How to add RadioButtonList list item programmatically in asp.net c#

How to add list item in RadioButtonList programmatically
RadioButtonListAddItem.aspx
<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    protected void Button1_Click(object sender, System.EventArgs e)
    {
        ListItem li = new ListItem();
        li.Text = TextBox1.Text.ToString();
        RadioButtonList1.Items.Add(li);
        Label1.Text = "ListItem added in RadioButtonList: " + li.Text;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to add list item in RadioButtonList programmatically</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Green">RadioButtonList example: Add List Item</h2>
        <asp:Label 
             ID="Label1" 
             runat="server"
             Font-Bold="true"
             ForeColor="DodgerBlue"
             Font-Size="Large"
             >
        </asp:Label>
        <br /><br />
        <asp:Label 
             ID="Label2" 
             runat="server" 
             Text="Color List"
             Font-Bold="true"
             ForeColor="Crimson"
             >
        </asp:Label>
        <br />
        <asp:RadioButtonList 
             ID="RadioButtonList1"
             runat="server"
             BackColor="Crimson"
             ForeColor="FloralWhite"
             RepeatColumns="2"
             >
             <asp:ListItem>SpringGreen</asp:ListItem>
             <asp:ListItem>Turquoise</asp:ListItem>
             <asp:ListItem>Violet</asp:ListItem>
             <asp:ListItem>SteelBlue</asp:ListItem>
             <asp:ListItem>Snow</asp:ListItem>
        </asp:RadioButtonList>
        <br /><br />
        <asp:Label 
             ID="Label3" 
             runat="server"
             ForeColor="Crimson"
             Text="Item Text"
             >
        </asp:Label>
        <asp:TextBox 
             ID="TextBox1"
             runat="server"
             BackColor="Crimson"
             ForeColor="Snow"
             >
        </asp:TextBox>
        <br />
        <asp:Button 
             ID="Button1" 
             runat="server"
             Text="Add List Item"
             Font-Bold="true"
             ForeColor="Crimson"
             OnClick="Button1_Click"
             />
    </div>
    </form>
</body>
</html>








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