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values.Add(txtLName.Text) values.Add(txtPhone.Text) values.Add(txtEmail.Text) ' Add the optional values or Null If (txtAddress.Text.Length <> 0) Then values.Add("'" + txtAddress.Text + "'") Else values.Add("Null") End If If (txtMobile.Text.Length <> 0) Then values.Add("'" + txtMobile.Text + "'") Else values.Add("Null") End If If txtBirth.Text.Length <> 0 Then Dim dt As DateTime = DateTime.Parse(txtBirth.Text) ' Pass date in ISO format YYYYMMDD values.Add("'" + dt.ToString("yyyyMMdd") + "'") Else values.Add("Null") End If ' Get the UserID from the context values.Add(Context.User.Identity.Name) ' Format the query with the values sql = String.Format(sql, values.ToArray()) ' Connect and execute the query Dim con As New SqlConnection( _ "data source=.;initial catalog=FriendsData;" + _ "user id=apress;pwd=apress") Dim cmd As New SqlCommand(sql, con) con.Open() Dim doredirect As Boolean = True Try cmd.ExecuteNonQuery() Catch ex As SqlException doredirect = False lblMessage.Visible = True lblMessage.Text = "Couldn't update your profile!" Finally

Before we move on to the next topic of this chapter, columns, I would like to share with you some general tips and some small cool ideas you may want to explore.

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con.Close() End Try If doredirect Then Response.Redirect("../Default.aspx") End Sub 9. Finally, add the following code to the now empty If statement in the btnAccept_Click() handler: Private Sub btnAccept_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles btnAccept.Click If Page.IsValid Then If Context.User.Identity.IsAuthenticated Then UpdateUser() Else InsertUser() End If Else lblMessage.Text = "Fix the following errors and retry:" End If End Sub 10. Save and compile the project. If you run the project again and log in to the application, you can click the new link in the subheader and not only see the form preloaded with values, but also change any of its values. It s even possible for the users to change their user name, because that s not being used as the primary key for the table!

SiteMapResolve event, SiteMap class displaying dynamic content, 163 168 skins creating, 115 Solution Explorer, 29 31 special folders, 30 Split command, Window menu, 26 sprocs see stored procedures SQL (Structured Query Language) Data Control Language (DCL), 56 Data Definition Language (DDL), 54 database engine extensions, 47 SQL Server caching, 309 317 command line, working with, 65 data organization, 50 56 database objects, 51 installed databases, 50 log file, 50 sa account, 49 T-SQL, 53 SQL Server Express, 46 50 Application XCopy, 48 authentication modes, 49 cache size for data caching, 48 CLR support, 49 command line, working with, 61 Computer Manager tool, 56 connection strings, 47 design goals, 47 Express Manager tool, 56 creating database in, 60 installing, 56 management tools, 48, 56 65 mixed mode authentication, 49 Shared Memory access, 50 SQL Server Express (continued) SQL Server compared, 46, 47 49 SQL Server provider, 66 VWD integration, 65 76 creating database objects, 69 76

How It Works The change in the SubHeader control is very straightforward: just change the text of the link according to the IsAuthenticated property for the current request. The interesting thing is happening in the Page_Load() method, where you create the database connection and command objects as usual, but assign the result of executing the command to a variable of type SqlDataReader: Dim reader as SqlDataReader = cmd.ExecuteReader() To read the values that form the result of our query, you start by checking that a row has actually been returned, by calling the Read() method: If reader.Read() Then After that, and in order to show all the available ways to retrieve the values, you use several options that are available with the reader. First, you use the GetOrdinal() method to retrieve the position of a column in the reader, so that you can get a typed string using the GetString() method, which needs this value: ' Retrieve a typed value using the column's ordinal position Dim pos As Integer = reader.GetOrdinal("Address") txtAddress.Text = reader.GetString(pos).ToString()

I need to tell you about this, because it took me literally hours figuring this one out the first time it happened. If, by chance, you happen to make a mistake with your rendering template, for example by adding the wrong ID or removing the TextBox, you get an error message stating that you need to check your "TextField" rendering template. Figure 11-7 shows this error message.

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