ButtonColumn.DataTextField Property

Reference

Definition

Namespace:: System.Web.UI.WebControls

Assembly:: System.Web.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Gets or sets the field name from a data source to bind to the ButtonColumn object.

public:
 virtual property System::String ^ DataTextField { System::String ^ get(); void set(System::String ^ value); };

public virtual string DataTextField { get; set; }

member this.DataTextField : string with get, set

Public Overridable Property DataTextField As String

Property Value

String

The field name to bind to the ButtonColumn. The default is an empty string ("").

Examples

The following code example demonstrates how to use the DataTextField property to bind the ButtonColumn object to a field in a data source.

<%@ 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 xmlns="http://www.w3.org/1999/xhtml" >
   <script language="c#" runat="server">
 
      ICollection CreateDataSource() 
      {
         DataTable dt = new DataTable();
         DataRow dr;
 
         dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
         dt.Columns.Add(new DataColumn("StringValue", typeof(string)));
         dt.Columns.Add(new DataColumn("CurrencyValue", typeof(double)));
 
         for (int i = 0; i < 9; i++) 
         {
            dr = dt.NewRow();
 
            dr[0] = i;
            dr[1] = "Item " + i.ToString();
            dr[2] = 1.23 * (i + 1);
 
            dt.Rows.Add(dr);
         }
 
         DataView dv = new DataView(dt);
         return dv;
      }
 
      void Page_Load(Object sender, EventArgs e) 
      {
         if (!IsPostBack) 
         {
            // Load this data only once.
            ItemsGrid.DataSource= CreateDataSource();
            ItemsGrid.DataBind();
         }
      }
 
      void Grid_CartCommand(Object sender, DataGridCommandEventArgs e) 
      {
         
         // e.Item is the table row where the command is raised.
         // For bound columns, the value is stored in the Text property of the TableCell.
         Label1.Text = "You selected: " + e.Item.Cells[0].Text + ".";        
 
      }
 
   </script>
 
<head runat="server">
    <title>ButtonColumn Example</title>
</head>
<body>
 
   <form id="form1" runat="server">
 
      <h3>ButtonColumn Example</h3>
 
 
      <b>Product List</b>
 
      <asp:DataGrid id="ItemsGrid"
           BorderColor="black"
           BorderWidth="1"
           CellPadding="3"
           AutoGenerateColumns="false"
           OnItemCommand="Grid_CartCommand"
           runat="server">

         <HeaderStyle BackColor="#00aaaa">
         </HeaderStyle>
 
         <Columns>
 
            <asp:BoundColumn 
                 HeaderText="Item" 
                 DataField="StringValue"/>

            <asp:ButtonColumn 
                 HeaderText="Price" 
                 ButtonType="PushButton" 
                 DataTextField="CurrencyValue"
                 DataTextFormatString="{0:C}"
                 CommandName="AddToCart" /> 

         </Columns>

      </asp:DataGrid>

      <br /><br />

      <asp:Label id="Label1" runat="server"/>
 
   </form>
 
</body>
</html>

<%@ 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 xmlns="http://www.w3.org/1999/xhtml" >
   <script language="vb" runat="server">
        Function CreateDataSource() As ICollection
            Dim dt As New DataTable()
            Dim dr As DataRow
            
            dt.Columns.Add(New DataColumn("IntegerValue", GetType(Int32)))
            dt.Columns.Add(New DataColumn("StringValue", GetType(String)))
            dt.Columns.Add(New DataColumn("CurrencyValue", GetType(Double)))
            
            Dim i As Integer
            For i = 0 To 8
                dr = dt.NewRow()
                dr(0) = i
                dr(1) = "Item " + i.ToString()
                dr(2) = 1.23 *(i + 1)
                dt.Rows.Add(dr)
            Next i
            
            Dim dv As New DataView(dt)
            CreateDataSource = dv
        End Function 'CreateDataSource


        Sub Page_Load(sender As Object, e As EventArgs)
            If Not IsPostBack Then
                ' Load this data only once.
                ItemsGrid.DataSource = CreateDataSource()
                ItemsGrid.DataBind()
            End If
        End Sub 'Page_Load


        Sub Grid_CartCommand(sender As Object, e As DataGridCommandEventArgs)
            
            ' e.Item is the table row where the command is raised.
            ' For bound columns, the value is stored in the Text property of the TableCell.
            Label1.Text = "You selected: " + e.Item.Cells(0).Text + "."
        End Sub 'Grid_CartCommand 
   </script>
<head runat="server">
    <title>ButtonColumn Example</title>
</head>
<body>
 
   <form id="form1" runat="server">
 
      <h3>ButtonColumn Example</h3>
 
 
      <b>Product List</b>
 
      <asp:DataGrid id="ItemsGrid"
           BorderColor="black"
           BorderWidth="1"
           CellPadding="3"
           AutoGenerateColumns="false"
           OnItemCommand="Grid_CartCommand"
           runat="server">

         <HeaderStyle BackColor="#00aaaa">
         </HeaderStyle>
 
         <Columns>
 
            <asp:BoundColumn 
                 HeaderText="Item" 
                 DataField="StringValue"/>

            <asp:ButtonColumn 
                 HeaderText="Price" 
                 ButtonType="PushButton" 
                 DataTextField="CurrencyValue"
                 DataTextFormatString="{0:C}"
                 CommandName="AddToCart" /> 

         </Columns>

      </asp:DataGrid>

      <br /><br />

      <asp:Label id="Label1" runat="server"/>
 
   </form>
 
</body>
</html>

Remarks

Use the DataTextField property to specify the field name from the data source to bind to the Text property of the buttons in the ButtonColumn object.

Binding the column to a field instead of directly setting the Text property allows you to display different captions for the buttons in the ButtonColumn by using the values in the specified field.

The value of this property is stored in view state.

Applies to

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