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Figure 10-8. Application for updating DiffGrams The Load event handler of the form contains the code shown in Listing 10-27. Listing 10-27. Filling a DataSet string strConn = @"Provider=SQLOLEDB;server=.; database=northwind;user id=sa;password=sa"; DataSet ds = new DataSet(); private void Form1_Load(object sender, EventArgs e) { SqlXmlCommand cmd = new SqlXmlCommand(strConn); cmd.RootTag = "ROOT"; cmd.CommandText = "Employees"; cmd.CommandType = SqlXmlCommandType.XPath; cmd.SchemaPath = Application.StartupPath + @"\employees.xsd"; SqlXmlAdapter da = new SqlXmlAdapter(cmd); da.Fill(ds); dataGridView1.DataSource = ds.Tables[0].DefaultView; } The code should be familiar to you, as you used it in previous examples. It simply populates a DataSet by using the SqlXmlAdapter class. The DataSet acts as the DataSource for the DataGridView control. The code that saves this DataSet as a DiffGram goes in the Click event of the Save DiffGram button and is shown in Listing 10-28.

After Evolution has been set up correctly to work with your e-mail servers, you can simply click the Send/Receive button on the toolbar to connect to the server(s) and both send and receive e-mail. You may need to enter your password if you didn t enter it during setup. You can select the Remember Password check box in Account Preferences (Edit Preferences) to avoid having to type your password again, but the password will then be stored on your hard disk, posing a security risk if other people have access to your PC.

s Note If you re from an ADO background, an ADO.NET data reader is like an ADO forward-only/read-only

Note Although e-mail is normally sent as soon as you click the Send button after composing it, if the sending has been delayed for any reason (such as being offline at the time), it will take place as soon as you click the Send/Receive button. Until that point, it will be held in the Outbox folder on the left side of the program window. You may need to choose File Work Online if you ve been composing e-mail in offline mode.

Listing 10-28. Saving a DataSet as a DiffGram private void button2_Click(object sender, EventArgs e) { StreamWriter writer=File.CreateText(Application.StartupPath + @"\employees.xml"); ds.WriteXml(writer, XmlWriteMode.DiffGram); writer.Close(); } The code calls the WriteXml() method of DataSet to save its contents to an XML file (Employees.xml). The XmlWriteMode parameter of WriteXml() indicates that DiffGram format is to be used while writing the data. This DiffGram is executed against the database when you click the Update DiffGram button. The Click event handler of the Update DiffGram button is shown in Listing 10-29. Listing 10-29. Updating a DiffGram in a Database private void button1_Click(object sender, EventArgs e) { StreamReader reader = File.OpenText(Application.StartupPath + @"\employees.xml"); SqlXmlCommand cmd = new SqlXmlCommand(strConn); cmd.CommandType = SqlXmlCommandType.DiffGram; cmd.CommandText = reader.ReadToEnd(); cmd.SchemaPath = Application.StartupPath + @"\employees.xsd"; cmd.ExecuteNonQuery(); MessageBox.Show("DiffGram updated to database successfully!"); } The code opens the Employees.xml file in a StreamReader object. It then creates an instance of the SqlXmlCommand class and sets the CommandType property of the SqlXmlCommand instance to DiffGram. This is how you tell SqlXmlCommand about your intention to update a DiffGram. When the CommandType is DiffGram, the CommandText property must contain the DiffGram itself. The ReadToEnd() method of StreamReader reads the complete DiffGram and assigns it to the CommandText property. If you wish to update the database by using the DiffGram method, you must specify the SchemaPath property also. In this case, the schema is the same as we created in Listing 10-21 earlier. Finally, the ExecuteNonQuery() method of the SqlXmlCommand is called to save all the changes to the database. The ExecuteNonQuery() method is used for executing queries that do not return anything. In our example, we simply want to update the DiffGram to the database and hence we used the ExecuteNonQuery() method.

Any outstanding mail is sent first, and then the receiving procedure is started. As shown in Figure 14-3, a status dialog box will tell you how many messages there are and the progress of the download.

Data readers are objects that implement the System.Data.IDataReader interface. A data reader is a fast, unbuffered, forward-only, read-only connected stream that retrieves data on a per-row basis. It reads one row at a time as it loops through a result set. You can t directly instantiate a data reader; instead, you create one with the ExecuteReader method of a command. For example, assuming cmd is a SqlClient command object for a query, here s how to create a SqlClient data reader: Dim rdr As SqlDataReader=cmd.ExecuterReader You can now use this data reader to access the query s result set.