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After receiving signed XML data from InfoPath as a string in your Web service method, be very careful if you decide to load that XML string into an XmlDocument or Document Object Model (DOM) If you must load the data into an XmlDocument, for example, ensure that it will preserve all white space and not modify its data Any modi cation to the data will render the form signature invalid
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Let s talk about how to set up a Web service submit connection on a form that has digitally signed data When con guring the parameters mapping dialog (refer back to Figure 825), you ll want to select both the Entire form option as well as check the Submit data as a string checkbox Consider the note text below the checkbox ( Note: Digitally signed data must be submitted as a string to preserve white spaces ) to be a friendly reminder for future reference! Forgot to Sign In the beginning of the chapter (and as shown in Figure 81), we discussed how InfoPath helps guide the user to submit a form if he or she attempts to save it Similarly, InfoPath also sways the user to sign the form if he or she didn t already do so before attempting to submit The user will be reminded about signing only when lling out a form that allows the form data to be digitally signed Figure 826 shows the prompt that appears when a user submits an unsigned form in that situation Notice that the Yes button has focus by default, so hitting Enter or Return on the keyboard will automatically show the signing dialog To con gure whether or not you want the prompt shown in Figure 826 to appear to your users, use the related checkbox on the Form Options dialog s
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Figure 826: Dialog that gives the user a chance to digitally sign a form before continuing with submit
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Browser-enabled form templates do not allow for signing the entire form Since the Prompt user to sign the form if it is submitted without a signature checkbox is associated with signing the entire form, it s not an available option
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Figure 827: Controlling whether or not to display the prompt shown in Figure 826
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Digital Signatures tab (Figure 827) Note that you can show the prompt only if digital signatures are enabled for the entire form If instead you wanted to select the Enable digital signatures for speci c data in the form item, this option would not be available It is possible, however, to write custom code when the form is submitted to check that all speci c data in the form is signed This is a complex scenario that you should be able to implement after understanding the material presented in 15 when we discuss writing custom form code We ll learn all about digitally signing form data in 11
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In 7, we learned how to create a Web service by writing some C# code that returns an ADONET DataSet In this chapter, we ll bring closure to this topic by showing an end-to-end example of designing a form to receive and submit (update) the back-end data We ll focus more on the submit portion of the exercise not only because it s the main topic of this chapter but also because it s not as straightforward as other submit connections
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A DataSet object can only be submitted from the main data source Secondary data sources can receive a DataSet object but do not track changes, so they cannot be submitted back to the Web service Using the main data source is a necessity if you want to submit your data back to the Web service for updating the database The main data source performs change tracking (an ADONET requirement) and serializes the DataSet object automatically upon submit
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For our back-end data, we ll use a customers database similar to the Northwind example from 7 But this time, the customers will be those from the MOI Consulting rm We created a new database called MOIConsulting with table Customers Table 84 outlines the database structure
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Table 84: Structure of the Customers Table for the MOI Consulting Firm Column Name Data Type Comments
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