BoundField.NullDisplayText Property

Note: This property is new in the .NET Framework version 2.0.

Gets or sets the caption displayed for a field when the field's value is null.

Namespace: System.Web.UI.WebControls
Assembly: System.Web (in system.web.dll)

public virtual string NullDisplayText { get; set; }
/** @property */
public String get_NullDisplayText ()

/** @property */
public void set_NullDisplayText (String value)

public function get NullDisplayText () : String

public function set NullDisplayText (value : String)

Property Value

The caption displayed for a field when the field's value is null. The default is an empty string (""), which indicates that this property is not set.

Sometimes a field's value is stored as null in the data source. You can specify a custom caption to display for fields that have a null value by setting the NullDisplayText property. If this property is not set, null field values are displayed as empty strings (""). When a record is being updated or inserted in a data-bound control, if the user enters the value specified by this property (other than an empty string) for a field in a data-bound control, that value is automatically converted to null in the data source.


To convert an empty string field value to a null value, set the ConvertEmptyStringToNull property to true.

The following code example demonstrates how to use the NullDisplayText property to specify a custom caption to display for null field values.

<%@ Page language="C#" %>

    <form runat="server">
      <h3>BoundField NullDisplayText Example</h3>

      <asp:gridview id="DiscountsGridView" 
          <asp:boundfield datafield="discounttype"
            nulldisplaytext="No Data"
            headertext="Discount Type"/>
          <asp:boundfield datafield="stor_id"
            nulldisplaytext="No Data"
            headertext="Store ID"/> 
          <asp:boundfield datafield="lowqty"
            nulldisplaytext="No Data"
            headertext="Low Quantity"/>
          <asp:boundfield datafield="highqty"
            nulldisplaytext="No Data"
            headertext="High Quantity"/>
          <asp:boundfield datafield="discount"
            nulldisplaytext="No Data"
      <!-- This example uses Microsoft SQL Server and connects -->
      <!-- to the Pubs sample database.                        -->
      <asp:sqldatasource id="DiscountsSqlDataSource"  
        selectcommand="SELECT [discounttype], [stor_id], [lowqty], [highqty], [discount] FROM [discounts]"
        connectionstring="<%$ ConnectionStrings:PubsConnectionString%>"

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0