at runtime Each attribute set from control declarations in the markup becomes a line of code calling a property set method in the generated code This code gets executed with each page request, postback or not So you need ViewState when you interact with controls programmatically from a branch of code that executes only on the first request for a page, but you want those changes to persist across postbacks.

The last four functions have been defined by calling shift with only one argument, in each case leaving a residue function that expects an additional argument. F# Interactive will report the types as follows: val val val val val shift : int * int -> int * int -> int * int shiftRight : int * int -> int * int shiftLeft : int * int -> int * int shiftUp : int * int -> int * int shiftDown : int * int -> int * int Here is an example of how to use shiftRight and how to apply shift to new arguments (2,2):