InfoPath Interview Questions

Q. How do I retrieve the value of an InfoPath field through code?
Ans.
XPathNavigator nav = MainDataSource.CreateNavigator();
string fieldValue = nav.SelectSingleNode("//my:field1", NamespaceManager).Value;

Q. How do I set the value of an InfoPath field through code?
Ans.
XPathNavigator nav = MainDataSource.CreateNavigator();
nav.SelectSingleNode("//my:field1", NamespaceManager).SetValue("myValue");

Q. How do I call a web service through code?
Ans.
// Create an XPathNavigator object to navigate the data source of the web service
XPathNavigator nav = DataSources["HelloWorld"].CreateNavigator();

// Set the value of the parameter to pass to the web service
nav.SelectSingleNode("//dfs:queryFields/tns:HelloWorld/tns:name", NamespaceManager).SetValue("myValue");

// Call the web service
DataSources["HelloWorld"].QueryConnection.Execute();
// Retrieve the results returned by the web service
string results = nav.SelectSingleNode("//dfs:dataFields/tns:HelloWorldResponse/tns:HelloWorldResult", //NamespaceManager).Value;
//where HelloWorld is the name of a data connection to a web service.