GridViewColumn.HeaderTemplate Property

Specifies a template to display the column’s header content.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v23.2.dll

NuGet Package: DevExpress.Web

Declaration

C#

[DefaultValue(null)]
public virtual ITemplate HeaderTemplate { get; set; }

VB.NET

<DefaultValue(Nothing)>
Public Overridable Property HeaderTemplate As ITemplate

Property Value

Type	Default	Description
ITemplate	null	An object that implements the ITemplate interface.

Remarks

When you specify the HeaderTemplate property, the control creates a template within a container object of the GridViewHeaderTemplateContainer type.

At the control level, use the GridViewTemplates.Header property to specify a template for grid column headers.

Example

In the example below, the column’s header template contains a button. A click on the button shows the grid’s preview row.

ASPX

<dx:ASPxGridView ID="grid" runat="server" ClientInstanceName="grid" OnCustomCallback="grid_CustomCallback"
    PreviewFieldName="Notes" AutoGenerateColumns="false">
    <Columns>
        <dx:GridViewDataColumn FieldName="FirstName" VisibleIndex="1">
            <HeaderTemplate>
                <dx:ASPxButton ID="ASPxButton1" Text="First Name" runat="server" AutoPostBack="false">
                    <ClientSideEvents Click="function (e, s){
                        grid.PerformCallback('ChangePreviewVisible'); }" />
                </dx:ASPxButton>
            </HeaderTemplate>
        </dx:GridViewDataColumn>
        <%--...--%>
    </Columns>
</dx:ASPxGridView>

C#

protected void grid_CustomCallback(object sender, ASPxGridViewCustomCallbackEventArgs e){
    if (e.Parameters != "ChangePreviewVisible")
        return;
    var grid = (ASPxGridView)sender;
    if (Session["isPreviewVisible"] == null)
        Session["isPreviewVisible"] = false;
    grid.Settings.ShowPreview = !Convert.ToBoolean(Session["isPreviewVisible"]);
    Session["isPreviewVisible"] = grid.Settings.ShowPreview;
}