WebControl.ToolTip Property


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Gets or sets the text displayed when the mouse pointer hovers over the Web server control.

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

public virtual string ToolTip { get; set; }

Property Value

Type: System.String

The text displayed when the mouse pointer hovers over the Web server control. The default is String.Empty.

Use the ToolTip property to specify the custom text that is displayed when the mouse pointer hovers over the Web server control.


This property is rendered for all browsers. However, only Microsoft Internet Explorer will display this property as a ToolTip. All other browsers will ignore this property.

The value of this property, when set, can be saved automatically to a resource file by using a designer tool. For more information, see LocalizableAttribute and ASP.NET Globalization and Localization.

The following example illustrates how to set the ToolTip property on the Button control, which is inherited from the WebControl base class.


The following code sample uses the single-file code model and may not work correctly if copied directly into a code-behind file. This code sample must be copied into an empty text file that has an .aspx extension. For more information on the Web Forms code model, see ASP.NET Web Forms Page Code Model.

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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 

<script runat="server">

    void SubmitBtn_Click(object sender, EventArgs e)
        if (((Button)sender).CommandArgument == "1")
            Label1.Text = "Share your happiness!";
            Label1.Text = "Be happy!";

        Label1.BorderColor = System.Drawing.Color.BurlyWood;
        Label1.BorderWidth = 4;

 <html xmlns="http://www.w3.org/1999/xhtml">
 <head runat="server">
    <title>WebControl.ToolTip Example</title>
 <form id="Form1" runat="server">

    <h3>ToolTip Property of a Web Control</h3>
    <p>Don't know which button to click?<br />
        Move the mouse pointer over the buttons to find out!

    <p><asp:Button id="SubmitBtn1" OnClick="SubmitBtn_Click" 
            Text="Click Me" CommandArgument="1"
            ToolTip="Click me if you are happy" runat="server"/>

    <p><asp:Button id="SubmitBtn2" OnClick="SubmitBtn_Click" 
            Text="Click Me" CommandArgument="2"
            ToolTip="Click me if you are sad." runat="server"/>

    <asp:Label id="Label1" Font-size="24pt" Font-Bold="True" 
        BackColor="Yellow" runat="server"/>



.NET Framework
Available since 1.1
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