Populate dropdown list

I have 2 drop down lists that I would like to populate.

One dropdown list is Months and the other is Years.

I would like the Months dropdown to shown the last 12 months and the Year to show current year and previous year with both default selected on the current.

Any ideas?
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Try using ajax  is very easy to adapt in a asp.net page

In your aspx page:
<asp:DropDownList runat="server" id="MonthDDL">
  <ListItem value="1" text="January" />
  <ListItem value="2" text="February" />
  <ListItem value="3" text="March" />
  <ListItem value="4" text="April" />
  <ListItem value="5" text="May" />
  <ListItem value="6" text="June" />
  <ListItem value="7" text="July" />
  <ListItem value="8" text="August" />
  <ListItem value="9" text="September" />
  <ListItem value="10" text="October" />
  <ListItem value="11" text="November" />
  <ListItem value="12" text="December" />
<asp:DropDownList runat="server" id="YearDDL" />

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In your code behind:
protected void Page_Load(object sender, EventArgs e)
         MonthDDL.SelectedValue = DateTime.Now.Month.ToString();

         for(int counter = 0; counter < 2; ++counter)
              string yearToAdd = (DateTime.Now.Year - counter).ToString();
              YearDDL.Items.Add(new ListItem(yearToAdd))

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I have create belwo two drop down controls in the aspx page
<asp:DropDownList ID="ddlYear" runat="server" 
            onselectedindexchanged="ddlYear_SelectedIndexChanged" AutoPostBack="true" ></asp:DropDownList>

            <asp:DropDownList ID="ddlMonth" runat="server"></asp:DropDownList>

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Below the login in code behind to populate the months based on your requirment

string[] Months = new string[]{ "January", "Feburary", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };
        protected void Page_Load(object sender, EventArgs e)
            if (!IsPostBack)
                int year = DateTime.Now.Year;
                ddlYear.Items.Add( new ListItem(year.ToString() , year.ToString()));
                if (DateTime.Now.Month < 12)
                    ddlYear.Items.Add(new ListItem(year.ToString(), year.ToString()));

        protected void ddlYear_SelectedIndexChanged(object sender, EventArgs e)

        private void PopulateMonth(int year)
            if (year == DateTime.Now.Year)
                int MonthMaxCount = DateTime.Now.Month;
                for (int i = 1; i <= MonthMaxCount; i++)
                    ddlMonth.Items.Add(new ListItem(Months[i - 1], i.ToString()));
                int MonthremaingCount = DateTime.Now.Month +1;
                for (; MonthremaingCount <= 12; MonthremaingCount++)
                    ddlMonth.Items.Add(new ListItem(Months[MonthremaingCount - 1], MonthremaingCount.ToString()));

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Let us know, whether you able to meet your requirment
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