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ASPxMemo Class

A multi-line text editor.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v23.1.dll

NuGet Package: DevExpress.Web


public class ASPxMemo :


The Memo allows you to input text in multiple lines.


Create a Memo

Design Time

The ASPxMemo control is available on the DX.23.1: Common Controls toolbox tab in the Microsoft Visual Studio IDE.

Memo in Toolbox

Drag the control onto a form and customize the control’s settings, or paste the control markup in the page’s source code.


To properly function, DevExpress controls require that special modules, handlers and options are registered in the the Web.config file. Switch the Microsoft Visual Studio IDE to the Design tab to automatically update the Web.config file with the required DevExpress information.

<dx:ASPxMemo ID="ASPxMemo2" runat="server" Height="70px" Width="170px" Text="Sample Text" HorizontalAlign="Justify" Caption="Caption Text">

Run Time

using DevExpress.Web;
protected void Page_Load(object sender, EventArgs e)
    ASPxMemo memo = new ASPxMemo();
    memo.ID = "ASPxMemo1";
    memo.Height = Unit.Pixel(70);
    memo.Width = Unit.Pixel(170);
    memo.Text = "Sample Text";
    memo.Caption = "Caption Text";
    memo.HorizontalAlign = HorizontalAlign.Justify;
    memo.Theme = "Office365";

Client-Side API

The ASPxMemo‘s client-side API is implemented with JavaScript language and exposed by the ASPxClientMemo object.


Available by default.

Client object type


Access name




<dx:ASPxMemo ID="ASPxMemo2" runat="server" Height="70px" ClientInstanceName="memo" Width="170px">

<dx:ASPxButton ID="Button" runat="server" Text="Get memo text" AutoPostBack="false">
    <ClientSideEvents Click="OnClick" />
function OnClick(s, e) {

Automatic Scroll Bar Activation

The Memo shows the vertical scroll bar automatically if the content does not fit the editor’s size.

Null Prompt Text

The Memo allows you to display a prompt text (NullText, NullTextDisplayMode ) if the editor’s content is empty and the editor is not focused. The prompt text disappears when the editor receives focus.

<dx:ASPxMemo ID="ASPxMemo2" NullText="Null Text" NullTextDisplayMode="UnfocusedAndFocused" ...>

See demo

Native Mode

Set the Native property to true to render the ASPxMemo as a native HTMl element (textarea). This reduces the amount of generated HTML code and improves the editor’s performance. In native mode, the memo’s appearance depends on how the client browser renders native HTML elements.

Learn more | See demo

Built-in Validation

The Memo allows you to validate its data on the client and server side and provide descriptive error messages when necessary.

<dx:ASPxMemo ID="ASPxMemo2" ...>
    <ValidationSettings Display="Dynamic" ErrorDisplayMode="Text" ValidateOnLeave="true">
        <RequiredField ErrorText="Custom Error Text" IsRequired="true" />

Learn more | See demo

Online Examples

See Also