几天没解决了，再开一帖，希望大家关注（DATAGRID问题）

http://community.csdn.net/Expert/topic/3548/3548550.xml?temp=.9443628
当我点击“编辑”后， Dropdownlist2 默认是数据库的第一项，有没有办法点击“编辑”后 Dropdownlist2 的默认项是 id=Label1 的值。++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
》》》》前台 <asp:TemplateColumn HeaderText="类别名">

<ItemTemplate>
<asp:Label id=Label1 runat="server" Text='<%# Container.DataItem("类别名") %>'></asp:Label>
</ItemTemplate>

<EditItemTemplate>
<asp:DropDownList id="Dropdownlist2" runat="server"></asp:DropDownList>
        </EditItemTemplate> </asp:TemplateColumn>=============================================================================
》》》》》》后台。Public Sub myDataGrid_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs)        Conn = New SqlConnection(mysqlDB)        Conn.Open()        Dim SQL = "Select * From 新闻类别"
        Adpt = New SqlDataAdapter(SQL, Conn)        Ds = New DataSet
        Adpt.Fill(Ds, "新闻类别")
        If e.Item.ItemType = ListItemType.EditItem Then            Dim tempobj As DropDownList = CType(e.Item.FindControl("Dropdownlist2"), DropDownList)            tempobj.DataSource = Ds.Tables("新闻类别")
            tempobj.DataTextField = Ds.Tables("新闻类别").Columns("类别名").ToString()
            tempobj.DataValueField = Ds.Tables("新闻类别").Columns("编号").ToString()
            tempobj.DataBind()        End If
        Conn.Close()
    End Sub‘-------------------------------------------------------------------
Sub EditData(ByVal sender As Object, ByVal e As DataGridCommandEventArgs)
        '点击编辑

            MyDataGrid.EditItemIndex = e.Item.ItemIndex            OpenDataBase_And_BindToDataGrid()

    End Sub

解决方案 »

免费领取超大流量手机卡，每月29元包185G流量+100分钟通话, 中国电信官方发货

tempobj.DataBind()string gid = ((Label)e.Item.FindControl("label")).Text;tempobj.Items.FindByValue(gid).Selected = true;
你的问题在于，你试图在ItemDataBound里面来获取模板列里面的控件
这个是不能实现的参考这个帖子http://community.csdn.net/Expert/topic/3462/3462558.xml?temp=9.270877E-02
Dropdownlist2.selectedvalue=你的ＩＤ
当然你的下拉的Value的值邦定的是ＩＤ
你应该这样
If e.Item.ItemType = ListItemType.EditItem Then            Dim tempobj As DropDownList = CType(e.Item.FindControl("Dropdownlist2"), DropDownList)            tempobj.DataSource = Ds.Tables("新闻类别")
            tempobj.DataTextField = Ds.Tables("新闻类别").Columns("类别名").ToString()
            tempobj.DataValueField = Ds.Tables("新闻类别").Columns("编号").ToString()
            tempobj.DataBind()//下面是C#语法
DataRowView drv = (DataRowView)e.Item.DataItem;
ListItem item = tempobj.Items.FindByText(drv["类别名"].ToString());
if(item != null)
   item.Selected = true;        End If
<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="csdnTest.WebForm1" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm1</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<FONT face="宋体">
<asp:DataGrid id="DataGrid1" style="Z-INDEX: 101; LEFT: 224px; POSITION: absolute; TOP: 112px"
runat="server" AutoGenerateColumns="False" Width="264px">
<Columns>
<asp:BoundColumn DataField="ID" HeaderText="ID"></asp:BoundColumn>
<asp:TemplateColumn HeaderText="xx">
<ItemTemplate>
<asp:Label id=Label1 runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.name") %>'>
</asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList id="DropDownList1" runat="server"></asp:DropDownList>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:EditCommandColumn ButtonType="LinkButton" UpdateText="更新" CancelText="取消" EditText="编辑"></asp:EditCommandColumn>
</Columns>
</asp:DataGrid></FONT>
</form>
</body>
</HTML>
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Runtime.Serialization.Formatters.Soap;
namespace csdnTest
{
/// <summary>
/// WebForm1 的摘要说明。
/// </summary>
public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DataGrid DataGrid1;

private void Page_Load(object sender, System.EventArgs e)
{
if(!Page.IsPostBack)
{
DataTable dt = new DataTable();
dt.Columns.Add("ID");
dt.Columns.Add("NAME");
DataRow dr  = dt.NewRow();
dr["ID"] = 1;
dr["NAME"] = "jason";
dt.Rows.Add(dr);
this.DataGrid1.DataSource = dt;
this.DataGrid1.DataBind();
}
} #region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.DataGrid1.EditCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_EditCommand);
this.DataGrid1.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemDataBound);
this.Load += new System.EventHandler(this.Page_Load); }
#endregion private void DataGrid1_EditCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
this.DataGrid1.EditItemIndex = e.Item.ItemIndex;

DataTable dt = new DataTable();
dt.Columns.Add("ID");
dt.Columns.Add("NAME");
DataRow dr  = dt.NewRow();
dr["ID"] = 1;
dr["NAME"] = "jason";
dt.Rows.Add(dr);
this.DataGrid1.DataSource = dt;
this.DataGrid1.DataBind();
} private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
if(e.Item.ItemType == ListItemType.EditItem)
{
DropDownList ddl = (DropDownList)e.Item.FindControl("DropDownList1");
DataTable dt = new DataTable();
dt.Columns.Add("ID");
dt.Columns.Add("NAME");
DataRow dr  = dt.NewRow();
dr["ID"] = 1;
dr["NAME"] = "xxx";
dt.Rows.Add(dr);
dr  = dt.NewRow();
dr["ID"] = 1;
dr["NAME"] = "jason";
dt.Rows.Add(dr);
ddl.DataSource = dt;
ddl.DataTextField = "NAME";
ddl.DataBind();
DataRowView drv = (DataRowView)e.Item.DataItem;
ddl.Items.FindByText(drv["NAME"].ToString()).Selected = true;

}
} }
}
TO: cnhgj(戏子) (极度(╭∩╮(︶︿︶)╭∩╮)B4不结贴者)未将对象引用设置到对象的实例。
当然发现不了Label1了，因为当一行处于编辑状态的时候，ItemTempLate里面的模板是不生成的楼主尝试了4楼的方法没有？你直接把5，6楼的代码建立一个aspx来运行运行
就知道了
请问 brightheroes(闭关|那一剑的风情)if(item != null)
   item.Selected = true;        End If
是什么意思,我不理解，转vb.net怎么写。
就是
if not item is nothing
   item.Selected = true;
十分感谢  brightheroes(闭关|那一剑的风情)
已经搞定了
去我这里看看
刚写了一个小总结
http://blog.csdn.net/brightheroes/archive/2004/11/13/180201.aspx