Add Items or Value to DropDownList 
Add Textbox Text Items or Value to Dropdownlist in Jquery & C# Coding in Dynamically Using Asp.Net C#.
DEMO
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HTML Coding
C# Coding
  
Add Textbox Text Items or Value to Dropdownlist in Jquery & C# Coding in Dynamically Using Asp.Net C#.
DEMO
Download
HTML Coding
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Add items to dropdownlist in asp.net using jquery</title>
    <script src="jquery.min.js"></script>
    <script>
        $(document).ready(function () {
            $('#btn_add').click(function () {
                $('#ddlCourse').append(
                    $('<option></option>').text($('#txtCourse').val()));
            });
        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div align="center">
    <asp:TextBox ID="txtCourse" runat="server"></asp:TextBox>
        <br />
        <asp:Button ID="btn_add" runat="server" Text="Add Item Jquery"  />
<asp:Button ID="Button1" runat="server" Text="Add Item C#" OnClick="Button1_Click" />
        <br />
<asp:DropDownList ID="ddlCourse" runat="server">
        <asp:ListItem Text="Select Course"></asp:ListItem>
        </asp:DropDownList>
    </div>
    </form>
</body>
</html>
C# Coding
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }   
    protected void Button1_Click(object sender, EventArgs e)
    {
        ddlCourse.Items.Add(txtCourse.Text);
    }
}
 




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