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DataGrid Problem

I am trying display the contents of a table in a web page, select
certain rows from that table and then display the fields that I have
selected (now table columns) as text in a Label object. Amazingly I have
managed to display the table - no problem, I can select rows - no
problem, BUT I can't work out how to display more than one of the fields
(now columns in the table in the web page). I can display one field OK,
but not more than one field and its driving me bonkers. All of my
confusion is related to how you reference a DataKeyField in a DataGrid.

The two fields that I am selecting are ID and a Customer taken from the
SQL

SELECT Field_ID as ID, Field_Customer as Customer FROM Table_Customer

I've worked out that the DataGrid DataKeys property (if it is a
property) controls which field is passed to the the instance of the
DataGrid so

<asp:datagrid id="DemoGrid" runat="server" DataKeyField="c ustomer"
Font-Size="XX-Small">

and then

gridSelections. AppendFormat("{ 0} ",

DemoGrid.DataKe ys[DemoGridItem.It emIndex].ToString());

will result in the customer field being in the result

and if I change the DataKeyField to id then

<asp:datagrid id="DemoGrid" runat="server" DataKeyField="i d"
Font-Size="XX-Small">

will result the id field being in the result of

gridSelections. AppendFormat("{ 0} ",

DemoGrid.DataKe ys[DemoGridItem.It emIndex].ToString());

Thing is I want both customer and id to be in the result.

There that is my problem (well the real problem is lack of knowledge of
DataGrids and C# in general - but thats my problem).

I hope the question makes sense and if I have offended anyone with the
question I apologize but suggest you try to take it easy.

Here's the complete c# code behind the scene and also the HTML code of
the web form.

Other than begging and pleading HELP , I would be very grateful if
someone could shine light upon the darkness of my ignorance.

WebForm1.aspx.c s
=============== =

using System;
using System.Collecti ons;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.Sess ionState;
using System.Web.UI;
using System.Web.UI.W ebControls;
using System.Web.UI.H tmlControls;
using System.Data.Sql Client;
using System.Text;

namespace WebApplication1

{

/// <summary>
/// Summary description for WebForm1.
/// </summary>

public class WebForm1 : System.Web.UI.P age
{
protected System.Web.UI.W ebControls.Data Grid DemoGrid;
protected System.Web.UI.W ebControls.Labe l ResultsInfo;
protected System.Web.UI.W ebControls.Butt on GetSelections;

private void Page_Load(objec t sender, System.EventArg s e)
{
if(!IsPostBack)
{
//Create a SqlConnection object.
//Modify the connection string as necessary for your environment.
SqlConnection cn = new
SqlConnection(" Server=MyServer ;database=MyDat abase;UID=sa;PW D=MyPassword
");
SqlCommand cmd = new SqlCommand("SEL ECT Field_ID as ID, Field_Customer
as Customer FROM Table_Customer" ,cn);
cn.Open();
SqlDataReader reader = cmd.ExecuteRead er();
DemoGrid.DataSo urce = reader;

DataBind();
reader.Close();
cn.Close();
}
}

#region Web Form Designer generated code
override protected void OnInit(EventArg s e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeCompo nent();
base.OnInit(e);
}

/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeCompo nent()
{
this.DemoGrid.S electedIndexCha nged += new
System.EventHan dler(this.DemoG rid_SelectedInd exChanged);
this.GetSelecti ons.Click += new
System.EventHan dler(this.GetSe lections_Click) ;
this.Load += new System.EventHan dler(this.Page_ Load);
}

#endregion
private void GetSelections_C lick(object sender, System.EventArg s e)
{
int rowCount = 0;
StringBuilder gridSelections = new StringBuilder() ;
//Loop through each DataGridItem, and determine which CheckBox controls
//have been selected.
foreach(DataGri dItem DemoGridItem in DemoGrid.Items)
{
CheckBox myCheckbox = (CheckBox)DemoG ridItem.Cells[0].Controls[1];
if(myCheckbox.C hecked == true)
{
rowCount++;
gridSelections. AppendFormat("{ 0} ",
DemoGrid.DataKe ys[DemoGridItem.It emIndex].ToString());

ListBox myListBox = (ListBox)DemoGr idItem.Cells[1].Controls[1];
gridSelections. AppendFormat( " " +
myListBox.Selec tedItem.Text.To String()+ " <br>");
}
} gridSelections. Append("<hr>");

gridSelections. AppendFormat("T otal number selected is: {0}",
rowCount.ToStri ng());

ResultsInfo.Tex t = gridSelections. ToString();
}
private void DemoGrid_Select edIndexChanged( object sender,
System.EventArg s e)
{
}

public SqlDataReader GetReportNames ()
{

//Polulates the list box for report names
SqlConnection conn = new SqlConnection(" server=MyServer ; uid=sa;
pwd=MyPassword; Database=MyData base");
String sqlConnection = "select Report, Name from TableReports";
SqlCommand sqlCommand = new SqlCommand(sqlC onnection, conn);
conn.Open();
SqlDataReader sqlDataReader;
sqlDataReader = sqlCommand.Exec uteReader();
return sqlDataReader;
sqlDataReader.C lose();
conn.Close();
}
}
}
HTML WebForm
============

<%@ Page language="c#" Codebehind="Web Form1.aspx.cs"
AutoEventWireup ="false" Inherits="WebAp plication1.WebF orm1" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm1 </title>
<meta content="Micros oft Visual Studio .NET 7.1" name="GENERATOR ">
<meta content="C#" name="CODE_LANG UAGE">
<meta content="_JavaS cript" name="vs_defaul tClientScript">
<meta content="http://schemas.microso ft.com/intellisense/ie5"
name="vs_target Schema">
</HEAD>
<body MS_POSITIONING= "GridLayout ">
<form id="Form1" method="post" runat="server">
<asp:label id="ResultsInfo " style="Z-INDEX: 103; LEFT: 472px;
POSITION: absolute; TOP: 112px"
runat="server" Width="304px" Height="112px"> </asp:label>
<asp:datagrid id="DemoGrid" runat="server" DataKeyField="c ustomer"
Font-Size="XX-Small">
<Columns>
<asp:TemplateCo lumn HeaderText="Run ">
<ItemTemplate >
<asp:CheckBox ID="myCheckbox " Runat="server" />
</ItemTemplate>
</asp:TemplateCol umn>
<asp:TemplateCo lumn HeaderText="Rep ort">
<ItemTemplate >
<asp:ListBox ID="myListbox" Rows="1" Width="150px"
SelectionMode=" Single" Runat="server"
DataSource = "<%# GetReportNames( ) %>"
DataTextField=" ReportName" DataValueField= "Report" />
</ItemTemplate>
</asp:TemplateCol umn>
</Columns>
</asp:datagrid><a sp:button id="GetSelectio ns" style="Z-INDEX: 102;
LEFT: 472px; POSITION: absolute; TOP: 24px"
runat="server" Text="Build Request"
Width="152px"></asp:button></form>
</body>
</HTML>

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Nov 16 '05 #1
1 2522
Joe,

Here is a way that you can read the contents of cells from a datagrid. This assumes that you are displaying the data in TextBoxes. You would have to adjust the code if you are using a different type of control or not control at all. I hope this helps. Cheers, Danny!
string categoryName;
string categoryDescrip tion;
TextBox tb;
tb = (TextBox) e.Item.Cells[2].Controls[0];
categoryName = tb.Text;
tb = (TextBox) e.Item.Cells[3].Controls[0];
categoryDescrip tion = tb.Text

Nov 16 '05 #2

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