Description:-
In this example we explain that how to set RequireField
Validator for Dropdownlist and Listbox in asp.net or how to validate
dropdownlist and listbox in asp.net.
We all know that in any website and web application all
developer must need to validate Dropdownlist and listbox in many web forms
because of that is the basic requirement in any website.
The main point must keep in mind when you have to set
RequireField validator for the Dropdownlist or Listbox is that you have to set InitialValue="0" property
of the RequireField validator and in Dropdownlist put this line <asp:ListItem Value="0">--Select--</asp:ListItem>
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Code:-
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="validatedropdownlist.aspx.cs"
Inherits="validatedropdownlist"
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Validate ListBox and DropDown List using Required
Field Validator</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ListBox ID="lstboxCountry"
runat="server"
Width="200px"
SelectionMode="Multiple">
<asp:ListItem Value="1">India </asp:ListItem>
<asp:ListItem Value="2">Pakistan </asp:ListItem>
<asp:ListItem Value="3">Austalia</asp:ListItem>
<asp:ListItem Value="4">Japan </asp:ListItem>
<asp:ListItem Value="5">UK </asp:ListItem>
<asp:ListItem Value="6">USA </asp:ListItem>
</asp:ListBox>
<asp:RequiredFieldValidator
ID="RequiredFieldValidator1"
ControlToValidate="lstboxCountry"
InitialValue=""
runat="server"
ErrorMessage="selection
of country is required"></asp:RequiredFieldValidator>
</div>
<br />
<div>
<asp:DropDownList ID="drpdwnCity"
runat="server"
Width="200px">
<asp:ListItem Value="0">--Select--</asp:ListItem>
<asp:ListItem Value="1">Ahmedabad</asp:ListItem>
<asp:ListItem Value="2">Rajkot </asp:ListItem>
<asp:ListItem Value="3">Surat </asp:ListItem>
<asp:ListItem Value="4">Baroda </asp:ListItem>
<asp:ListItem Value="5">Junagadh</asp:ListItem>
<asp:ListItem Value="6">Bhavanagar</asp:ListItem>
</asp:DropDownList>
<asp:RequiredFieldValidator
ID="RequiredFieldValidator2"
ControlToValidate="drpdwnCity"
InitialValue="0"
runat="server"
ErrorMessage="selection
of city is required"></asp:RequiredFieldValidator>
</div>
<br />
<asp:Button ID="btnSubmit"
runat="server"
Text="Submit"
/>
</form>
</body>
</html>
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