How to check if dropdown list contains value in C#

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
     }

Download Source Code

Check if dropdown has selected value C# ASP.Net

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