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First, create the DataSet. Next, create a new DataTable, and add it to the DataSet.Tables collection. Next, define the structure of the table by adding DataColumn objects (one for each field) to the DataTable.Colums collection. Finally, supply the data. You can get a new, blank row that has the same structure as your DataTable by calling the DataTable.NewRow() method. You must then set the data in all its fields, and add the DataRow to the DataTable.Rows collection.

Dim con As New SqlConnection(connectionString) Dim cmd As New SqlCommand(insertSQL, con) ' Add the parameters. cmd.Parameters.AddWithValue("@au_id", txtID.Text) cmd.Parameters.AddWithValue("@au_fname", txtFirstName.Text) cmd.Parameters.AddWithValue("@au_lname", txtLastName.Text) cmd.Parameters.AddWithValue("@phone", txtPhone.Text) cmd.Parameters.AddWithValue("@address", txtAddress.Text) cmd.Parameters.AddWithValue("@city", txtCity.Text) cmd.Parameters.AddWithValue("@state", txtState.Text) cmd.Parameters.AddWithValue("@zip", txtZip.Text) cmd.Parameters.AddWithValue("@contract", Val(chkContract.Checked)) ' Try to open the database and execute the update. Dim added As Integer = 0 Try con.Open() added = cmd.ExecuteNonQuery() lblResults.Text = added.ToString() & " record inserted." Catch err As Exception lblResults.Text = "Error inserting record. " lblResults.Text &= err.Message Finally con.Close() End Try ' If the insert succeeded, refresh the author list. If added > 0 Then FillAuthorList() End If End Sub Now that the values have been moved out of the SQL command and to the Parameters collection, there s no way that a misplaced apostrophe or scrap of SQL can cause a problem.

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Here s how the code unfolds: // Define a DataSet with a single DataTable. DataSet dsInternal = new DataSet(); dsInternal.Tables.Add("Users"); // Define two columns for this table. dsInternal.Tables["Users"].Columns.Add("Name"); dsInternal.Tables["Users"].Columns.Add("Country"); // Add some actual information into the table. DataRow rowNew = dsInternal.Tables["Users"].NewRow(); rowNew["Name"] = "John"; rowNew["Country"] = "Uganda"; dsInternal.Tables["Users"].Rows.Add(rowNew); rowNew = dsInternal.Tables["Users"].NewRow(); rowNew["Name"] = "Samantha"; rowNew["Country"] = "Belgium"; dsInternal.Tables["Users"].Rows.Add(rowNew); rowNew = dsInternal.Tables["Users"].NewRow(); rowNew["Name"] = "Rico"; rowNew["Country"] = "Japan"; dsInternal.Tables["Users"].Rows.Add(rowNew); Next, you bind the DataTable from the DataSet to the appropriate control. Because list controls can only show a single column at a time, you also need to choose the field you want to display for each item by setting the DataTextField property: // Define the binding. lstUser.DataSource = dsInternal.Tables["Users"]; lstUser.DataTextField = "Name"; Alternatively, you could use the entire DataSet for the data source, instead of just the appropriate table. In that case, you would have to select a table by setting the control s DataMember property. This is an equivalent approach, but the code is slightly different: // Define the binding. lstUser.DataSource = dsInternal; lstUser.DataMember = "Users"; lstUser.DataTextField = "Name";

on e-commerce websites weren t fueled by hard-core hacker knowledge but were made using simple SQL injection by modifying values in web pages or query strings.

As always, the last step is to activate the binding: this.DataBind(); The final result is a list with the information from the specified database field, as shown in Figure 15-8. The list box will have an entry for every single record in the table, even if it appears more than once, from the first row to the last.

Tip The simple list controls require you to bind their Text or Value property to a single data field in the data

When the user clicks the Update button, the information in the text boxes is applied to the database as follows:

What this step actually does is define that you will be using the RPC style and encoding data using SOAP The only thing to watch for is the soapAction attribute, which needs to be set to a unique URI Usually, this URI is the value for xmlns:tns plus the name of the operation Finally, the service element puts it all together into a web server location Unlike the namespace URIs, which are just unique information and not actual web resources, the address here must be the URL to the physical PHP file that will host your SoapServer..

source object. However, much more flexibility is provided by the more advanced data binding controls examined in the next chapter. They allow fields to be combined in just about any way you can imagine.

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