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rdlc ean 128

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Even when you disable view state for the entire page, you ll still see the hidden view state tag with a small amount of information. That s because ASP.NET always stores the control hierarchy for the page at a minimum, even if view state is disabled. There s no way to remove this last little fragment of data.

Each column can be any of several different types, as described in Table 10-1. The order of your column tags determines the right-to-left order of columns in the GridView. Table 10-1. Column Types

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The object data source handles the problem better, because it gives you the option to reroute the command to another method. If you find that a full list of employees is required, you can remove the City parameter altogether and use a no-parameter method for retrieving all the employees. Here s how it works: Protected Sub sourceEmployees_Selecting(ByVal sender As Object, ByVal e As ObjectDataSourceSelectingEventArgs) If e.InputParameters("employeeID") Is Nothing Then e.Cancel = True End If If CStr(e.InputParameters("City").Value) = "(Choose a City)" Then ' Do nothing. e.Cancel = True ElseIf CStr(e.InputParameters("City").Value) = "(All Cities)" Then ' Manually change the method. sourceEmployees.SelectMethod = "GetAllEmployees" e.InputParameters.Remove("City") End If End Sub This solution isn t possible with the SqlDataSource, because the command logic is embedded into the data source control. Still, this approach can easily be abused and lead to code that is difficult to maintain. For example, you won t receive any warning if you rename, remove, or modify the parameters for the GetAllEmployees() method. In this case, you ll receive an error only when you run the page and click the (All Cities) option.

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As described in earlier chapters, view state information is stored in a single Base64-encoded string that looks like this: <input type="hidden" name="__VIEWSTATE" value="dDw3NDg2NTI5MDg7Oz4="/> Because this value isn t formatted as clear text, many ASP.NET programmers assume that their view state data is encrypted. It isn t. A clever hacker could reverse-engineer this string and examine your view state data in a matter of seconds, as demonstrated in 3. If you want to make view state secure, you have two choices. First, you can make sure that the view state information is tamper-proof by using a hash code. You do this by adding the EnableViewStateMAC attribute to the Page directive in your .aspx file, as shown here: <%@ Page EnableViewStateMAC="true" %> A hash code is a cryptographically strong checksum. Essentially, ASP.NET calculates this checksum based on the current view state content and adds it to the hidden input field when it returns the page. When the page is posted back, ASP.NET recalculates the checksum and ensures that it matches. If a malicious user changes the view state data, ASP.NET will be able to detect the change, and it will reject the postback. Hash codes are enabled by default, so if you want this functionality, you don t need to take any extra steps. Occasionally, developers choose to disable this feature to prevent problems in a web farm where different servers have different keys. (The problem occurs if the page is posted back and handled by a new server, which won t be able to verify the view state information.) To disable hash codes, you can use the enableViewStateMac attribute of the <pages> element in the web.config or machine.config file, as shown here: <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <system.web> <pages enableViewStateMac="false" /> ... </system.web> </configuration>

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Summary

This column displays text from a field in the data source. This column displays a button for each item in the list. This column displays a check box for each item in the list. It s used automatically for true/false fields (in SQL Server, these are fields that use the bit data type). This column provides selection or editing buttons.

This step is strongly discouraged. It s much better to configure multiple servers to use the same key, thereby removing any problem. 5 describes how to do this.

In this chapter, you looked at data binding expressions and the ASP.NET data source controls in detail. Along the way, you started using the GridView, ASP .NET s premier rich data control. In the next chapter, you ll explore the three most powerful data-bound controls in detail: the GridView, DetailsView, and FormView. You ll also learn how they work with a few data source features that this chapter didn t cover, such as sorting and filtering.

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