Enable Disable TextBox in GridView based on RadioButton selection in ASP.Net

Please refer this

HTML:

<form id="form1" runat="server">
<div>
    <asp:GridView ID="GridView1" HeaderStyle-BackColor="#3AC0F2" HeaderStyle-ForeColor="White"
        runat="server" AutoGenerateColumns="false">
        <Columns>
            <asp:BoundField DataField="Id" HeaderText="Id" ItemStyle-Width="30" />
            <asp:BoundField DataField="Name" HeaderText="Name" ItemStyle-Width="150" />
            <asp:TemplateField HeaderText="Gradaute">
                <ItemTemplate>
                    <asp:RadioButtonList ID="rblYesNO" runat="server" AutoPostBack="true" OnSelectedIndexChanged="rblYesNOSelectedIndexChanged">
                        <asp:ListItem Text="No" />
                        <asp:ListItem Text="Yes" />
                    </asp:RadioButtonList>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Enter Degree Name">
                <ItemTemplate>
                    <asp:TextBox ID="txtDegreeName" runat="server" />
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
</div>
</form>

C#:

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id", typeof(int)),
                        new DataColumn("Name", typeof(string)),
                        new DataColumn("Country",typeof(string)) });
        dt.Rows.Add(1, "John Hammond", "United States");
        dt.Rows.Add(2, "Mudassar Khan", "India");
        dt.Rows.Add(3, "Suzanne Mathews", "France");
        dt.Rows.Add(4, "Robert Schidner", "Russia");
        GridView1.DataSource = dt;
        GridView1.DataBind();
    }
}

protected void rblYesNOSelectedIndexChanged(object sender, EventArgs e)
{
    RadioButtonList rbl = sender as RadioButtonList;
    GridViewRow row = rbl.NamingContainer as GridViewRow;
    TextBox txt = row.FindControl("txtDegreeName") as TextBox;
    if (rbl.SelectedItem.Value == "No")
    {
        txt.Text = string.Empty;
        txt.Enabled = false;
    }
    else
    {
        txt.Enabled = true;
    }
}

Namespace:

using System.Data;

Image:

Thank You.