<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs"
Inherits="Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Fill Load Options</title>
</head>
<body>
<div id="pageContent">
<form id="form1" runat="server">
<div>
<table>
<tr>
<td><b> </b></td>
<td><b>ORIGINAL</b></td>
<td><b>CURRENT</b></td>
</tr>
<tr>
<td><b>BEFORE</b></td>
<td>
<asp:Label runat="server" ID="BeforeLoadOrig" text="Michela" />
</td>
<td>
<asp:Label runat="server" ID="BeforeLoadCurr" text="Sylvia" />
</td>
</tr>
<tr>
<td><b>AFTER</b></td>
<td>
<asp:Label runat="server" ID="AfterLoadOrig" />
</td>
<td>
<asp:Label runat="server" ID="AfterLoadCurr" />
</td>
</tr>
</table>
<br /><br />
<asp:DropDownList ID="LoadOptionList" runat="server" AutoPostBack="True" OnSelectedIndexChanged="LoadOptions_SelectedIndexChanged">
<asp:ListItem>PreserveChanges</asp:ListItem>
<asp:ListItem>OverwriteChanges</asp:ListItem>
<asp:ListItem>Upsert</asp:ListItem>
</asp:DropDownList>
<asp:Button ID="RefreshButton" runat="server" Text="Load" OnClick="RefreshButton_Click" />
<hr />
</div>
</form>
</div>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Default : System.Web.UI.Page
{
private DataSet _data;
private string SelectCmd = "SELECT employeeid, firstname, lastname FROM employees";
private void InitDataSet()
{
_data = new DataSet();
SqlDataAdapter adapter = new SqlDataAdapter(SelectCmd,ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString);
adapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;
adapter.Fill(_data);
DataTable t = _data.Tables[0];
DataRow r = t.Rows[0];
r["firstname"] = "Michela";
r.AcceptChanges();
t = _data.Tables[0];
r = t.Rows[0];
r["firstname"] = "Sylvia";
}
protected void RefreshButton_Click(object sender, EventArgs e)
{
InitDataSet();
DataRow row = _data.Tables[0].Rows[0];
BeforeLoadOrig.Text = row["firstname", DataRowVersion.Original].ToString();
BeforeLoadCurr.Text = row["firstname", DataRowVersion.Current].ToString();
SqlDataAdapter adapter = new SqlDataAdapter(
SelectCmd,
ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString);
adapter.FillLoadOption = (LoadOption)Enum.Parse(typeof(LoadOption), LoadOptionList.SelectedValue);
adapter.Fill(_data);
AfterLoadOrig.Text = row["firstname", DataRowVersion.Original].ToString();
AfterLoadCurr.Text = row["firstname", DataRowVersion.Current].ToString();
}
protected void LoadOptions_SelectedIndexChanged(object sender, EventArgs e)
{
AfterLoadOrig.Text = "";
AfterLoadCurr.Text = "";
}
}