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如何使用RequiredFieldValidator控件验证DropDownList？

2009-10-22 17:18 465 查看

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

<script runat=
"server"
>

void

btnSubmit_Click
(
Object sender, EventArgs e
)

{

if

(
Page.IsValid
)

lblResult.Text = dropFavoriteColor.SelectedValue;

}

</script>

<
html

xmlns=
"http://www.w3.org/1999/xhtml"
>

<head id=
"Head1"
runat=
"server"
>

<title>Show Initial Value</title>

</head>

<
body

>

<
form

id=
"form1"
runat=
"server"
>

<div>

<asp:Label

id=
"lblFavoriteColor"

Text=
"Favorite Color:"

AssociatedControlID=
"dropFavoriteColor"

Runat=
"server"
/>

<br />

<asp:DropDownList

id=
"dropFavoriteColor"

Runat=
"server"
>

<asp:ListItem Text=
"Select Color"
Value=
"none"
/>

<asp:ListItem Text=
"Red"
Value=
"Red"
/>

<asp:ListItem Text=
"Blue"
Value=
"Blue"
/>

<asp:ListItem Text=
"Green"
Value=
"Green"
/>

</asp:DropDownList>

<asp:RequiredFieldValidator

id=
"reqFavoriteColor"

Text=
"(Required)"

InitialValue=
"none"

ControlToValidate=
"dropFavoriteColor"

Runat=
"server"
/>

<br /><br />

<asp:Button

id=
"btnSubmit"

Text=
"Submit"

Runat=
"server"
OnClick=
"btnSubmit_Click"
/>

<hr />

<asp:Label

id=
"lblResult"

Runat=
"server"
/>

</div>

</
form

>

</
body

>

</
html

>

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