Gets or sets the specific data member in a multimember data source to bind to a data listing control.
(in System.Web.dll)
Visual Basic (Declaration)
<ThemeableAttribute(False)> _
Public Property DataMember As String
Dim instance As BaseDataList
Dim value As String
value = instance.DataMember
instance.DataMember = value
[ThemeableAttribute(false)]
public string DataMember { get; set; }
[ThemeableAttribute(false)]
public:
property String^ DataMember {
String^ get ();
void set (String^ value);
}
public function get DataMember () : String
public function set DataMember (value : String)
<asp:BaseDataList DataMember="String" />
Use the DataMember property to specify a member from a multimember data source to bind to the list control. For example, if you have a data source with more than one table specified in the DataSource property, use the DataMember property to specify which table to bind to a data listing control.
This property cannot be set by themes or style sheet themes. For more information, see ThemeableAttribute and ASP.NET Themes and Skins Overview.
The following code example demonstrates how to use the DataMember property to specify which table in a DataSet object to bind to a DataGrid control.
<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Import Namespace = "System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html >
<head runat="server">
<title> BaseDataList DataMember Example </title>
<script runat="server">
' Create sample data for the DataGrid control with two tables,
' Employee and Customer.
Function CreateDataSet() As DataSet
' Create a table to store employee values.
Dim EmployeeTable As DataTable = New DataTable("Employee")
Dim TempDataRow As DataRow
' Define the columns for the Employee table.
EmployeeTable.Columns.Add( _
New DataColumn("EmployeeName", GetType(String)))
EmployeeTable.Columns.Add( _
New DataColumn("EmployeeID", GetType(Integer)))
' Populate the Employee table.
Dim i As Integer
For i=1 To 5
TempDataRow = EmployeeTable.NewRow()
TempDataRow(0) = "Employee " & i.ToString()
TempDataRow(1) = (i+1700)
EmployeeTable.Rows.Add(TempDataRow)
Next
' Create a table to store customer values.
Dim CustomerTable As DataTable = New DataTable("Customer")
' Define the columns for the Customer table.
CustomerTable.Columns.Add( _
New DataColumn("CustomerName", GetType(String)))
CustomerTable.Columns.Add( _
New DataColumn("CustomerID", GetType(Integer)))
' Populate the Customer table.
For i=1 To 5
TempDataRow = CustomerTable.NewRow()
TempDataRow(0) = "Customer " & i.ToString()
TempDataRow(1) = (i+1700)
CustomerTable.Rows.Add(TempDataRow)
Next
' Create a DataSet and add the Employee and Customer tables.
Dim ds As DataSet = New DataSet()
ds.Tables.Add(EmployeeTable)
ds.Tables.Add(CustomerTable)
Return ds
End Function
Sub Page_Load(sender As Object, e As EventArgs)
' The data source only needs to be bound to the DataList
' control the first time the page is accessed.
If Not IsPostBack Then
' Create the sample data for the DataList control.
ItemsGrid.DataSource = CreateDataSet()
' The data source in this example contains multiple tables.
' Specify which table to display in the DataList control.
ItemsGrid.DataMember = "Customer"
' Bind the data source to the control.
ItemsGrid.DataBind()
End If
End Sub
Sub Index_Change(sender As Object, e As EventArgs)
' Create the sample data for the DataList control.
ItemsGrid.DataSource = CreateDataSet()
' The data source in this example contains multiple tables.
' Specify which table to display in the DataList control
' based on the user's selection from the DropDownList control.
ItemsGrid.DataMember = SourceList.SelectedItem.Text
' Bind the data source to the control.
ItemsGrid.DataBind()
End Sub
</script>
</head>
<body>
<form id="form1" runat="server">
<h3> BaseDataList DataMember Example </h3>
<asp:DataGrid id="ItemsGrid"
AutoGenerateColumns="True"
runat="server">
<headerstyle backcolor="#00aaaa"/>
</asp:DataGrid>
<br /><br />
Select the data source: <br />
<asp:DropDownList id="SourceList"
AutoPostBack="True"
OnSelectedIndexChanged="Index_Change"
runat="server">
<asp:Listitem Selected="True">Customer</asp:Listitem>
<asp:Listitem>Employee</asp:Listitem>
</asp:DropDownList>
</form>
</body>
</html>
<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace = "System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html >
<head runat="server">
<title> BaseDataList DataMember Example </title>
<script runat="server">
// Create sample data for the DataGrid control with two tables,
// Employee and Customer.
DataSet CreateDataSet()
{
// Create a table to store employee values.
DataTable EmployeeTable = new DataTable("Employee");
DataRow TempDataRow;
// Define the columns for the Employee table.
EmployeeTable.Columns.Add(
new DataColumn("EmployeeName", typeof(string)));
EmployeeTable.Columns.Add(
new DataColumn("EmployeeID", typeof(int)));
// Populate the Employee table.
for (int i=1; i<=5; i++)
{
TempDataRow = EmployeeTable.NewRow();
TempDataRow[0] = "Employee " + i.ToString();
TempDataRow[1] = (i+1700);
EmployeeTable.Rows.Add(TempDataRow);
}
// Create a table to store customer values.
DataTable CustomerTable = new DataTable("Customer");
// Define the columns for the Customer table.
CustomerTable.Columns.Add(
new DataColumn("CustomerName", typeof(string)));
CustomerTable.Columns.Add(
new DataColumn("CustomerID", typeof(int)));
// Populate the Customer table.
for (int i=1; i<=5; i++)
{
TempDataRow = CustomerTable.NewRow();
TempDataRow[0] = "Customer " + i.ToString();
TempDataRow[1] = (i+1700);
CustomerTable.Rows.Add(TempDataRow);
}
// Create a DataSet and add the Employee and Customer tables.
DataSet ds = new DataSet();
ds.Tables.Add(EmployeeTable);
ds.Tables.Add(CustomerTable);
return ds;
}
void Page_Load(Object sender, EventArgs e)
{
// The data source only needs to be bound to the DataList
// control the first time the page is accessed.
if(!IsPostBack)
{
// Create the sample data for the DataList control.
ItemsGrid.DataSource = CreateDataSet();
// The data source in this example contains multiple tables.
// Specify which table to display in the DataList control.
ItemsGrid.DataMember = "Customer";
// Bind the data source to the control.
ItemsGrid.DataBind();
}
}
void Index_Change(Object sender, EventArgs e)
{
// Create the sample data for the DataList control.
ItemsGrid.DataSource = CreateDataSet();
// The data source in this example contains multiple tables.
// Specify which table to display in the DataList control
// based on the user's selection from the DropDownList control.
ItemsGrid.DataMember = SourceList.SelectedItem.Text;
// Bind the data source to the control.
ItemsGrid.DataBind();
}
</script>
</head>
<body>
<form id="form1" runat="server">
<h3> BaseDataList DataMember Example </h3>
<asp:DataGrid id="ItemsGrid"
AutoGenerateColumns="True"
runat="server">
<headerstyle backcolor="#00aaaa"/>
</asp:DataGrid>
<br /><br />
Select the data source: <br />
<asp:DropDownList id="SourceList"
AutoPostBack="True"
OnSelectedIndexChanged="Index_Change"
runat="server">
<asp:Listitem Selected="True">Customer</asp:Listitem>
<asp:Listitem>Employee</asp:Listitem>
</asp:DropDownList>
</form>
</body>
</html>
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
.NET Framework
Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
Reference