Using the CultureInfo, you can get calendar information such as date, current month, current date etc. In this program we will get month name. Using the parameterized GetMonthName ( ) method , you can  retrieve month information.
<form id="form1" runat="server">
    <div>  
        <asp:Button ID="Button1"
         runat="server"
         BackColor="#33CCFF"
         onclick="Button1_Click"
         Text="Click"
          Width="69px" />  
    </div>
        <asp:Label ID="Label1"
         runat="server"
          BackColor="Yellow"
          Text="Label"></asp:Label>
    </form>
Code Behind
 protected void Button1_Click(object sender, EventArgs e)
        {          
            DateTime today = DateTime.Today;
            String Todaymonth = CultureInfo.CurrentCulture.DateTimeFormat.GetMonthName(today.Month);
            String month = CultureInfo.CurrentCulture.DateTimeFormat.GetMonthName(2);
            Label1.Text = "Today : " + today.ToLongDateString();
            Label1.Text += "<br /><br />today month Name= ";
            Label1.Text += Todaymonth;
            Label1.Text += "<br /><br /> [2] number month= ";
            Label1.Text += month;

        }
Code Generate the following output