public IEnumerable AppointmentStatusSource { get; set; }

<DxScheduler StartDate="@DateTime.Today"
             DataStorage="@DataStorage">
    <DxSchedulerWeekView ShowWorkTimeOnly="true"></DxSchedulerWeekView>
</DxScheduler>

@code {
    DxSchedulerDataStorage DataStorage = new DxSchedulerDataStorage() {
        // Specify appointment mappings here.
        // ...
        AppointmentStatusSource = StatusCollection.GetStatuses(),
        AppointmentStatusMappings = new DxSchedulerAppointmentStatusMappings() {
            Id = "Id",
            Caption = "StatusCaption",
            Color = "StatusColor",
            // Uncomment the line below and comment the line above to specify other style options.
            //CssClass = "CssClass",
            // Map the source object's custom field to the status item's custom property.
            CustomFieldMappings = new List<DxSchedulerCustomFieldMapping> {
                new DxSchedulerCustomFieldMapping { Name = "MyCustomProperty", Mapping = "MyCustomField" }
            }
        }
    };
}

.status1-style {
    background-color: lightblue;
    border-color: blue;
}
.status2-style {
    background-color: lightgreen;
    border-color: green;
}

public class StatusObject {
    public int Id { get; set; }
    public string StatusCaption { get; set; }
    public System.Drawing.Color StatusColor { get; set; }
    public string CssClass { get; set; }
    public string MyCustomField { get; set; } // A custom field
}

public static class StatusCollection {
    public static List<StatusObject> GetStatuses() {
        DateTime date = DateTime.Today;
        var dataSource = new List<StatusObject>() {
            new StatusObject() {
                Id = 1,
                StatusCaption = "Resolved",
                StatusColor = System.Drawing.Color.LightBlue,
                // Uncomment the line below and comment the line above to specify other style options.
                //CssClass = "status1-style",
                MyCustomField = "Custom text for the 'Resolved' status",
            },
            new StatusObject() {
                Id = 2,
                StatusCaption = "In process",
                StatusColor = System.Drawing.Color.LightGreen,
                // Uncomment the line below and comment the line above to specify other style options.
                //CssClass = "status2-style",
                MyCustomField = "Custom text for the 'In process' status",
            }
        };
        return dataSource;
    }
}

Storage.AppointmentLabelsSource = await LblService.GetLabelsAsync();
    Storage.AppointmentStatusSource = await StsService.GetStatusesAsync();
}