Specify Data Sources and Data Members Consistently in .NET framework

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Specify Data Sources and Data Members Consistently
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It is important to specify your data sources and data members for bound controls on a form consistently If you specify data sources using different reference types between different bound controls, you won't get synchronized updating of the controls when the current row selection changes on the form
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If you wanted to violate this guidance and specify data bindings for your text boxes using the form just shown, but still wanted the text boxes to be synchronized with the data bound to the grid, then you'd also need to specify the data source and data member for the grid consistently You would need to modify the form load event handler code to look like this instead: private void OnFormLoad(object sender, EventArgs e) { CustomersDataSet nwData = CustomersDataSetGetCustomers(); // Alternative approach:
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m_CustomersGridDataSource = nwData; m_CustomersGridDataMember = "Customers";
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If you added this change in addition to the one shown in Listing 35 for the text boxes, you could run the application again and select rows in the grid, and the contents of the text boxes would be updated with each row selection in the grid as before Because the data sources are now specified to be exactly the same object reference (the data set), only one synchronization object gets created and used for all of the controls Whereas the now-obsolete DataGrid control could be bound to a data set and it would present a hierarchical way of navigating the tables contained within the data set, theDataGridView control is designed to only be bound to a single list at a time If you set the DataSource property on a DataGridView to a data set without specifying a table within that data set as the DataMember property, the grid will remain blank
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Synchronizing Data Between Controls
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Let's take another look at what is going on when you bind a control or multiple controls to a set of data on a form As mentioned earlier, when you create the data bindings, the form itself creates some synchronization objects to manage the fact that you may have multiple controls on the form bound to the same data source, and that you (probably) want them to be synchronized The form itself has a BindingContext property that holds a collection of synchronization objects for each data source that is being used for data binding on the form For the most part in NET 20, you don't have to deal directly with the binding context in your code, but it is still lurking under the covers making things work (In NET 1X, you had to go through the binding context to get to the synchronization objects for a number of scenarios) As discussed in the previous section, what gets created behind the scenes are instances of a CurrencyManager for list-based data sources or aPropertyManager for individual custom business objects Each of these classes derives from BindingManagerBase, which is the type of object reference that theBindingContext is designed to contain The CurrencyManager is the one you will deal with most often A container component (such as a Form or a BindingSource) creates a currency manager for each list-based data source that you specify for a control on a form, and it is added to the binding context for the form The currency manager keeps track of both the underlying data source that controls are bound to and the controls that are bound to that data You can use the currency manager to access the underlying data that is bound to controls, determine what the current row or object is, and change that current row and affect all of the controls that are bound to it The currency manager notifies bound controls when items are added, removed, or changed in the bound collection, and controls can use these notifications to refresh their display of the data source
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