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That control is declared like this: <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="RolesDataSource" DataKeyNames="Id"> <Columns> <asp:BoundField DataField="Id" HeaderText="Id" ReadOnly="True" SortExpression="Id" /> <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" /> <asp:CommandField ShowDeleteButton="True" ShowEditButton="True" /> </Columns> </asp:GridView> The DataSourceID property establishes data binding to the RolesDataSource control The DataKeyNames property specifies the name of the property on the business object that acts as a primary key for the object For a Role object, this is Id Remember the use of the DataObjectField attribute on the Id property in 8, which provides a hint to Visual Studio that this property is the object s unique key value The first two columns in the GridView control are bound to properties from the data source: Id and Name, respectively The third column is a CommandField, which automatically adds Delete and Edit links next to each element in the list.

For the first part of this discussion, we ll assume that constraints are in IMMEDIATE mode, which is the norm. In this case, the integrity constraints are checked immediately after the entire SQL statement has been processed. Note that I used the term SQL statement, not just statement. If I have many SQL statements in a PL/SQL stored procedure, each SQL statement will have its integrity constraints validated immediately after its individual execution, not after the stored procedure completes. So, why are constraints validated after the SQL statement executes Why not during This is because it is very natural for a single statement to make individual rows in a table momentarily inconsistent. Taking a look at the partial work by a statement would result in Oracle rejecting the results, even if the end result would be OK. For example, suppose we have a table like this: ops$tkyte%ORA11GR2> create table t ( x int unique ); Table created. ops$tkyte%ORA11GR2> insert into t values ( 1 ); 1 row created. ops$tkyte%ORA11GR2> insert into t values ( 2 ); 1 row created. ops$tkyte%ORA11GR2> commit; Commit complete. And we want to execute a multiple-row UPDATE: ops$tkyte%ORA11GR2> update t set x=x-1; 2 rows updated. If Oracle checked the constraint after each row was updated, on any given day we would stand a 5050 chance of having the UPDATE fail. The rows in T are accessed in some order, and if Oracle updated the X=1 row first, we would momentarily have a duplicate value for X and it would reject the UPDATE. Since Oracle waits patiently until the end of the statement, the statement succeeds because by the time it is done, there are no duplicates.

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The Delete link automatically triggers the DeleteObject to delete the specified object The Edit link puts the row into in-place edit mode, allowing the user to edit the data in the selected row If the user accepts their updates, the UpdateObject event is automatically raised No code beyond that handling those events is required to support either of these links..

known, IL code verification procedures don t have to be performed. The instance constructor has no parameters. A module owning this attribute can be executed only in full-trust mode. System.ThreadStaticAttribute: This attribute, which can be owned by a field, indicates that the static field is not shared between threads. Instead, the common language runtime creates an individual copy of the static field for each thread. The effect is approximately the same as mapping the static field to the TLS data, but this effect is achieved on the level of the runtime rather than that of the operating system. The runtime-provided TLS is marginally slower but does not introduce the platform dependence.

Table 2-3. The C# Keywords abstract as base bool break Byte case catch char checked class const continue decimal default delegate do double else enum event explicit extern false finally fixed float for foreach goto if implicit in int interface internal is lock long namespace new null object operator out override params private protected public readonly ref return sbyte sealed short sizeof stackalloc static string struct switch this throw true try typeof uint ulong unchecked unsafe ushort using virtual void volatile while

Before getting into the details of the framework s design, let s discuss the desired set of features in more detail.

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