有关dataset，datagrid的问题.

Question

去http://chs.gotdotnet.com/quickstart/aspplus/,多的是，慢慢看吧！

Answer 1

利用DataGrid编辑、修改、删除记录
下面的这个例子提供了利用DataGrid编辑、修改、删除记录的方法，数据库字段名称和类型如下。数据库aa中表 people：People.sqlif exists (select * from dbo.sysobjects where 
id = object_id(N'[dbo].[People]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[People]
GOCREATE TABLE [dbo].[People] (
[pkID] [int] IDENTITY (1, 1) NOT NULL ,
[FirstName] [char] (100) COLLATE Chinese_PRC_CI_AS NULL ,
[LastName] [char] (100) COLLATE Chinese_PRC_CI_AS NULL 
) ON [PRIMARY]
GOEditDataGridCS.aspx<%@ Page Language="c#" debug="true"%>
<%@ Import Namespace="System.Data"%>
<%@ Import Namespace="System.Data.SqlClient" %><script runat="server">//make first sql 
String sql = "";
String strCnn = "Data Source=.;Initial Catalog=aa;User Id=sa;Password=;";
//create a datasource function
public ICollection CreateDataSource () {
SqlConnection conn = new SqlConnection(strCnn);SqlDataAdapter db_sqladaptor = new SqlDataAdapter(sql,conn);DataSet ds = new DataSet();
db_sqladaptor.Fill(ds,"MyDataResult");DataView myView = ds.Tables["MyDataResult"].DefaultView;
return myView;
}
//do page loadpublic void Page_Load(Object sender, EventArgs e) {
strCnn = "Data Source=.;Initial Catalog=aa;User Id=sa;Password=;";if (!IsPostBack) 
{
sql = "Select * FROM People";
People.DataSource = CreateDataSource();
People.DataBind();
}} public void Page_Grid(Object sender, DataGridPageChangedEventArgs e) 
{
sql = "Select * FROM People";
// Set CurrentPageIndex to the page the user clicked.
People.CurrentPageIndex = e.NewPageIndex;// Rebind the data. 
People.DataSource = CreateDataSource();
People.DataBind();}public void People_Edit(Object sender, DataGridCommandEventArgs e) 
{
sql = "Select * FROM People"; People.EditItemIndex = e.Item.ItemIndex;
People.DataSource = CreateDataSource();
People.DataBind();}public void People_Cancel(Object sender, DataGridCommandEventArgs e) 
{
sql = "Select * FROM People";
People.EditItemIndex = -1;
People.DataSource = CreateDataSource();
People.DataBind();}public void People_Update(Object sender, DataGridCommandEventArgs e) 
{
string FirstName = ((TextBox)e.Item.Cells[1].Controls[1]).Text;
string LastName = ((TextBox)e.Item.Cells[2].Controls[1]).Text;SqlConnection connUpdate = new SqlConnection(strCnn);
connUpdate.Open();
String sql_edit = "UPDATE People " +
"SET FirstName = '" + FirstName.Replace("'","''")+ "'," +
"LastName = '" + LastName.Replace("'","''")+ "'" +
" WHERE pkID = " + e.Item.Cells[0].Text;SqlCommand sqlCommandUpdate = new SqlCommand(sql_edit,connUpdate);
sqlCommandUpdate.ExecuteNonQuery();
connUpdate.Close();sql =  "Select * FROM People";
People.EditItemIndex = -1;
People.DataSource = CreateDataSource();
People.DataBind();}public void People_Delete(Object sender, DataGridCommandEventArgs e) {SqlConnection connDel = new SqlConnection(strCnn);
connDel.Open();
String sql_Del = "DELETE FROM People " +
" WHERE pkID = " + e.Item.Cells[0].Text;SqlCommand sqlCommandDel = new SqlCommand(sql_Del,connDel);
sqlCommandDel.ExecuteNonQuery();
connDel.Close();sql =  "Select * FROM People";
People.EditItemIndex = -1;
People.DataSource = CreateDataSource();
People.DataBind();}</script><font face="arial" size="3">
<b>Edit People</b>
</font>
<br><form runat="server"><asp:DataGrid id="People" runat="server"
BorderColor="green" 
Width="640" 
PageSize="5" 
AllowPaging="true" 
OnPageIndexChanged="Page_Grid" 
BorderWidth="1"
CellPadding="3"
AutoGenerateColumns="false"
ShowHeader="true" 
Visible="true" OnEditCommand="People_Edit" 
OnCancelCommand="People_Cancel" 
OnUpdateCommand="People_Update" 
OnDeleteCommand="People_Delete"><HeaderStyle BorderColor="White" BackColor="black" 
ForeColor="White" 
Font-Bold="True" 
Font-Name="Arial" 
Font-Size="9" HorizontalAlign="Center"/><ItemStyle   BorderColor="" 
BackColor="#FFFFF0" 
ForeColor="Black" 
Font-Name="Arial" 
Font-Size="8" 
Font-Bold="False" HorizontalAlign="Center"/><EditItemStyle   BorderColor="" 
BackColor="#FFFFF0" 
ForeColor="Black" 
Font-Name="Arial" 
Font-Size="7" 
Font-Bold="False" HorizontalAlign="Center"/><PagerStyle Mode="NumericPages" Font-Size="8"/><Columns><asp:BoundColumn HeaderText="ID" ReadOnly="true" DataField="pkID"/><asp:TemplateColumn><HeaderTemplate>
<b> First Name </b>
</HeaderTemplate><ItemTemplate>
<asp:Label
Text='<%# DataBinder.Eval(Container.DataItem, "FirstName").ToString().Trim() %>'
runat="server"/>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox id="FirstName" Text='
<%# DataBinder.Eval(Container.DataItem, "FirstName").ToString().Trim() %>' 
runat="server" Width="100%"/>
</EditItemTemplate></asp:TemplateColumn><asp:TemplateColumn><HeaderTemplate>
<b> Last Name </b>
</HeaderTemplate><ItemTemplate>
<asp:Label 
Width="200" 
Text='<%# DataBinder.Eval(Container.DataItem, "LastName").ToString().Trim() %>' 
runat="server"/>
</ItemTemplate><EditItemTemplate>
<asp:TextBox id="LastName" Text='<br>
<%# DataBinder.Eval(Container.DataItem, "LastName").ToString().Trim() %>' 
runat="server" Width="100%"/>
</EditItemTemplate></asp:TemplateColumn><asp:EditCommandColumn
ButtonType="LinkButton"
CancelText="Cancel"
EditText="Edit"
UpdateText="Update" /><asp:ButtonColumn Text= "Delete" CommandName="Delete"></asp:ButtonColumn> </Columns></asp:DataGrid></form>