Sorry, 'DataItem', not 'DateItem'.:)
"Laser Lu" <laser_lu@hotmail.com> wrote in message
news:%23QXK4tfQGHA.3916@TK2MSFTNGP11.phx.gbl...[color=blue]
> Thanks for your deeper look at my code:) However, I'm afraid that's also
> not the exact reason. I'm sure I had tested the code on Items that are of
> ItemType.Item/AlternativeItem. They just don't work, always return null
> DateItem. :(
>
> "Eliyahu Goldin" <removemeegoldin@monarchmed.com> wrote in message
> news:eGAlskfQGHA.5152@TK2MSFTNGP10.phx.gbl...[color=green]
>> Ok, I had another look at your code. Does you grid have a header?
>>
>> In the code
>>[color=darkred]
>>>>>>> private void dataGrid_ItemDataBound(object sender,
>>>>>>> System.Web.UI.WebControls.DataGridItemEventArgs e)
>>>>>>> {
>>>>>>> // Response.Write(e.Item.DataItem.ToString());
>>>>>>> }[/color]
>>
>> you should be checking e.Item.ItemType. DataItem is applicable only to
>> ItemType Item and AlternativeItem.
>>
>> You are likely observing DataItem=null for the Header item.
>>
>> Eliyahu
>>
>> "Laser Lu" <laser_lu@hotmail.com> wrote in message
>> news:uL2iVffQGHA.1688@TK2MSFTNGP11.phx.gbl...[color=darkred]
>>>I also did that, but the dataset and dataview both have data contained in
>>>them. The only thing that was strange is that DataItem was not set to any
>>>object reference in the code-behind. But it indeed works for inline code
>>>like <%# Container.DataItem %> in the .aspx file. So strange, I dont'
>>>know why:(
>>>
>>> "Eliyahu Goldin" <removemeegoldin@monarchmed.com> wrote in message
>>> news:OOr8TWfQGHA.3984@TK2MSFTNGP14.phx.gbl...
>>>> Sorry, missed it.
>>>>
>>>> I think the table name should be "Table1" rather than "Table". Anyway,
>>>> why don't you set a breakpoint on the line following the Fill call and
>>>> check what is in the dataset?
>>>>
>>>> Eliyahu
>>>>
>>>> "Laser Lu" <laser_lu@hotmail.com> wrote in message
>>>> news:OIfczPfQGHA.1160@TK2MSFTNGP09.phx.gbl...
>>>>>I have done that in my last code post. :) Maybe, that is not the key
>>>>>point.
>>>>>
>>>>> "Eliyahu Goldin" <removemeegoldin@monarchmed.com> wrote in message
>>>>> news:ObUpZGfQGHA.3984@TK2MSFTNGP14.phx.gbl...
>>>>>> From the MSDN Library on DataGrid.DataMember property:
>>>>>>
>>>>>> ---
>>>>>> If the DataSet or DataViewManager contains only one DataTable, you
>>>>>> should set the DataMember to the TableName of that DataTable.
>>>>>> ---
>>>>>>
>>>>>> Just try this. It doesn't hurt.
>>>>>>
>>>>>> Eliyahu
>>>>>>
>>>>>> "Laser Lu" <laser_lu@hotmail.com> wrote in message
>>>>>> news:%234fL3BfQGHA.4344@TK2MSFTNGP12.phx.gbl...
>>>>>>>I suppose, there is no need to explicity set the DataMember, if there
>>>>>>>is only one DataTable exists in the DataSet. The control will
>>>>>>>automaitcally find the first DataTable to bind. The previous code I
>>>>>>>posted withou specifying DataMember worked fine in my computer:)
>>>>>>>
>>>>>>> Additionally, I've just followed what you have mentioned, accessing
>>>>>>> the DataItem property in item-related events, both ItemCreated and
>>>>>>> ItemDataBound. But they still doesn't work, keeping throwing
>>>>>>> NullReferenceExceptions in both event handlers. :(
>>>>>>>
>>>>>>> What a pity! I don't know what to do. It really frustrated me! Help,
>>>>>>> please!
>>>>>>>
>>>>>>> BTW: the whole program for Text.aspx was posted below, and just for
>>>>>>> your information:
>>>>>>>
>>>>>>> /// Test.aspx
>>>>>>> <%@ Page language="c#" Codebehind="Test.aspx.cs"
>>>>>>> AutoEventWireup="false" Inherits="CEIS.Test" %>
>>>>>>> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
>>>>>>> <HTML>
>>>>>>> <HEAD>
>>>>>>> <title>Test</title>
>>>>>>> <meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
>>>>>>> <meta content="C#" name="CODE_LANGUAGE">
>>>>>>> <meta content="JavaScript" name="vs_defaultClientScript">
>>>>>>> <meta content="http://schemas.microsoft.com/intellisense/ie5"
>>>>>>> name="vs_targetSchema">
>>>>>>> </HEAD>
>>>>>>> <body>
>>>>>>> <form id="Form1" method="post" runat="server">
>>>>>>> <asp:datagrid id="dataGrid" runat="server"></asp:datagrid></form>
>>>>>>> </body>
>>>>>>> </HTML>
>>>>>>>
>>>>>>> /// Test.aspx.cs
>>>>>>> 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;
>>>>>>>
>>>>>>> namespace CEIS
>>>>>>> {
>>>>>>> /// <summary>
>>>>>>> /// Summary description for Test.
>>>>>>> /// </summary>
>>>>>>> public class Test : System.Web.UI.Page
>>>>>>> {
>>>>>>> protected System.Data.SqlClient.SqlConnection testConnection;
>>>>>>> protected System.Data.SqlClient.SqlCommand sqlSelectCommand1;
>>>>>>> protected System.Data.SqlClient.SqlCommand sqlInsertCommand1;
>>>>>>> protected System.Data.SqlClient.SqlCommand sqlUpdateCommand1;
>>>>>>> protected System.Data.SqlClient.SqlCommand sqlDeleteCommand1;
>>>>>>> protected System.Data.SqlClient.SqlDataAdapter testAdapter;
>>>>>>> protected System.Data.DataSet dataSet;
>>>>>>> protected System.Web.UI.WebControls.DataGrid dataGrid;
>>>>>>>
>>>>>>> private void Page_Load(object sender, System.EventArgs e)
>>>>>>> {
>>>>>>> // Put user code to initialize the page here
>>>>>>> testAdapter.Fill(dataSet);
>>>>>>> dataGrid.DataMember = "Table";
>>>>>>> dataGrid.DataSource = dataSet;
>>>>>>> dataGrid.DataBind();
>>>>>>>
>>>>>>> // Response.Write(dataGrid.Items[0].DataItem.ToString());
>>>>>>> }
>>>>>>>
>>>>>>> #region Web Form Designer generated code
>>>>>>> override protected void OnInit(EventArgs e)
>>>>>>> {
>>>>>>> //
>>>>>>> // CODEGEN: This call is required by the ASP.NET Web Form
>>>>>>> Designer.
>>>>>>> //
>>>>>>> InitializeComponent();
>>>>>>> base.OnInit(e);
>>>>>>> }
>>>>>>>
>>>>>>> /// <summary>
>>>>>>> /// Required method for Designer support - do not modify
>>>>>>> /// the contents of this method with the code editor.
>>>>>>> /// </summary>
>>>>>>> private void InitializeComponent()
>>>>>>> {
>>>>>>> System.Configuration.AppSettingsReader configurationAppSettings =
>>>>>>> new System.Configuration.AppSettingsReader();
>>>>>>> this.testConnection = new System.Data.SqlClient.SqlConnection();
>>>>>>> this.sqlSelectCommand1 = new System.Data.SqlClient.SqlCommand();
>>>>>>> this.sqlInsertCommand1 = new System.Data.SqlClient.SqlCommand();
>>>>>>> this.sqlUpdateCommand1 = new System.Data.SqlClient.SqlCommand();
>>>>>>> this.sqlDeleteCommand1 = new System.Data.SqlClient.SqlCommand();
>>>>>>> this.testAdapter = new System.Data.SqlClient.SqlDataAdapter();
>>>>>>> this.dataSet = new System.Data.DataSet();
>>>>>>>
>>>>>>> ((System.ComponentModel.ISupportInitialize)(this.d ataSet)).BeginInit();
>>>>>>> this.dataGrid.ItemCreated += new
>>>>>>> System.Web.UI.WebControls.DataGridItemEventHandler (this.dataGrid_ItemCreated);
>>>>>>> this.dataGrid.ItemDataBound += new
>>>>>>> System.Web.UI.WebControls.DataGridItemEventHandler (this.dataGrid_ItemDataBound);
>>>>>>> //
>>>>>>> // testConnection
>>>>>>> //
>>>>>>> this.testConnection.ConnectionString =
>>>>>>> ((string)(configurationAppSettings.GetValue("testC onnection.ConnectionString",
>>>>>>> typeof(string))));
>>>>>>> //
>>>>>>> // sqlSelectCommand1
>>>>>>> //
>>>>>>> this.sqlSelectCommand1.CommandText = "SELECT Customers.* FROM
>>>>>>> Customers";
>>>>>>> this.sqlSelectCommand1.Connection = this.testConnection;
>>>>>>> //
>>>>>>> // testAdapter
>>>>>>> //
>>>>>>> this.testAdapter.DeleteCommand = this.sqlDeleteCommand1;
>>>>>>> this.testAdapter.InsertCommand = this.sqlInsertCommand1;
>>>>>>> this.testAdapter.SelectCommand = this.sqlSelectCommand1;
>>>>>>> this.testAdapter.UpdateCommand = this.sqlUpdateCommand1;
>>>>>>> //
>>>>>>> // dataSet
>>>>>>> //
>>>>>>> this.dataSet.DataSetName = "testDataSet";
>>>>>>> this.dataSet.Locale = new
>>>>>>> System.Globalization.CultureInfo("en-US");
>>>>>>> this.Load += new System.EventHandler(this.Page_Load);
>>>>>>>
>>>>>>> ((System.ComponentModel.ISupportInitialize)(this.d ataSet)).EndInit();
>>>>>>>
>>>>>>> }
>>>>>>> #endregion
>>>>>>>
>>>>>>> private void dataGrid_ItemCreated(object sender,
>>>>>>> System.Web.UI.WebControls.DataGridItemEventArgs e)
>>>>>>> {
>>>>>>> // Response.Write(e.Item.DataItem.ToString());
>>>>>>> }
>>>>>>>
>>>>>>> private void dataGrid_ItemDataBound(object sender,
>>>>>>> System.Web.UI.WebControls.DataGridItemEventArgs e)
>>>>>>> {
>>>>>>> // Response.Write(e.Item.DataItem.ToString());
>>>>>>> }
>>>>>>> }
>>>>>>> }
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> "Eliyahu Goldin" <removemeegoldin@monarchmed.com> wrote in message
>>>>>>> news:ORhsjUeQGHA.1728@TK2MSFTNGP11.phx.gbl...
>>>>>>>> Do you set DataMember property? You have to set it to the name of a
>>>>>>>> table in your dataset.
>>>>>>>>
>>>>>>>> In what part of you code do you refer to
>>>>>>>> dataGrid.Items[0].DataItem? Typically, it should be in one of the
>>>>>>>> item-related events, like ItemDataBound or ItemCreated.
>>>>>>>>
>>>>>>>> If it is not enough, post the relevant part of the .aspx file.
>>>>>>>> Don't sent attachments.
>>>>>>>>
>>>>>>>> Eliyahu
>>>>>>>>
>>>>>>>> "Laser Lu" <laser_lu@hotmail.com> wrote in message
>>>>>>>> news:e5dnfqdQGHA.648@TK2MSFTNGP14.phx.gbl...
>>>>>>>>> And the .aspx file and .cs file is provided in the attachment for
>>>>>>>>> your convenience, if necessary. :)
>>>>>>>>>
>>>>>>>>> "Laser Lu" <laser_lu@hotmail.com> wrote in message
>>>>>>>>> news:%23J9MRldQGHA.3896@TK2MSFTNGP15.phx.gbl...
>>>>>>>>>> Thanks for your response. Here is the code fragment:
>>>>>>>>>>
>>>>>>>>>> private void Page_Load(object sender, System.EventArgs e)
>>>>>>>>>> {
>>>>>>>>>> // Put user code to initialize the page here
>>>>>>>>>> testAdapter.Fill(dataSet);
>>>>>>>>>> dataGrid.DataSource = dataSet;
>>>>>>>>>> dataGrid.DataBind();
>>>>>>>>>>
>>>>>>>>>> Response.Write(dataGrid.Items[0].DataItem.ToString()); // A
>>>>>>>>>> NullReferenceException will be thrown here!
>>>>>>>>>> }
>>>>>>>>>>
>>>>>>>>>> The testAdapter executes an SelectCommand as 'select * from
>>>>>>>>>> Customers' on
>>>>>>>>>> the Northwind database. Actually, dozens of rows was returned
>>>>>>>>>> from the
>>>>>>>>>> database. However, when I tried to print out the
>>>>>>>>>> DataItem.ToString() using
>>>>>>>>>> Response.Write(), a NullReferenceException occured. But it works
>>>>>>>>>> fine, after
>>>>>>>>>> I had commented that line of code.
>>>>>>>>>> I don't know whether I wrote the code in the correct way, would
>>>>>>>>>> you please
>>>>>>>>>> point me out? Thanks:)
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> "Eliyahu Goldin" <removemeegoldin@monarchmed.com> wrote in
>>>>>>>>>> message
>>>>>>>>>> news:%23y3c4NdQGHA.5152@TK2MSFTNGP10.phx.gbl...
>>>>>>>>>>> There is no difference where the code is.
>>>>>>>>>>>
>>>>>>>>>>> Post the relevant fragment from the code and the .aspx file,
>>>>>>>>>>> likely there
>>>>>>>>>>> is a problem over there.
>>>>>>>>>>>
>>>>>>>>>>> Eliyahu
>>>>>>>>>>>
>>>>>>>>>>> "Laser Lu" <laser_lu@hotmail.com> wrote in message
>>>>>>>>>>> news:u2pG8FdQGHA.516@TK2MSFTNGP15.phx.gbl...
>>>>>>>>>>>> Hi, all,
>>>>>>>>>>>> I was tangled by the DataGridItem.DataItem property. I tried
>>>>>>>>>>>> to invoke
>>>>>>>>>>>> that property to get and display the contents that was bound to
>>>>>>>>>>>> the
>>>>>>>>>>>> currently selected row. However, an exception surprised me that
>>>>>>>>>>>> it said
>>>>>>>>>>>> "Object reference not set to an instance of an object." How
>>>>>>>>>>>> could it
>>>>>>>>>>>> happen? I have set the data source, and called the DataBind().
>>>>>>>>>>>> I looked up the MSDN documents, and just find some
>>>>>>>>>>>> inessential
>>>>>>>>>>>> descriptions, and a code example. I didn't try that example by
>>>>>>>>>>>> myself,
>>>>>>>>>>>> but I noticed a difference that, the example uses the
>>>>>>>>>>>> single-file code
>>>>>>>>>>>> (i.e code was written in the .aspx file) while I wrote my code
>>>>>>>>>>>> in the
>>>>>>>>>>>> code-behind mode. So I wonder if this is the reason? But I'm
>>>>>>>>>>>> afraid I
>>>>>>>>>>>> would be puzzled if MS says the DataItem property will not be
>>>>>>>>>>>> available
>>>>>>>>>>>> through code-behind:)
>>>>>>>>>>>> Any help, please?
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>
>>>[/color]
>>
>>[/color]
>
>[/color]
