Expression Column

Updated on Sep 15, 2025

GridViewExpressionColumn derives from the GridViewColumn class and allows you to display various calculations in RadGridView itself. The GridViewExpressionColumn can be sorted and grouped like any other type of column.

For the purposes of this example, we will use the objects and viewmodel defined in examples 1 and 2.

Example 1: The Product class

C#

    public class Product
    {
        public int ProductID { get; set; }
        public string ProductName { get; set; }
        public int UnitPrice { get; set; }
        public int UnitsInStock { get; set; }
    }

VB.NET

	Public Class Product
		Public Property ProductID() As Integer
		Public Property ProductName() As String
		Public Property UnitPrice() As Integer
		Public Property UnitsInStock() As Integer
	End Class

Example 2: The viewmodel

C#

    public class MainViewModel : ViewModelBase
    {
        private ObservableCollection<Product> products;

        public ObservableCollection<Product> Products
        {
            get
            {
                if (this.products == null)
                {
                    this.products = new ObservableCollection<Product>();
                    for (int i = 1; i <= 5; i++)
                    {
                        this.products.Add(new Product() { ProductID = i, ProductName = "Product " + i, UnitPrice = i * 10, UnitsInStock = i });
                    }
                }

                return this.products;
            }
        }
    }

VB.NET

	Public Class MainViewModel
		Inherits ViewModelBase

		Private _products_ As ObservableCollection(Of Product)

		Public ReadOnly Property Products() As ObservableCollection(Of Product)
			Get
				If Me._products_ Is Nothing Then
					Me._products_ = New ObservableCollection(Of Product)()
					For i As Integer = 1 To 5
						Me._products_.Add(New Product() With {
							.ProductID = i,
							.ProductName = "Product " & i,
							.UnitPrice = i * 10,
							.UnitsInStock = i
						})
					Next i
				End If

				Return Me._products_
			End Get
		End Property
	End Class

With this data setup, we can bind the GridViewExpressionColumn as shown in Example 3.

Example 3: Define GridViewExpressionColumn in XAML

XAML

	<telerik:RadGridView x:Name="GridView" ItemsSource="{Binding Products}" AutoGenerateColumns="False" ColumnWidth="*">
	    <telerik:RadGridView.Columns>
	        <telerik:GridViewDataColumn Header="Product ID" DataMemberBinding="{Binding ProductID}" />
	        <telerik:GridViewDataColumn Header="Product name" DataMemberBinding="{Binding ProductName}" />
	        <telerik:GridViewDataColumn Header="Unit price" DataMemberBinding="{Binding UnitPrice}" DataFormatString="{}{0:C}" />
	        <telerik:GridViewDataColumn Header="Units in stock" DataMemberBinding="{Binding UnitsInStock}" />
	        <telerik:GridViewExpressionColumn Header="Total value in stock" Expression="UnitPrice * UnitsInStock" DataFormatString="{}{0:C}" />
	    </telerik:RadGridView.Columns>
	</telerik:RadGridView>

The most important property to be set is the Expression property. It can also be set in code-behind, for example, if the expression is too complex to be translated in XAML.

Example 4: Set Expression for GridViewExpressionColumn in code.

C#

	Expression<Func<Product, double>> expression = prod => prod.UnitPrice * prod.UnitsInStock;
	GridViewExpressionColumn column = this.GridView.Columns.OfType<GridViewExpressionColumn>().First();
	column.Expression = expression;

VB.NET

	Dim expression As Expression(Of Func(Of Product, Double)) = Function(prod) prod.UnitPrice * prod.UnitsInStock
	Dim column As GridViewExpressionColumn = Me.GridView.Columns.OfType(Of GridViewExpressionColumn)().First()
	column.Expression = expression

The values displayed in GridViewExpressionColumn will be updated automatically when a concerned property on the data item changes.

More information about expressions could be found here.