Hi nauna,

Please refer below sample code.

Also refer below link-

Get Selected Text and Value of ASP.Net RadioButtonList using jQuery

HTML

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script type="text/javascript">
    $(function () {
        TextBoxShowHide();
        $("#RadioButtonList2 [type=radio]").change(function () {
            TextBoxShowHide();
        });
    });
    function TextBoxShowHide() {
        var val = $('#RadioButtonList2 input[type=radio]:checked').val();
        if (val == '1' || $('#RadioButtonList2 input[type=radio]:checked').length == 0) {
            $('#<%= TextBox11.ClientID%>').hide();
            document.getElementById("<%=TextBox3.ClientID %>").disabled = false;
            document.getElementById("<%=TextBox3.ClientID %>").value = "";
        }
        else {
            $('#<%= TextBox11.ClientID%>').show();
            document.getElementById("<%=TextBox3.ClientID %>").disabled = true;
            document.getElementById("<%=TextBox3.ClientID %>").value = "0";
        }
    }
</script>
<div>
    <asp:TextBox ID="TextBox11" runat="server" placeholder="Textbox 11"></asp:TextBox>
    <asp:TextBox ID="TextBox3" runat="server" placeholder="Textbox 3"></asp:TextBox>
    <asp:RadioButtonList ID="RadioButtonList2" runat="server">
    </asp:RadioButtonList>
</div>

Namespaces

C#

using System.Data;
using System.Configuration;
using System.Data.SqlClient;

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        string constr = ConfigurationManager.ConnectionStrings["Constring"].ConnectionString;
        using (SqlConnection con = new SqlConnection(constr))
        {
            string query = "SELECT FruitName, FruitId FROM Fruits";
            using (SqlCommand cmd = new SqlCommand(query))
            {
                cmd.CommandType = CommandType.Text;
                cmd.Connection = con;
                con.Open();
                RadioButtonList2.DataSource = cmd.ExecuteReader();
                RadioButtonList2.DataTextField = "FruitName";
                RadioButtonList2.DataValueField = "FruitId";
                RadioButtonList2.DataBind();
                con.Close();
            }
        }
    }
}

Screenshot