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.NET Framework Class Library
ButtonClick Event

Occurs when the Button control is clicked.

Namespace:   System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)
Syntax
Public Event Click As [%$TOPIC/d02sce24_en-us_VS_110_2_0_0_0_0%]
public event [%$TOPIC/d02sce24_en-us_VS_110_2_0_1_0_0%] Click
public:
virtual   event [%$TOPIC/d02sce24_en-us_VS_110_2_0_2_0_0%]^ Click {
	void add ([%$TOPIC/d02sce24_en-us_VS_110_2_0_2_0_1%]^ value);
	void remove ([%$TOPIC/d02sce24_en-us_VS_110_2_0_2_0_2%]^ value);
}
abstract Click : IEvent<[%$TOPIC/d02sce24_en-us_VS_110_2_0_3_0_0%],
    [%$TOPIC/d02sce24_en-us_VS_110_2_0_3_0_1%]>
override Click : IEvent<[%$TOPIC/d02sce24_en-us_VS_110_2_0_3_0_2%],
    [%$TOPIC/d02sce24_en-us_VS_110_2_0_3_0_3%]>
<asp:[%$TOPIC/d02sce24_en-us_VS_110_2_0_4_0_0%] OnClick="[%$TOPIC/d02sce24_en-us_VS_110_2_0_4_0_1%]" />

Implements

IButtonControlClick
Remarks

The Click event is raised when the Button control is clicked. This event is commonly used when no command name is associated with the Button control (for instance, with a Submit button).

For more information about handling events, see Consuming Events.

Examples

The following code example demonstrates how to specify and code an event handler for the Click event in order to display a message on the Web page when the Button control is clicked.

<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    Sub GreetingBtn_Click(ByVal sender As Object, _
                          ByVal e As EventArgs)

        ' When the button is clicked,
        ' change the button text, and disable it.

        Dim clickedButton As Button = sender
        clickedButton.Text = "...button clicked..."
        clickedButton.Enabled = False

        ' Display the greeting label text.
        GreetingLabel.Visible = True
    End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Button Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <h3>Simple Button Example</h3>

      <asp:Button id="Button1"
           Text="Click here for greeting..."
           OnClick="GreetingBtn_Click" 
           runat="server"/>
      <br />
      <br />
      <asp:Label ID="GreetingLabel" runat="server" 
                 Visible="false" Text="Hello World!" />
    </div>
    </form>
</body>
</html>
<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    void Page_Load(Object sender, EventArgs e)
    {
        // Manually register the event-handling method for
        // the Click event of the Button control.
        Button1.Click += new EventHandler(this.GreetingBtn_Click);
    }

    void GreetingBtn_Click(Object sender,
                           EventArgs e)
    {
        // When the button is clicked,
        // change the button text, and disable it.

        Button clickedButton = (Button)sender;
        clickedButton.Text = "...button clicked...";
        clickedButton.Enabled = false;

        // Display the greeting label text.
        GreetingLabel.Visible = true;
    }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <h3>Simple Button Example</h3>

      <asp:Button id="Button1"
           Text="Click here for greeting..."
           OnClick="GreetingBtn_Click" 
           runat="server"/>
      <br />
      <br />
      <asp:Label ID="GreetingLabel" runat="server" 
                 Visible="false" Text="Hello World!" />
    </div>
    </form>
</body>
</html>
Version Information

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0
Platforms

Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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