C# 4 and .NET 4

1174 ❘ ChaPTer 40 cOre Asp.net
Here you are using red, which will give you a display along the lines of
Figure 40 - 11, in which June 12, 15, and 22 (2010) all contain events.
With the addition of the date - selection logic, it is now impossible to select a
day that is shown in red. If you attempt it, a later date is selected instead (for
example, selecting June 15 results in the selection of June 16).
adding events to the Database
The submitButton_Click() event handler currently assembles a string from the figure 40-11
event characteristics and displays it in the resultLabel control. To add an event
to the database, you simply reformat the string created in a SQL INSERT query and execute it.
Note that in the development environment that you are using, you don ’ t have to worry
too much about security. Adding a SQL Server 2008 Express database via a web site
solution and confi guring SqlDataSource controls to use it will automatically give
you a connection string that you can use to write to the database. In more advanced
situations, you might want to access resources using other accounts — for example,
a domain account used to access a SQL Server instance elsewhere on a network.
The capability to do this (via impersonation, COM+ Services, or other means) exists
in ASP.NET, but is beyond the scope of this chapter. In most cases, confi guring the
connection string appropriately is as complicated as things need to get.
Much of the following code will therefore look familiar:
protected void submitButton_Click(object sender, EventArgs e)
{
if (this.IsValid)
{
System.Text.StringBuilder sb = new System.Text.StringBuilder();
foreach (ListItem attendee in attendeeList.Items)
{
if (attendee.Selected)
{
sb.AppendFormat(“{0} ({1}), “, attendee.Text, attendee.Value);
}
}
sb.AppendFormat(“ and {0}”, nameBox.Text);
string attendees = sb.ToString();
try
{
System.Data.SqlClient.SqlConnection conn =
new System.Data.SqlClient.SqlConnection(
ConfigurationManager.ConnectionStrings[
“MRBConnectionString”].ConnectionString);
System.Data.SqlClient.SqlCommand insertCommand =
new System.Data.SqlClient.SqlCommand(“INSERT INTO [Events] “
+ “(Name, Room, AttendeeList, EventDate) VALUES (@Name, “
+ “@Room, @AttendeeList, @EventDate)”, conn);
insertCommand.Parameters.Add(
“Name”, SqlDbType.VarChar, 255).Value = eventBox.Text;
insertCommand.Parameters.Add(
“Room”, SqlDbType.Int, 4).Value = roomList.SelectedValue;
insertCommand.Parameters.Add(
“AttendeeList”, SqlDbType.Text, 16).Value = attendees;
insertCommand.Parameters.Add(
“EventDate”, SqlDbType.DateTime, 8).Value =
calendar.SelectedDate;
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