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string sqlCat = "SELECT CategoryID, CategoryName FROM Categories"; string sqlProd = "SELECT ProductName, CategoryID FROM Products"; SqlDataAdapter da = new SqlDataAdapter(sqlCat, con); DataSet ds = new DataSet(); Next, the code executes both queries, adding two tables to the DataSet Note that the connection is explicitly opened at the beginning and closed after the two operations, ensuring the best possible performance try { conOpen(); // Fill the DataSet with the Categories table daFill(ds, "Categories"); // Change the command text and retrieve the Products table // You could also use another DataAdapter object for this task daSelectCommandCommandText = sqlProd; daFill(ds, "Products"); } finally { conClose(); } In this example, the same DataAdapter is used to fill both tables This technique is perfectly legitimate, and it makes sense in this scenario because you don t need to reuse the DataAdapter to update the data source.

However, if you were using the DataAdapter both to query data and to commit changes, you probably wouldn t use this approach Instead, you would use a separate DataAdapter for each table so that you could make sure each DataAdapter has the appropriate insert, update, and delete commands for the corresponding table At this point you have a DataSet with two tables These two tables are linked in the Northwind database by a relationship against the CategoryID field This field is the primary key for the Categories table and the foreign key in the Products table Unfortunately, ADONET does not provide any way to read a relationship from the data source and apply it to your DataSet automatically Instead, you need to manually create a DataRelation that represents the relationship A relationship is created by defining a DataRelation object and adding it to the DataSet Relations collection.

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Once there are no more items to be returned, is also responsible for telling Python to stop using the iterator and to move on after the loop. This is done by raising the exception. Python will continue calling until an exception is raised, causing an infinite loop. Either should be used to stop the loop gracefully or another exception should be used to indicate a more serious problem.

When you create the DataRelation, you specify three constructor arguments: the name of the relationship, the DataColumn for the primary key in the parent table, and the DataColumn for the foreign key in the child table Here s the code you need for this example: // Define the relationship between Categories and Products DataRelation relat = new DataRelation("CatProds", dsTables["Categories"]Columns["CategoryID"], dsTables["Products"]Columns["CategoryID"]); // Add the relationship to the DataSet dsRelationsAdd(relat);.

A WebPart provider can make multiple connection points available, while a WebPart consumer can consume multiple provider connection points. In that case, every connection point requires a unique ID on both the consumer side and the provider side. On the provider side, you specify the connection point ID in the [ConnectionProvider] attribute, as follows: [ConnectionProvider("Notes Text", "MyProviderID")] public INotesContract GetNotesCommunicationPoint() { return (INotesContract)this; } You can specify an ID for consumer end points in the same way if a WebPart is a consumer of multiple providers, as follows: [ConnectionConsumer("Customer Notes", "MyConsumerID")] public void InitializeProvider(INotesContract provider) { _NotesProvider = provider; } These IDs have to be unique within the WebPart. This means other WebParts can define connection points with the same ID. When configuring static connections for WebParts that support multiple connection points, you have to specify those through additional ProviderConnectionPointID and ConsumerConnectionPointID parameters, as follows:

<asp:WebPartManager runat="server" ID="MyPartManager"> <StaticConnections> <asp:WebPartConnection ProviderID="MyCustomerNotes" ProviderConnectionPointID="MyProviderID" ConsumerID="MyCustomerNotesConsumer" ConsumerConnectionPointID="MyConsumerID" /> </StaticConnections> </asp:WebPartManager> In the case of dynamic configuration, the user can select the connection point to connect to based on the name specified as first parameter in the previously used [ConnectionProvider] and [ConnectionConsumer] attributes.

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