Download A Programmer's Guide to ADO .NET in C# by Mahesh Chand PDF

By Mahesh Chand

Being a programmer for years, yet new to the ADO / .NET atmosphere, this ebook was once a good option. i admire how it used to be designed. It used to be effortless to stick with.

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If it doesn’t find the original data, it won’t update the data source. A data provider maintains two sets of parameters: one with the original data and one with the current data. The current data parameters work in the UPDATE statement (this is the data you’re trying to update the database with), and the original data parameters work in the WHERE clause (these parameters are the check to make sure the database hasn’t been updated). If you turn off the Use Optimistic Concurrency option, the WHERE clause only contains the primary key and no original parameter data is generated.

You call Fill method in FillDBGrid method. Once you have a DataSet containing data, you can do anything with it including creating views for that data. DefaultViewManager, which binds the DataSet object to the DataGrid control (see Listing 4-3). Listing 4-3. DefaultViewManager; } Now you simply call FillDBGrid from the Form1 constructor or the Form_Load event or from a button-click handler. In this example I’ll call it from the form constructor just after the InitializeComponent() call, as you can see in Listing 4-4.

Data Adapter option links The Preview Data option enables you to view the DataSet schema. You can even preview the data in the DataSet by clicking the Fill button. The Data Adapter Preview dialog box looks like Figure 4-33. 40 185 933ch4 3/20/02 11:03 AM Page 186 Chapter 4 Figure 4-33. Previewing data for the data adapter The Fill Dataset button in Figure 4-33 fills data into a grid based upon the current state of the SelectCommand in the DataAdapter. Step 5: Reviewing the Source Code Now it’s time to examine the code and see what the wizard has done for you automatically.

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