C# DynamicEntryaspxcs in VS .NET

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C# DynamicEntryaspxcs
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using System; using SystemDataSqlClient; public partial class DynamicEntry : SystemWebUIPage { private DateTime currentDate; private string strInsert; private SqlCommand sqlCmd; private SqlConnection hookUp; protected void EnterData(object sender, EventArgs e) { currentDate = DateTimeNow; hookUp = new SqlConnection("Server=localhost\\SqlExpress;Database=VoteNow;" + "Integrated Security=True"); strInsert = "INSERT INTO Supporters(LastName, FirstName,";
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ASPNET 35: A Beginner s Guide
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strInsert +="Email, Donation, DateLastContact)VALUES"; strInsert +="(@LName,@FName,@Em,@Donate,@NowDate)"; sqlCmd = new SqlCommand(strInsert, hookUp); sqlCmdParametersAdd("@LName", LNameText); sqlCmdParametersAdd("@FName", FNameText); sqlCmdParametersAdd("@Em", EmText); sqlCmdParametersAdd("@Donate", DonateText); sqlCmdParametersAdd("@NowDate", currentDate); hookUpOpen(); sqlCmdExecuteNonQuery(); hookUpClose(); Label1Text = "Data has been sent"; } }
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Once you get your application set up in Visual Studio 2008, test it Figure 12-18 shows the dynamic interface where the user enters the data Note that the form does not have an input TextBox for the date The C# DateTime generated the correct date and time based on your computer s calendar and clock
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Figure 12-18
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Dynamic input interface
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12: ADONET: Hello Database
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The hand-entered dates show day, month, and year, and all the times are set to 12 AM
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Note: The time generated by the C# code provides precise time automatically
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Figure 12-19
Table showing the dynamic values added to the database
To see how the data look in the table, open the Supporters table in the VoteNow database As you will see, the DateLastContact field has a very precise time Instead of just showing the default 12:00:00 AM, it shows the actual time down to the minute Figure 12-19 shows the exact time 3:19:11 PM in addition to the date At this point, you have most of the tools that you need to do just about anything you want with placing data into your database and reading them However, you may want to change some values For example, suppose one of your supporters changes her name You d definitely want to make the name changes The next section shows how to change data
Changing Data with UPDATE
You may remember from 11 that the UPDATE command is used to make changes in a field To get an idea of how to work with UPDATE, start with the tools in Visual Studio The following steps will guide you through the update process:
1 Open the Server Explorer, right-click on the Supporters table, and select New Query to
open the Query window
2 Then right-click on the window to open the context menu Select Change Type | Update
as shown in Figure 12-20
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Figure 12-20
Updating a table
3 Once in the Update mode in the Query window, check the LastName column 4 In the central panel in the New Value column, type in Smith You will see N Smith
as shown in Figure 12-20
5 In the Filter column type in Jones As soon as you tab out of the column, it shows
=N Jones Those steps set up the UPDATE command you will need, but what does it mean Essentially, the settings ask, Look for the name Jones, and if you find it, change it to Smith Because the update is taking place in a single field, the new value and filter share a common field To see how this works with a web site, the update application changes the last name of any name entered It then tries to find the old last name, and if it finds it, it changes it to the new name You will see that it uses the value parameters in the same way as did the application that is used for dynamic data entry
12: ADONET: Hello Database
ASPNET Updateaspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Updateaspxcs" Inherits="Updater" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN" "http://wwww3org/TR/xhtml1/DTD/xhtml1-transitionaldtd"> <html xmlns="http://wwww3org/1999/xhtml"> <head runat="server"> <style type="text/css"> div { font-family:Arial, Helvetica, Sans-Serif; color:#005500; line-height:normal; } </style> <title>Update Last Name</title> </head> <body> <form id="form1" runat="server"> <div> <h3>Enter Your Old and New Name</h3> Old Name: <asp:TextBox ID="LName" runat="server"/><p /> New Name: <asp:TextBox ID="NewName" runat="server"/><p /> <asp:Button ID="Button1" runat="server" onclick="UpdateData" Text="Make Change" /><p /> <asp:Label ID="Label1" runat="server" Text="Status"/> </div> </form> </body> </html>
The C# portion of the application is relatively short Because only a single field is affected, less data are passed to the partial C# class As you saw, the ASPNET portion has only two data input controls, so the class requires less coding
C# Updateaspxcs
using System; using SystemDataSqlClient; public partial class Updater : SystemWebUIPage { private string strUpdate; private SqlCommand sqlCmd; private SqlConnection hookUp;
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