Skip to main content

FormattingRule.DataMember Property

Specifies which of the data fields that are available in a FormattingRule.DataSource can be used in constructing a formatting rule’s FormattingRule.Condition.

Namespace: DevExpress.XtraReports.UI

Assembly: DevExpress.XtraReports.v24.1.dll

NuGet Package: DevExpress.Reporting.Core


public override string DataMember { get; set; }

Property Value

Type Description

A String value, specifying a data member.


The FormattingRule.DataSource and DataMember properties together specify the list of data fields used for Boolean condition construction (the FormattingRule.Condition property).

Note that by default, the DataSource and DataMember properties are set to null (Nothing in Visual Basic), which means that a report’s XtraReportBase.DataSource and XtraReportBase.DataMember properties are used to obtain data fields for the condition.


We recommend that you always specify a formatting rule’s data source and data member, to avoid an incorrect result.

In a master-detail setting, the DataMember property is specified using the following syntax: MasterTableName.DetailTableName.

To learn more, see Conditionally Changing a Control’s Appearance.


This example demonstrates how to conditionally change a control’s appearance at runtime. For this, it is necessary to create an instance of the FormattingRule class, specify its FormattingRule.Condition and FormattingRule.Formatting properties and add this object to a report’s sheet of formatting rules (XtraReport.FormattingRuleSheet) and to the collection of formatting rules of a control or a band, to which it should be applied (XRControl.FormattingRules). Note that the same task can be also solved at design time, as described in the Conditionally Changing a Control’s Appearance topic.

using System.Drawing;
using System.Drawing.Printing;
using DevExpress.XtraReports.UI;
// ...

private void XtraReport1_BeforePrint(object sender, CancelEventArgs e) {
    // Create a new rule and add it to a report.
    FormattingRule rule = new FormattingRule();

    // Specify the rule's properties.
    rule.DataSource = this.DataSource;
    rule.DataMember = this.DataMember;
    rule.Condition = "[UnitPrice] >= 30";
    rule.Formatting.BackColor = Color.WhiteSmoke;
    rule.Formatting.ForeColor = Color.IndianRed;
    rule.Formatting.Font = new Font("Arial", 10, FontStyle.Bold);

    // Apply this rule to the detail band.
See Also