Button Control

Definition and Usage

The Button control is used to display a push button. The push button may be a submit button or a command button. By default, this control is a submit button.

A submit button does not have a command name and it posts the Web page back to the server when it is clicked. It is possible to write an event handler to control the actions performed when the submit button is clicked.

A command button has a command name and allows you to create multiple Button controls on a page. It is possible to write an event handler to control the actions performed when the command button is clicked.

Properties

Property	Description
CausesValidation	By default, a page is validated when a Button control is clicked. To prevent a page from being validated when clicking on a Button control, set this property to "false"
CommandArgument	Additional information about the command to perform
CommandName	The command associated with the Command event
id	A unique id for the control
OnClick	The name of the function to be executed when the button is clicked
runat	Specifies that the control is a server control. Must be set to "server"
Text	The text on the button

Example 1

In the following example we declare a submit Button control in an .aspx file. Then we create an event handler for the Click event which changes the text on the button:

<script runat="server">
  Sub submit(Source As Object, e As EventArgs)
    b1.Text="You clicked me!"
  End Sub
</script>

<html>
<body>
<form runat="server">
<asp:Button id="b1" Text="Click me" runat="server"
OnClick="submit" />
</form>
</body>
</html>

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