In this blog post, I will share a quick tip that showcases you the best way to check if the dropdown list contains a value or check if dropdownlist is empty in C#. Previously I have explained How to get html textbox value in ASP.Net
Check if dropdown has selected value C# ASP.Net
DropDownList represents a control that allows the user to select a single item from a drop-down list. To specify the items that you want to appear in the DropDownList control, place a ListItem object for each entry between the opening and closing tags of the DropDownList control.
Find the below source code to check if dropdown list contains value in C#:-
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Best way to check if a drop down list contains a value</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h2>Check if dropdownlist contains value</h2>
<asp:DropDownList ID="ddlTest" runat="server">
<asp:ListItem Text="Select"></asp:ListItem>
<asp:ListItem Value="ABC"></asp:ListItem>
<asp:ListItem Value="XYZ"></asp:ListItem>
</asp:DropDownList>
</div>
</form>
</body>
</html>
using System;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (ddlTest.Items.FindByValue("XYZ") != null)
{
ddlTest.SelectedIndex = 2;
}
}
}
OR
if (ddlMobileNumber.Items.FindByText(
GetMobileNumberCookie().ToString()) != null)
{
// .. your code here
}
OR
if (ddlMobileNumber.Items.Contains(new
ListItem(GetMobileNumberCookie().ToString())))
{
// .. your code here
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