[DefaultValue("")]
public string DisplayMember { get; set; }

<DefaultValue("")>
Public Property DisplayMember As String

using DevExpress.XtraReports.Parameters;
using DevExpress.XtraReports.UI;
using System;
using System.Collections.Generic;
// ...
DevExpress.DataAccess.ObjectBinding.ObjectDataSource objectDataSource = 
    new DevExpress.DataAccess.ObjectBinding.ObjectDataSource()
{
    Name = "ObjectDataSource1",
    DataSource = CreateLookups(),
};
public XtraReport CreateReportWithDateParameterDynamicList()
{
    XtraReport report = new XtraReport();
    Parameter myDateParameter = new Parameter();
    myDateParameter.Name = "myDateParameter";
    // Sets the Visible property to true to request the parameter value from users.
    // Sets this property to false to apply the parameter's value that is specified in code.
    myDateParameter.Visible = true;
    myDateParameter.Type = typeof(System.DateTime);
    // Specifies the storage for the parameter's predefined values
    DynamicListLookUpSettings lookupSettings = new DynamicListLookUpSettings();
    lookupSettings.DataSource = objectDataSource;
    lookupSettings.ValueMember = "Value";
    lookupSettings.DisplayMember = "Description";
    myDateParameter.ValueSourceSettings = lookupSettings;
    report.Parameters.Add(myDateParameter);
    // Filters report data by the specified parameter.
    report.FilterString = "GetDate([OrderDate]) >= ?myDateParameter";

    return report;
}
static List<LookUpValue> CreateLookups()
{
    return new List<LookUpValue>() {
new LookUpValue(new DateTime(2019, 01, 01), "January 1, 2019"),
new LookUpValue(new DateTime(2019, 02, 01), "February 1, 2019"),
    };
}

Imports DevExpress.XtraReports.Parameters
Imports DevExpress.XtraReports.UI
Imports System
Imports System.Collections.Generic
' ...
Private objectDataSource As New DevExpress.DataAccess.ObjectBinding.ObjectDataSource() With {.Name = "ObjectDataSource1", .DataSource = CreateLookups()}
Public Function CreateReportWithDateParameterDynamicList() As XtraReport
    Dim report As New XtraReport()
    Dim myDateParameter As New Parameter()
    myDateParameter.Name = "myDateParameter"
    ' Sets the Visible property to true to request the parameter value from users.
    ' Sets this property to false to apply the parameter's value that is specified in code.
    myDateParameter.Visible = True
    myDateParameter.Type = GetType(Date)
    ' Specifies the storage for the parameter's predefined values
    Dim lookupSettings As New DynamicListLookUpSettings()
    lookupSettings.DataSource = objectDataSource
    lookupSettings.ValueMember = "Value"
    lookupSettings.DisplayMember = "Description"
    myDateParameter.ValueSourceSettings = lookupSettings
    report.Parameters.Add(myDateParameter)
    ' Filters report data by the specified parameter.
    report.FilterString = "GetDate([OrderDate]) >= ?myDateParameter"

    Return report
End Function
Private Shared Function CreateLookups() As List(Of LookUpValue)
    Return New List(Of LookUpValue)() From {
        New LookUpValue(New Date(2019, 1, 1), "January 1, 2019"),
        New LookUpValue(New Date(2019, 2, 1), "February 1, 2019")
    }
End Function

lookupSettings.DataMember = "Categories";
lookupSettings.DisplayMember = "CategoryName";
lookupSettings.ValueMember = "CategoryId";

lookupSettings.ValueMember = "Name";
lookupSettings.DisplayMember = "Position";

lookupSettings.ValueMember = "Name"
lookupSettings.DisplayMember = "Position"