public void Page_Load(object sender, EventArgs e)
{
    string s = watermelon;
    string t, v, w;
    int n, m;

    // Test Insert method.
    t = s.Insert(4, grape);
    Response.Write(t + <br />);

    // Test IndexOf Method.
    n = s.IndexOf(mel);
    m = s.IndexOf(xyz);
    Response.Write(n +   + m + <br />);

    // Test Substring Method.
    v = s.Substring(3, 5);
    Response.Write(v + <br />);

    // Test PadLeft Method.
    w = s.PadLeft(20, '$');
    Response.Write(w + <br />);
}