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MessageBox.Show(IsNothing(aBook).ToString()) If you try to use the properties or methods of a reference when it s Nothing, an error occurs because there s no instance data to operate on. You will come to recognize this error as System.NullReferenceException. To make a program more robust, you should test whether the reference is null or Nothing. You should be especially careful to make this test if the reference has been passed to the method as a parameter. In this case, your code has less control over the state of the variable before it s passed to the method. The concept of reference types also affects copying, equality testing, and garbage collection. Copying is discussed in 10, equality testing in 12, and 8 discusses garbage collection.

You need this object to translate the output of the Render method to UTF-8 encoding for HTML. 16 On the WebForm1.aspx page, double-click the Label control in the Toolbox window and position the control just beneath the table at the left edge of the form so that your screen looks like this:

Once you have determined the overall scope of your Windows deployment project and the associated network changes, you must develop the technical specifications for the project, detailing server configuration, changes to the network infrastructure, and so on. As much as possible, describe the process of transitioning to the new configuration. Care should be taken while developing this document because it will serve as the road map for the actual transition, much of which is likely to be done by staff members who were not in the planning meetings.

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Sub UpdateRecords() Ensure that conflicting rows don t throw an exception. da.ContinueUpdateOnError = True Send changes to the database, exit if no conflicts. da.Update(ds, Publishers ) If Not ds.HasChanges Then Exit Sub Not all rows were updated successfully.

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enforce serializability on all the statements for that connection, you can instead add a locking hint to a specific query. The HOLDLOCK locking hint in a SELECT statement instructs SQL Server to hold all shared locks for the table on which the hint is specified until the end of the transaction, overriding whatever the current isolation level is. Thus, if the transaction performs a repeated read, the results returned are consistent with the first read. Note

If the input control is empty, the validation always succeeds. Therefore, you might need to add a RequiredFieldValidation to display an error message if the end user didn t type anything in the field. The regular expression is applied either on the client side (using the JScript regular expression engine) or on the server side (using the .NET regular expression engine) if client-side scripts are disabled. The JScript syntax is a subset of the .NET syntax, so in general the same regular expression works well in both cases. But you should either avoid .NET syntax forms that aren t supported by JScript for example, the ( i) option for case-insensitive comparison or disable client-side scripting with the EnableClientScript property.

Configuring the reporting snapshot consists of obtaining the description of the principal database s file names and then creating the snapshot with those descriptors. The following simple example shows the syntax and process for creating a snapshot:

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You are not limited to using the folders created as part of the publishing process. In addition, you can add more folders to create a hierarchical organization, much like the hierarchy you use in a file system on your computer. You can move reports and resources from their original folder to a new folder quite easily. As part of the content management process, you can also create linked reports to create custom versions of a report without physically reproducing the report definition. Report Manager offers several features to help you organize and manage content on the Report Server. You can add, move, or delete folders to manage a logical grouping of items on the server. Once you ve structured folders to your liking, you can move reports, resources, and shared data sources to folders other than the ones to which they were originally published. You can create linked reports to generate alternate versions of a report so you can use different parameter values or security settings for different groups of users. Finally, you can use folder properties and report general properties to modify names and descriptions to help users locate information more easily.

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