DataGridColumn.Visible Property
.NET Framework (current version)
Gets or sets a value that indicates whether the column is visible in the DataGrid control.
Assembly: System.Web (in System.Web.dll)
Use the Visible property to programmatically control whether the column is visible in the DataGrid control.
The following code example demonstrates how to use the Visible property to indicate whether a column is visible.
<%@ 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 runat="server"> Function CreateDataSource() As ICollection ' Create sample data for the DataGrid control. Dim dt As DataTable = New DataTable() Dim dr As DataRow ' Define the columns of the table. dt.Columns.Add(New DataColumn("IntegerValue", GetType(Int32))) dt.Columns.Add(New DataColumn("StringValue", GetType(string))) dt.Columns.Add(New DataColumn("CurrencyValue", GetType(double))) ' Populate the table with sample values. Dim i As Integer For i = 0 to 4 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 DataView = New DataView(dt) Return dv End Function Sub Page_Load(sender As Object, e As EventArgs) ' Load sample data only once, when the page is first loaded. If Not IsPostBack Then ItemsGrid.DataSource = CreateDataSource() ItemsGrid.DataBind() End If End Sub Sub Button_Click(sender As Object, e As EventArgs) ' Count the number of selected items in the DataGrid control. Dim count As Integer = 0 ' Display the selected times. Message.Text = "You Selected: <br />" ' Iterate through each item (row) in the DataGrid control and ' determine whether it is selected. Dim item As DataGridItem For Each item In ItemsGrid.Items DetermineSelection(item, count) Next ' If no items are selected, display the appropriate message. If count = 0 Then Message.Text = "No items selected" End If End Sub Sub DetermineSelection(item As DataGridItem, ByRef count As Integer) ' Retrieve the SelectCheckBox CheckBox control from the ' specified item (row) in the DataGrid control. Dim selection As CheckBox = _ CType(item.FindControl("SelectCheckBox"), CheckBox) ' If the item is selected, display the appropriate message and ' increment the count of selected items. If Not selection Is Nothing Then If selection.Checked Then Message.Text &= "- " & item.Cells(1).Text & "<br />" count = count + 1 End If End If End Sub Sub Check_Change(sender As Object, e As EventArgs) ' Show or hide the first column depending on the value of ' the check box. If ShowCheckBox.Checked Then ItemsGrid.Columns(0).Visible = True Else ItemsGrid.Columns(0).Visible = False End If End Sub </script> <head runat="server"> <title>DataGridColumn Visible Example</title> </head> <body> <form id="form1" runat="server"> <h3>DataGridColumn Visible Example</h3> Select whether to show or hide the first column. <br /><br /> <b>Product List</b> <asp:DataGrid id="ItemsGrid" BorderColor="black" BorderWidth="1" CellPadding="3" ShowFooter="True" AutoGenerateColumns="False" runat="server"> <HeaderStyle BackColor="#00aaaa"> </HeaderStyle> <FooterStyle BackColor="#00aaaa"> </FooterStyle> <Columns> <asp:BoundColumn DataField="IntegerValue" Visible="True" HeaderText="Item"/> <asp:BoundColumn DataField="StringValue" Visible="True" HeaderText="Description"/> <asp:BoundColumn DataField="CurrencyValue" Visible="True" HeaderText="Price" DataFormatString="{0:c}"> <ItemStyle HorizontalAlign="Right"> </ItemStyle> </asp:BoundColumn> <asp:TemplateColumn HeaderText="Select Item" Visible="True" > <ItemTemplate> <asp:CheckBox id="SelectCheckBox" Text="Add to Cart" Checked="False" runat="server"/> </ItemTemplate> </asp:TemplateColumn> </Columns> </asp:DataGrid> <br /><br /> <asp:Button id="SubmitButton" Text="Submit" OnClick = "Button_Click" runat="server"/> <br /><br /> <asp:Label id="Message" runat="server"/> <hr /> <asp:CheckBox id="ShowCheckBox" Text="Show first column" AutoPostBack="True" OnCheckedChanged="Check_Change" Checked="True" runat="server"/> </form> </body> </html>
.NET Framework
Available since 1.1
Available since 1.1
Show: