[Browsable(false)]
[DefaultValue("")]
[XtraSerializableProperty(1000)]
[XtraSerializablePropertyId(3)]
public string ActiveFilterString { get; set; }

<XtraSerializableProperty(1000)>
<XtraSerializablePropertyId(3)>
<Browsable(False)>
<DefaultValue("")>
Public Property ActiveFilterString As String

gridView1.ActiveFilterString = "([ProductID] = 1 OR [ProductID] = 3 " + 
  "OR [ProductID] > 10) AND [Discount] = 0";

GridView1.ActiveFilterString = "([ProductID] = 1 OR [ProductID] = 3 " & _
  "OR [ProductID] > 10) AND [Discount] = 0"

using System;
using DevExpress.ClipboardSource.SpreadsheetML;
using DevExpress.Data;
using DevExpress.XtraEditors;
using DevExpress.XtraEditors.Repository;
using DevExpress.XtraGrid;
using DevExpress.XtraGrid.Columns;
using DevExpress.XtraGrid.Views.Grid;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Runtime.CompilerServices;
using System.Windows.Forms;

namespace DXApplication {
    public partial class Form1 : XtraForm {
        public Form1() {
            InitializeComponent();
            this.Load += Form1_Load;
        }
        private void Form1_Load(object sender, EventArgs e) {
            GridControl gridControl1 = new GridControl() {
                Name = "gridControl1",
                Parent = this,
                Dock = DockStyle.Fill
            };
            gridControl1.DataSource = DataHelper.GetData(30);
            // The grid automatically creates columns for the public fields found in the data source. 
            // Calling the gridView1.PopulateColumns method is not required unless gridView1.OptionsBehavior.AutoPopulateColumns is disabled.

            // The grid automatically creates a GridView that displays the underlying data as a two-dimensional table.
            GridView gridView1 = gridControl1.MainView as GridView;

            // Obtain created columns.
            GridColumn colCompany = gridView1.Columns["CompanyName"];
            GridColumn colID = gridView1.Columns["ID"];
            GridColumn colDate = gridView1.Columns["RequiredDate"];
            GridColumn colPayment = gridView1.Columns["Value"];
            GridColumn colProcessed = gridView1.Columns["Processed"];

            // The Company column uses a ComboBox in-place editor that shows a list of available companies.
            RepositoryItemComboBox riComboBox = new RepositoryItemComboBox();
            riComboBox.Items.AddRange(DataHelper.companies);
            gridControl1.RepositoryItems.Add(riComboBox);
            colCompany.ColumnEdit = riComboBox;

            // Hide a column.
            colID.Visible = false;

            // Group and sort data.
            colCompany.GroupIndex = 0;
            colDate.SortIndex = 0;
            colDate.SortOrder = DevExpress.Data.ColumnSortOrder.Descending;

            // Show group columns in the table.
            gridView1.OptionsView.ShowGroupedColumns = true;

            // Expand group rows.
            gridView1.ExpandAllGroups();

            // Apply a filter.
            gridView1.ActiveFilterString = "[RequiredDate]>= #" + DateTime.Today.ToString() + "#";

            // Calculate two total summaries.
            colDate.Summary.Add(SummaryItemType.Count, colDate.FieldName, "Count={0}");
            colDate.Summary.Add(SummaryItemType.Max, colDate.FieldName, "Max={0:d}");
            gridView1.OptionsView.ShowFooter = true;

            // Calculate group summaries.
            GridGroupSummaryItem item = new GridGroupSummaryItem();
            item.FieldName = colCompany.FieldName;
            item.SummaryType = DevExpress.Data.SummaryItemType.Count;
            gridView1.GroupSummary.Add(item);

            GridGroupSummaryItem item1 = new GridGroupSummaryItem();
            item1.FieldName = colPayment.FieldName;
            item1.SummaryType = SummaryItemType.Sum;
            item1.DisplayFormat = "group total={0:c2}";
            item1.ShowInGroupColumnFooter = colPayment;
            gridView1.GroupSummary.Add(item1);

            // Forcibly move group footer summaries to positions in group rows under corresponding column headers. 
            gridView1.OptionsBehavior.AlignGroupSummaryInGroupRow = DevExpress.Utils.DefaultBoolean.True;

            // Focus a specific cell.
            gridView1.FocusedRowHandle = 1;
            gridView1.FocusedColumn = colCompany;

            // Optimize column widths.
            colDate.BestFit();
            colProcessed.BestFit();
        }
    }

    public class Record : INotifyPropertyChanged {
        public Record() {
        }
        int id;
        public int ID {
            get { return id; }
            set {
                if(id != value) {
                    id = value;
                    OnPropertyChanged();
                }
            }
        }

        string text;
        [DisplayName("Company")]
        public string CompanyName {
            get { return text; }
            set {
                if(text != value) {
                    if(string.IsNullOrEmpty(value))
                        throw new Exception();
                    text = value;
                    OnPropertyChanged();
                }
            }
        }
        Nullable<decimal> val;
        [DataType(System.ComponentModel.DataAnnotations.DataType.Currency)]
        [DisplayName("Payment")]
        public Nullable<decimal> Value {
            get { return val; }
            set {
                if(val != value) {
                    val = value;
                    OnPropertyChanged();
                }
            }
        }
        DateTime dt;
        [DisplayFormat(DataFormatString = "d")]
        public DateTime RequiredDate {
            get { return dt; }
            set {
                if(dt != value) {
                    dt = value;
                    OnPropertyChanged();
                }
            }
        }
        bool state;
        public bool Processed {
            get { return state; }
            set {
                if(state != value) {
                    state = value;
                    OnPropertyChanged();
                }
            }
        }

        public override string ToString() {
            return string.Format("ID = {0}, Text = {1}", ID, CompanyName);
        }

        public event PropertyChangedEventHandler PropertyChanged;
        protected void OnPropertyChanged([CallerMemberName] string propertyName = "") {
            if(PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    public class DataHelper {

        public static string[] companies = new string[] { "Hanari Carnes", "Que Delícia", "Romero y tomillo", "Mère Paillarde",
            "Comércio Mineiro", "Reggiani Caseifici", "Maison Dewey" };
        public static BindingList<Record> GetData(int count) {
            BindingList<Record> records = new BindingList<Record>();
            Random rnd = new Random();
            for(int i = 0; i < count; i++) {
                int n = rnd.Next(10);
                records.Add(new Record() {
                    ID = i + 100,
                    CompanyName = companies[i % companies.Length],
                    RequiredDate = DateTime.Today.AddDays(n - 5),
                    Value = i % 2 == 0 ? (i + 1) * 123 : i * 231,
                    Processed = i % 2 == 0,
                });
            };
            return records;
        }
    }

}

Imports System
Imports DevExpress.ClipboardSource.SpreadsheetML
Imports DevExpress.Data
Imports DevExpress.XtraEditors
Imports DevExpress.XtraEditors.Repository
Imports DevExpress.XtraGrid
Imports DevExpress.XtraGrid.Columns
Imports DevExpress.XtraGrid.Views.Grid
Imports System.ComponentModel
Imports System.ComponentModel.DataAnnotations
Imports System.Runtime.CompilerServices
Imports System.Windows.Forms

Namespace DXApplication
    Partial Public Class Form1
        Inherits XtraForm

        Public Sub New()
            InitializeComponent()
            AddHandler Me.Load, AddressOf Form1_Load
        End Sub
        Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
            Dim gridControl1 As New GridControl() With {.Name = "gridControl1", .Parent = Me, .Dock = DockStyle.Fill}
            gridControl1.DataSource = DataHelper.GetData(30)
            ' The grid automatically creates columns for the public fields found in the data source. 
            ' Calling the gridView1.PopulateColumns method is not required unless gridView1.OptionsBehavior.AutoPopulateColumns is disabled.

            ' The grid automatically creates a GridView that displays the underlying data as a two-dimensional table.
            Dim gridView1 As GridView = TryCast(gridControl1.MainView, GridView)

            ' Obtain created columns.
            Dim colCompany As GridColumn = gridView1.Columns("CompanyName")
            Dim colID As GridColumn = gridView1.Columns("ID")
            Dim colDate As GridColumn = gridView1.Columns("RequiredDate")
            Dim colPayment As GridColumn = gridView1.Columns("Value")
            Dim colProcessed As GridColumn = gridView1.Columns("Processed")

            ' The Company column uses a ComboBox in-place editor that shows a list of available companies.
            Dim riComboBox As New RepositoryItemComboBox()
            riComboBox.Items.AddRange(DataHelper.companies)
            gridControl1.RepositoryItems.Add(riComboBox)
            colCompany.ColumnEdit = riComboBox

            ' Hide a column.
            colID.Visible = False

            ' Group and sort data.
            colCompany.GroupIndex = 0
            colDate.SortIndex = 0
            colDate.SortOrder = DevExpress.Data.ColumnSortOrder.Descending

            ' Show group columns in the table.
            gridView1.OptionsView.ShowGroupedColumns = True

            ' Expand group rows.
            gridView1.ExpandAllGroups()

            ' Apply a filter.
            gridView1.ActiveFilterString = "[RequiredDate]>= #" & Date.Today.ToString() & "#"

            ' Calculate two total summaries.
            colDate.Summary.Add(SummaryItemType.Count, colDate.FieldName, "Count={0}")
            colDate.Summary.Add(SummaryItemType.Max, colDate.FieldName, "Max={0:d}")
            gridView1.OptionsView.ShowFooter = True

            ' Calculate group summaries.
            Dim item As New GridGroupSummaryItem()
            item.FieldName = colCompany.FieldName
            item.SummaryType = DevExpress.Data.SummaryItemType.Count
            gridView1.GroupSummary.Add(item)

            Dim item1 As New GridGroupSummaryItem()
            item1.FieldName = colPayment.FieldName
            item1.SummaryType = SummaryItemType.Sum
            item1.DisplayFormat = "group total={0:c2}"
            item1.ShowInGroupColumnFooter = colPayment
            gridView1.GroupSummary.Add(item1)

            ' Forcibly move group footer summaries to positions in group rows under corresponding column headers. 
            gridView1.OptionsBehavior.AlignGroupSummaryInGroupRow = DevExpress.Utils.DefaultBoolean.True

            ' Focus a specific cell.
            gridView1.FocusedRowHandle = 1
            gridView1.FocusedColumn = colCompany

            ' Optimize column widths.
            colDate.BestFit()
            colProcessed.BestFit()
        End Sub
    End Class

    Public Class Record
        Implements INotifyPropertyChanged

        Public Sub New()
        End Sub

        Private id_Renamed As Integer
        Public Property ID() As Integer
            Get
                Return id_Renamed
            End Get
            Set(ByVal value As Integer)
                If id_Renamed <> value Then
                    id_Renamed = value
                    OnPropertyChanged()
                End If
            End Set
        End Property

        Private text As String
        <DisplayName("Company")>
        Public Property CompanyName() As String
            Get
                Return text
            End Get
            Set(ByVal value As String)
                If text <> value Then
                    If String.IsNullOrEmpty(value) Then
                        Throw New Exception()
                    End If
                    text = value
                    OnPropertyChanged()
                End If
            End Set
        End Property
        Private val? As Decimal
        <DataType(System.ComponentModel.DataAnnotations.DataType.Currency), DisplayName("Payment")>
        Public Property Value() As Decimal?
            Get
                Return val
            End Get
            Set(ByVal value? As Decimal)
                If Not val.Equals(value) Then
                    val = value
                    OnPropertyChanged()
                End If
            End Set
        End Property
        Private dt As Date
        <DisplayFormat(DataFormatString := "d")>
        Public Property RequiredDate() As Date
            Get
                Return dt
            End Get
            Set(ByVal value As Date)
                If dt <> value Then
                    dt = value
                    OnPropertyChanged()
                End If
            End Set
        End Property
        Private state As Boolean
        Public Property Processed() As Boolean
            Get
                Return state
            End Get
            Set(ByVal value As Boolean)
                If state <> value Then
                    state = value
                    OnPropertyChanged()
                End If
            End Set
        End Property

        Public Overrides Function ToString() As String
            Return String.Format("ID = {0}, Text = {1}", ID, CompanyName)
        End Function

        Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged
        Protected Sub OnPropertyChanged(Optional <CallerMemberName> ByVal propertyName As String = "")
            RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(propertyName))
        End Sub
    End Class

    Public Class DataHelper

        Public Shared companies() As String = { "Hanari Carnes", "Que Delícia", "Romero y tomillo", "Mère Paillarde", "Comércio Mineiro", "Reggiani Caseifici", "Maison Dewey" }
        Public Shared Function GetData(ByVal count As Integer) As BindingList(Of Record)
            Dim records As New BindingList(Of Record)()
            Dim rnd As New Random()
            For i As Integer = 0 To count - 1
                Dim n As Integer = rnd.Next(10)
                records.Add(New Record() With {.ID = i + 100, .CompanyName = companies(i Mod companies.Length), .RequiredDate = Date.Today.AddDays(n - 5), .Value = If(i Mod 2 = 0, (i + 1) * 123, i * 231), .Processed = i Mod 2 = 0})
            Next i
            Return records
        End Function
    End Class

End Namespace

if (string.IsNullOrEmpty(filterNameEdit.Text.Trim())) return;
GridFitlerItem fItem = filters.FirstOrDefault(it => it.FilterString == view.ActiveFilterString);
if (fItem == null)

this.ordersTableAdapter.Fill(this.nwindDataSet.Orders);
    gridView1.ActiveFilterString = "CustomerID = 'ALFKI'";
}

If String.IsNullOrEmpty(filterNameEdit.Text.Trim()) Then Return
Dim fItem As GridFitlerItem = filters.FirstOrDefault(Function(it) Equals(it.FilterString, view.ActiveFilterString))
If fItem Is Nothing Then

Me.ordersTableAdapter.Fill(Me.nwindDataSet.Orders)
    gridView1.ActiveFilterString = "CustomerID = 'ALFKI'"
End Sub