Vb net datagridview not updating
NET objects with VS 2005 and SQL Server 2000 or 2005. VS 2005 materializes Table Adapters, Data Sets, Binding Sources, and Binding Navigators as named objects in the form design tray.Figure 1-5 compares the objects required by updatable ADODB Recordsets and ADO. Table Adapters and Data Sets also appear in the Toolbox's Project Name Components section; the Data section has Data Set, Binding Source, and Binding Navigator controls.You must choose Project➪Show All Files to see Northwind Data Set. Later chapters describe how to save and reload pending Data Set changes that haven't been committed to the base tables. Auto argument is the default, so including it is optional.and two empty Northwind Data and Northwind Data files. Write Xml(str Path "Custs No Schema.xml", Xml Write Mode. Write Xml(str Path "Custs With Schema.xml", Xml Write Mode. Write Xml Schema(str Path "Custs Schema.xsd") End With End Sub Persisting the Data Set as an XML document without the embedded schema lets you support disconnected users by reloading the Data Set from the file. The sample project at this point is Generated Data Grid in your VB2005DBChapter01 Generated Data Grid View folder.Adding a typed Data Set generates an XSD schema, Northwind Data for this example, and adds 1,197 lines of VB 2005 code to the Northwind Data Set. Partial classes are a new VB 2005 and C# feature that enable extending a class, such as Northwind Data Set, with additional class files. Read Xml(str Path "Custs No Schema.xml", Xml Read Mode.VB 2005 uses the Public Partial Class class Name statement to identify a partial class file. Auto) The real-world scenario for persisting and reloading Data Sets is more complex than that shown here.Add a Typed Data Set from an SQL Server Data Source ADO.
The part of the schema that defines the elements for the table fields grows from 30 to 94 lines because element definitions now contain max Length attribute values and use restriction Base attributes to specify XSD data types. The section "Create a Complete Data Entry Form in One Step," later in this chapter, includes code to save the schema for the Northwind Customers Data Set. Changes you make to the Data Grid View don't propagate to the table until you click the Save Data button. Delete the Data Grid View control, display the Data Sources window, open the dropdown list for the Data Table, and select Details, as shown in Figure 1-13.
The following tip was excerpted from Chapter 1, 'Migrating from ADO to ADO.
NET,' of the book Expert One-on-one Visual Basic 2005 Database Programming by Roger Jennings, courtesy of Wiley Publishers.
Unlike the Data Environment Designer, multi-table Data Sets don't have the hierarchical structure that the OLE DB Shape provider creates for display in VB6's Hierarchical Flex Grid control.
Web services and object instances also can act as ADO. Figure 1-5 Here's how to add a new SQL Server Northwind data source for a new Windows form project and automatically generate a typed Data Set and its components from the Customers table: 1.Learn why you shouldn’t get distracted by new DB technology, how Facebook is using a RDBMS to do the data slicing and dicing they can’t in Hadoop, and more. NET and typed Data Sets are the preferred method for retrieving and updating relational tables, although Data Sets aren't limited to processing relational data.