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The control does its job when the page posts back. The uploaded file can be accessed by name using the FileName property or by stream using the FileContent property. To access more specific information about the posted file, you can use the object returned by the PostedFile property. Finally, SaveAs is the method that makes a copy of posted file to a server-side file. Note that the final folder must exist otherwise, an exception is thrown.
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void UploadButton_Click(object sender, EventArgs e) { // Specify the path on the server to save the uploaded file to string savePath = @"c:\temp\uploads\";
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if (FileUpload1.HasFile) { string fileName = FileUpload1.FileName; savePath += fileName; FileUpload1.SaveAs(savePath); UploadStatusLabel.Text = File saved as: <i> + savePath + </i>"; } else { // Notify the user that a file was not uploaded UploadStatusLabel.Text = You did not specify a file to upload."; } }
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Figure 1-13 The typical user interface of the upload control
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In this chapter, we covered the three entities that form the foundation of Web applications written with ASP.NET the development environment, the page object, and the controls. In ASP.NET 2.0, an updated and more powerful designer makes developing Web applications easier than ever, and even pleasant. The ASP.NET designer of Visual Studio 2005 solves all the issues of today s Web development tools and delivers a high-quality IDE that is easier to use and more productive. The Page class is the basis of all the Web forms dynamically created from .aspx resources. The class has been enhanced to support personalization, themes, and a more powerful scripting object model that finds its best expression in cross-page postbacks and script callbacks.
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Part I ASP.NET Essentials
New core controls populate the pages; these include Web wizards, the MultiView control, and bulleted lists. Perhaps the most remarkable aspect of ASP.NET 2.0 controls is the unified model that ties together desktop controls and mobile controls. As a result, pagination and control state make their debut in the world of ASP.NET, and a family of more powerful controls can be used to create mobile applications. The adaptive rendering simplifies the design of Web applications, making the optimization for multiple devices a small supplementary application when not simply a form of customization. In the next chapter, we ll begin exploring the programming world of ASP.NET 2.0. We ll start with the most requested new feature in ASP.NET 2.0: master pages.
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Working with Master Pages
It took developers little time to realize that something was missing in the ASP.NET approach to creating Web pages and Web sites. Certainly ASP.NET greatly simplified the process. However, after a few months of real-world experience, many developers recognized that they needed more effective and powerful tools to build useful Web applications with the same ease that they could build simple sites. Almost all Web sites use a similar graphical layout for all their pages. This doesn t happen by chance it grows out of accepted guidelines for design and usability. A consistent layout is characteristic of all cutting-edge Web sites, no matter how complex. For some Web sites, the layout consists of the header, body, and footer; for others, it is a more sophisticated aggregation of menus, buttons, and panels that contain and render the actual content. The question is, how can you effectively build such Web sites I wouldn t be giving you the best advice if I told you to manually duplicate your code and HTML elements. Making your code automatically reusable represents a better approach, but how do you implement it, in practice Both classic ASP and ASP.NET 1.x provide good workarounds for this type of issue, but neither tackles such a scenario openly and provides a definitive, optimal solution. ASP.NET 2.0 faces up to the task through a new technology master pages and basically exploits the ASP.NET Framework s ability to merge a supertemplate with user-defined content replacements.
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